Multifunctional chiral nematic cellulose nanocrystals/glycerol structural colored nanocomposites for intelligent responsive films, photonic inks and iridescent coatings
作者：
Xu, Mingcong;Li, Wei* ;Ma, Chunhui;Yu, Haipeng;Wu, Yiqiang;...
期刊：
Journal of Materials Chemistry C ,2018年6(20):5391-5400 ISSN：2050-7526
通讯作者：
Li, Wei;Liu, Shouxin
作者机构：
[Xu, Mingcong; Yu, Haipeng; Ma, Chunhui; Liu, Shouxin; Wang, Yonggui; Li, Wei; Chen, Zhijun; Li, Jian; Li, W; Liu, SX] Northeast Forestry Univ, Key Lab Biobased Mat Sci & Technol, Minist Educ, Hexing Rd 26, Harbin 150040, Heilongjiang, Peoples R China.;[Wu, Yiqiang] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Hunan Prov Collaborat Innovat, Ctr High Efficiency Utilizat Wood & Bamboo Resour, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Li, W; Liu, SX] N;Northeast Forestry Univ, Key Lab Biobased Mat Sci & Technol, Minist Educ, Hexing Rd 26, Harbin 150040, Heilongjiang, Peoples R China.
摘要：
Structural colored nanocomposites with photonic liquid crystal structures are desirable owing to their excellent optical performances, unique structural features and intelligent responsive behaviors. Herein, a series of cellulose nanocrystal (CNC)-based nanocomposite materials that mimic the cholesteric structural colored creatures in nature were prepared and their functional applications investigated. Multicolored, flexible and intelligent responsive iridescent films were constructed by mixing cellulose nanocrystals (CNCs) and glycerol (Gly) in different ratios. Consequently, redshifted structural colors were obtained from the increase in the helical pitch of the chiral nematic structures according to the microstructure analysis. In addition to improving the mechanical properties of the composite films, glycerol also promoted the crystallinity of the films to different degrees. The CNC/Gly20 films exhibited reversible reflection colors at different relative humidity because of the strong water absorption capability of glycerol. Furthermore, CNC/Gly composite suspensions were used as photonic inks to obtain photonic writing with unique fingerprint textures. Moreover, the CNC/Gly nanocomposites were also used to make iridescent coatings on different substrates. The incorporation of glycerol improved the compatibility between the interfaces. Thus, photonic nanocomposites from cellulose nanocrystals can potentially be developed as optical sensors, security markings and functional coatings.
语种：
英文
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浸渍后处理及干燥处理对木材树脂浸渍改性效果的影响
作者：
徐康;吕建雄;刘君良;吴义强;李贤军
期刊：
林业科学 ,2018年54(4):84-92 ISSN：1001-7488
通讯作者：
Lü, J.
作者机构：
[徐康; 吕建雄; 刘君良] 中国林业科学研究院木材工业研究所;[徐康] 浙江省林业科学研究院;[吕建雄; 吴义强; 李贤军] 中南林业科技大学材料科学与工程学院;[吕建雄; 吴义强; 李贤军] 中南林业科技大学
关键词：
低分子质量树脂;扩散;水溶性;增重率;尺寸稳定性
摘要：
【目的】探讨不同浸渍后处理方式和干燥方式对MUF树脂浸渍材增重率和尺寸稳定性的影响,为树脂浸渍改性技术提供参考和借鉴。【方法】利用5%、10%、15%和25%浓度的MUF树脂真空加压浸渍毛白杨木材,每种浓度树脂浸渍后试样首先分别进行4种方式浸渍后处理(气干处理7天、高湿度环境中平衡处理7天、树脂溶液中平衡处理7天以及不进行气干或平衡处理) ,然后分别利用2种干燥方式(直接干燥和湿干燥)进行干燥处理,干燥处理后测量不同处理条件下树脂浸渍材的增重率和容胀率,最后将素材和树脂浸渍材置于蒸馏水中常压浸渍14天,测试树脂浸渍材的抗胀率和径弦向差异湿胀程度。【结果】木材增重率与树脂浓度呈正相关关系,4种浓度树脂浸渍后试样增重率分别为9.7%、19.1%、28.4%和50.0%;不同浸渍后处理试样间的增重率差别不大;相同浸渍后处理条件下,直接干燥试样的增重率略低于湿干燥试样的增重率。树脂浸渍后,置于高湿度环境或树脂溶液中处理的试样,细胞壁容胀率较高;相同浸渍后处理条件下(除气干处理外) ,直接干燥试样的细胞壁容胀率低于湿干燥试样的细胞壁容胀率。树脂浸渍材抗胀率的变化规律与其细胞壁容胀率的变化规律基本一致。随着增重率增加,树脂浸渍材的径弦向湿胀率均降低,而其径弦向差异湿胀程度呈增加趋势,低增重率时试样的径弦向差异湿胀程度低于素材,而增重率超过30%左右时试样的径弦向差异湿胀程度高于素材。【结论】1)相同浓度树脂浸渍条件下,干燥方式对增重率的影响大于浸渍后处理方式,湿干燥处理有利于树脂在木材内部良好固着,从而获得更高的增重率; 2)细胞壁容胀率受浸渍后处理方式和干燥方式二者的共同影响,置于高湿度环境或树脂溶液中的浸渍后处理有利于树脂继续扩散到木材细胞壁,湿干燥处理有利于树脂进一步扩散到木材细胞壁中并良好固着,从而对细胞壁产生更好的容胀效应; 3)树脂浸渍材的抗胀率与细胞壁容胀率密切相关,树脂对细胞壁的容胀是树脂浸渍材尺寸稳定性提高的前提; 4)树脂浸渍材的径弦向差异湿胀程度随增重率增加而有所增加。
语种：
中文
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陈设艺术与现代居住空间的关系探究
作者：
李萍;吴义强;左迎峰
期刊：
家具与室内装饰 ,2018年(08):118-119 ISSN：1006-8260
作者机构：
湘南学院美术与设计学院,湖南郴州,423000;中南林业科技大学材料科学与工程学院,湖南长沙,410004;[吴义强; 左迎峰] 中南林业科技大学;[李萍] 湘南学院
关键词：
陈设艺术;居住空间;室内设计;关系探究
摘要：
陈设艺术是设计出理想环境的艺术;本文从现代人对居住空间室内设计的艺术境界、舒适度、品位的高要求为切入点,分别从陈设艺术与现代居住空间在设计目的、设计语言、设计形式上的统一,陈设艺术在空间和时间上对现代居住空间设计的延续,陈设艺术赋予了现代居住空间主题性、时代性、地域性的新涵义三个方面对两者的关系进行了具体分析,指出陈设艺术与现代居住空间相辅相成、不可分割.
语种：
中文
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IN SITU visualization of water adsorption in cellulose nanofiber film with micrometer spatial resolution using micro-FTIR imaging
作者：
Guo, Xin;Wu, Yiqiang*
期刊：
Journal of Wood Chemistry and Technology ,2018年38(5):361-370 ISSN：0277-3813
通讯作者：
Wu, Yiqiang
作者机构：
[Wu, Yiqiang; Guo, Xin] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Cellulose nanofiber film;relative humidity;micro-FTIR images;adsorbed water distribution;water adsorption
摘要：
Hygroscopic behavior is an inherent characteristic of nanocellulose film which strongly affects its applications. In order to gain a better understanding of water adsorption, micro-Fourier transform infrared (FTIR) imaging was used to investigate the water adsorption in cellulose nanofiber film with a spatial resolution of 20 um. Four spectral peaks at 2905 cm−1, 1428 cm−1, 1371 cm−1, and 1317 cm−1 attributed to CH and CH2 groups were used to generate 2D micro-FTIR images of cellulose distribution, and the most intense peak at 3348 cm−1 was employed to generate 2D micro-FTIR image of OH group distribution. On this basis, difference 2D micro-FTIR images of OH group distribution at different relative humidity (RH) levels demonstrated the development of adsorbed water distribution in cellulose nanofiber film during the water adsorption process. The study results confirmed that the micro-FTIR imaging was one promising tool for in situ visualization of water adsorption with micron-scale resolution. © 2018, Copyright © Taylor & Francis Group, LLC.
语种：
英文
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Fe3O4 nanoparticles embedded in cellulose nanofibre/graphite carbon hybrid aerogels as advanced negative electrodes for flexible asymmetric supercapacitors
作者：
Xia, Liaoyuan;Li, Xiangling;Wu, Xian;Huang, Le;Liao, Yu;...
期刊：
Journal of Materials Chemistry A ,2018年6(36):17378-17388 ISSN：2050-7488
通讯作者：
Wu, Yiqiang;Lu, Xihong
作者机构：
[Huang, Le; Wu, Xian; Wu, Yiqiang; Liao, Yu; Xia, Liaoyuan; Li, Xiangling; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Lu, Xihong] Sun Yat Sen Univ, Sch Chem, MOE Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.;[Lu, Xihong] Xian Univ Technol, Inst Adv Electrochem Energy, Xian 710048, Shaanxi, Peoples R China.
通讯机构：
[Wu, Yiqiang] C;[Lu, Xihong] S;[Lu, Xihong] X;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Sun Yat Sen Univ, Sch Chem, MOE Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.
摘要：
Fe 3 O 4 is a negative electrode material with great development potential, but it remains a challenge for Fe 3 O 4 -based negative electrodes to attain excellent electrochemical performance and stability simultaneously with good flexibility, which limits their practical applications in high-performance flexible asymmetric supercapacitors (ASCs). In this study, a simple and scalable bottom-up strategy is presented to prepare three-dimensional (3D) porous CNF/MWCNT/GO-hybrid aerogels (HAs) based on one-dimensional (1D) cellulose nanofibers (CNFs) and multiwalled carbon nanotubes (MWCNTs) and two-dimensional (2D) graphene oxide (GO). After in situ embedding of Fe 3 O 4 nanoparticles (∼200 nm) into the HA substrate, a high-performance flexible CNF/MWCNT/reduced-GO (RGO)/Fe 3 O 4 electrode with a large capacitance of 1193 mF cm -2 and excellent rate capability as well as high durability has been synthesized. Moreover, when using this CNF/MWCNT/RGO/Fe 3 O 4 as a negative electrode, the as-fabricated flexible ASC device exhibited a significant capacitance and energy density of 5.82 F cm -3 and 2.35 mW h cm -3 , respectively. In addition, the flexible ASC device retained more than 94.7% of its initial capacitance after 5000 charge-discharge cycles. These results indicate that the proposed strategy can provide new opportunities for researchers to rationally design and prepare flexible ASC negative electrode materials with excellent capacitive properties, which will extend the application of such materials to the domain of portable and wearable electronics. © 2018 The Royal Society of Chemistry.
语种：
英文
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Preparation and characterization of polylactic acid-g-bamboo fiber based on in-situ solid phase polymerization
作者：
Zuo, Yingfeng;Li, Wenhao;Li, Ping;Liu, Wenjie;Li, Xingong;...
期刊：
Industrial Crops and Products ,2018年123:646-653 ISSN：0926-6690
通讯作者：
Wu, Yiqiang
作者机构：
[Li, Xingong; Wu, Yiqiang; Li, Wenhao; Zuo, Yingfeng; Li, Ping; Liu, Wenjie] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Li, Xingong; Wu, Yiqiang; Zuo, Yingfeng] Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
bamboo fiber;hydrophobicity;in-situ solid phase polymerization;interfacial compatibility;polylactic acid
摘要：
This study details effort to improve the interfacial compatibility of bamboo fiber/polylactic acid composites, by attaching the molecular chain of polylactic acid (PLA) to bamboo fibers (BF). The BF was pretreated using a 1 wt% sodium hydroxide solution and the lactic acid was then grafted onto BFs using in-situ solid phase polymerization. The prepared PLA grafted BF (PLA-g-BF) was characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), the results confirmed that the grafting reaction occurred successful. The grafting ratio of the PLA-g-BF was 16.51% and the degree of substitution was 35.59%. The effect of reaction temperature and time on the degree of substitution of the PLA-g-BF was studied. The results showed that a reaction temperature of 80 °C and a reaction time of 7 h were the optimum conditions. The hydrophobicity, surface morphology, crystal structure, thermal properties and tensile properties of the PLA-g-BF were characterized. The results demonstrated that the surface and interior of BF were covered with PLA. The crystalline structure of the BF was somewhat damaged, which decreased its crystallinity and tensile strength. The grafting reaction improved the thermoplasticity and thermogravimetric performance of the PLA-g-BF. Moreover, the hydrophobicity of the PLA-g-BF was significantly increased. © 2018 Elsevier B.V.
语种：
英文
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木塑复合材料功能化改性研究进展
作者：
杨守禄;罗莎;章磊;姬宁;李丹;...
期刊：
材料导报 ,2018年32(9):3090-3098 ISSN：1005-023X
通讯作者：
Wu, Yiqiang(wuyq0506@126.com)
作者机构：
[杨守禄; 姬宁; 李丹] Guizhou Academy of Forestry, Guiyang;550005, China;[罗莎; 章磊; 吴义强] School of Materials Science and Engineering, Central South University of Forestry & Technology, Changsha;410004, China;[杨守禄] 550005, China<&wdkj&>School of Materials Science and Engineering, Central South University of Forestry & Technology, Changsha
通讯机构：
[Wu, Y.] S;School of Materials Science and Engineering, Central South University of Forestry & Technology, Changsha, China
关键词：
木塑复合材料;阻燃抑烟;耐老化耐候;抗菌;功能化改性
摘要：
木塑复合材料(WPC)是采用木质材料和塑料加工制备而成的一种绿色、环境友好新型材料,具有强度高、力学性能好、可循环使用及成本低等优势,被广泛应用于建筑材料、室内装饰材料、包装及运输材料和文化体育等领域。WPC不仅解决了废弃木质纤维材料综合利用率低及处理废弃木质纤维材料带来的环境污染等问题,而且有助于缓解废旧塑料引发的“白色污染”等重大环境问题,是废弃木质纤维和废旧塑料再生利用的一个趋势,具有广阔的市场空间和应用前景,已成为当今木质材料和塑料加工领域的研究热点之一。然而,WPC中的木质材料和塑料都是易燃物质,且燃烧产生的烟易造成人员伤亡;WPC使用过程中容易受到自然环境的影响,显著降低其物理力学性能及耐久性能;同时,由于WPC中含有木质材料,使用过程中容易遭受微生物的侵袭和破坏,导致材料变质而影响使用,甚至危害人体健康。以上缺陷严重影响其使用范围和使用寿命。近年来,研究者们致力于改善WPC的阻燃抑烟、耐老化、耐候及抗菌性能,取得了显著的成果。在实现阻燃抑烟、耐老化、耐候和抗菌功能化WPC时应用较为广泛的方法包括添加改性剂、对木质材料或塑料基体进行预处理、对WPC表面进行改性处理等。由于添加改性剂和对WPC进行表面处理具有操作简单、成本低等优势,已成为实现WPC功能化最常用的方法,可广泛用于WPC的加工。常用的阻燃抑烟剂包括聚磷酸胺(APP)、次磷酸铝(AHP)、纳米金属化合物、金属氢氧化物及含氮磷化合物等,耐老化剂、耐候剂包括受阻胺光稳定剂、紫外吸收剂、紫外线稳定剂及颜料等,抗菌剂包括纳米二氧化钛、纳米粘土、硼酸锌等。WPC表面改性处理主要是表面涂刷功能性涂料或接枝功能性试剂。目前,WPC的功能化研究集中于单一功能的增强,多功能的WPC有待进一步研究。 WPC功能化改性是拓宽其应用范围、延长使用寿命和提高安全使用性能的关键。本文综述了WPC阻燃抑烟改性、耐老化和耐候改性及抗菌改性等功能化改性的研究进展,介绍了WPC的阻燃抑烟、耐老化、耐候及抗菌性能等功能表征手段,并对其发展趋势进行了展望,提出了WPC功能化改性亟待解决的难题。
语种：
中文
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木塑复合材料在绿色建筑中的应用
作者：
杨守禄;黄安香;章磊;李丹;吴义强;...
期刊：
工程塑料应用 ,2018年46(1):123-127 ISSN：1001-3539
作者机构：
贵州省林业科学研究院, 贵阳, 550005;中南林业科技大学材料科学与工程学院, 长沙, 410004;贵州剑河园方林业投资开发有限公司, 贵州, 剑河, 556400;[杨守禄] 贵州省林业科学研究院, 贵阳, 550005 中南林业科技大学材料科学与工程学院, 长沙, 410004;[黄安香; 李丹; 姬宁] 贵州省林业科学研究院, 贵阳, 550005
关键词：
木塑复合材料;绿色建筑;建筑模板;地板;墙板;家具;应用
摘要：
对木塑复合材料(WPC)在建筑模板、地板、墙板和家具等绿色建筑领域的应用现状进行综述。同时,总结了WPC的相关指标及检验检测标准,为开发制备具有更加优秀品质的功能化WPC提供依据。WPC符合国家政策和发展规划,在绿色建筑领域具有巨大的潜在市场和广阔的应用前景。
语种：
中文
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Recent Progress in Flexible Fibrous Batteries
作者：
Xi, Zhaowei;Zhang, Xiang;Ma, Yuansheng;Zhou, Cui;Yang, Jing;...
期刊：
ChemElectroChem ,2018年5(21):3127-3137 ISSN：2196-0216
通讯作者：
Luo, Yongfeng;Chen, Daoyong
作者机构：
[Zhou, Cui; Luo, Yongfeng; Chen, Daoyong; Xi, Zhaowei; Wu, Yiqiang; Ma, Yuansheng; Yang, Jing; Li, Xianjun; Zhang, Xiang] Cent South Univ Forestry & Technol, Mat Sci & Engn Sch, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Xi, Zhaowei; Luo, Yongfeng] Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Guangdong, Peoples R China.;[Luo, Yongfeng; Chen, Daoyong] Fudan Univ, Dept Macromol Sci, State Key Lab Mol Engn Polymers, Shanghai 200433, Peoples R China.
通讯机构：
[Luo, YF; Chen, DY] C;[Luo, Yongfeng; Luo, YF; Chen, DY] F;Cent South Univ Forestry & Technol, Mat Sci & Engn Sch, Coll Sci, Changsha 410004, Hunan, Peoples R China.;Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Guangdong, Peoples R China.;Fudan Univ, Dept Macromol Sci, State Key Lab Mol Engn Polymers, Shanghai 200433, Peoples R China.
关键词：
flexible fibrous batteries;lithium-ion batteries;metal-air batteries;lithium-sulfur batteries;wearable devices
摘要：
Flexible fibrous batteries have attracted unprecedented attention, owing to the development of wearable electronic devices, which have the advantages of flexibility, weavability, and miniaturization compared with conventional bulky batteries. In this Minireview, we summarize the latest developments in flexible fibrous batteries, including lithium-ion batteries, lithium–sulfur batteries, sodium-ion batteries, and so forth. We also discuss the future directions and challenges of flexible fibrous batteries. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
语种：
英文
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A high-performance, all-textile and spirally wound asymmetric supercapacitors based on core–sheath structured MnO2 nanoribbons and cotton-derived carbon cloth
作者：
Wan, Caichao* ;Jiao, Yue;Liang, Daxin;Wu, Yiqiang* ;Li, Jian*
期刊：
Electrochimica Acta ,2018年285:262-271 ISSN：0013-4686
通讯作者：
Wan, Caichao;Wu, Yiqiang;Li, Jian
作者机构：
[Wu, Yiqiang; Wan, CC; Wan, Caichao] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Liang, Daxin; Jiao, Yue; Li, Jian] Northeast Forestry Univ, Mat Sci & Engn Coll, Harbin 150040, Heilongjiang, Peoples R China.;[Li, Jian] Northeast Forestry Univ, Key Lab Biobased Mat Sci & Technol, Minist Educ, Harbin 150040, Heilongjiang, Peoples R China.
通讯机构：
[Wan, CC; Wu, YQ] C;[Li, Jian] N;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Northeast Forestry Univ, Mat Sci & Engn Coll, Harbin 150040, Heilongjiang, Peoples R China.
关键词：
Cotton;Carbon cloth;MnO2 nanoribbons;Core-sheath structure;Spirally wound supercapacitors;In-situ redox
摘要：
An increasing emphasis on green chemistry and high-efficient utilization of natural resources has raised more demands for more facile, rapid and cost-effective approaches for preparation of energy-storage equipment. Herein, we demonstrate a simple, fast and cheap approach to create a core–sheath structured textile electrode based on cotton-derived carbon cloth (CDCC, core) and MnO2 nanoribbons (sheath). A good interface bonding between the in-situ grown MnO2 and carbon fibers of CDCC aided electron transfer. The abundant MnO2 nanostructures increased electrochemically active areas accessed by electrolyte ions and the porous CDCC acted as an electrolyte reservoir to shorten ion-diffusion path and facilitate efficient infiltration of electrolyte ions. Because of these advantages, the MnO2/CDCC electrode exhibits a high areal specific capacitance of 202 mF cm−2. In addition, the flexible electrode was assembled into an all-textile and spirally wound asymmetric supercapacitor with an outstanding electrochemical activity, like a high areal energy density of 30.1 μW h cm−2 at 0.15 mW cm−2 and an excellent capacitance retention of 87.7% after 5000 cycles. Another meritorious contribution is the synthetic strategy realizing a more direct, eco-friendly and efficient utilization way of cellulose resource, which avoided pollutions from cellulose purification or pretreatment. © 2018 Elsevier Ltd
语种：
英文
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悬铃木树皮美学图案分析及应用研究
作者：
孟陶陶;吴义强;罗建举
期刊：
林业工程学报 ,2018年3(1):141-147 ISSN：2096-1359
作者机构：
中南林业科技大学材料科学与工程学院,长沙,410004;广西大学林学院,南宁,530004;[罗建举] 广西大学;[吴义强; 孟陶陶] 中南林业科技大学
关键词：
悬铃木;树皮特征;木材美学;产品设计
摘要：
悬铃木生长快、树形优美,多用作行道和园林绿化树种。开展悬铃木树皮美学属性的研究,以进一步发掘其美学利用价值。该研究从美学角度分析了不同树龄时期悬铃木树皮的美学特征,采用不同的构图方式创作出多种形式的美学图案,并将这些美学图案应用于服装、皮包、家具等产品的研发设计,获得3种悬铃木树皮美学应用的设计作品。研究结果表明,不同时期的悬铃木树皮外观特征存在较大差异:幼龄期树皮表面平滑,均匀分布着由皮孔与树皮射线形成的灰白色斑点;老龄期树皮多为黄褐色,呈碎裂状条片层叠堆积。这两个时期的树皮图形单调,美学利用价值较低。成熟期的树皮多为绿褐色,凹凸不平的不规则形斑块构成丰富多变的图形,色彩丰富、层次分明、肌理粗犷朴实、构型奇异多样、线条流畅自然,是点、线、面的完美组合,具有很好的审美价值,可以作为美学素材应用于日用产品的美学设计。
语种：
中文
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淀粉/聚乳酸可生物降解复合材料相容界面构建研究进展
作者：
左迎峰;顾继友;张彦华;吴义强;何啸宇
期刊：
功能材料 ,2018年49(3):03054-03063,03069 ISSN：1001-9731
通讯作者：
Wu, Y.
作者机构：
[何啸宇; 左迎峰; 吴义强] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China;Key Laboratory of Bio-Based Material Science and Technology, Northeast Forestry University, Ministry of Education Harbin, 150040, China;[张彦华; 顾继友] Key Laboratory of Bio-Based Material Science and Technology, Northeast Forestry University, Ministry of Education Harbin150040, China
通讯机构：
[Wu, Y.] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
关键词：
淀粉;聚乳酸;可生物降解材料;相容界面;构建方法
摘要：
淀粉/聚乳酸(淀粉/PLA)可生物降解复合材料的开发能够缓解塑料工业对石油资源的依赖性和从根本上解决传统塑料所带来的“白色污染”问题。对淀粉与PLA之间的相容界面性进行构建,可以有效提高淀粉/ PLA复合材料的机械性能、耐水性能和熔融加工性能等。概述了淀粉/PLA的界面特性和构建机理,从淀粉塑化改性、增容剂改性、淀粉疏水改性和PLA亲水改性4个方面综述了淀粉/PLA复合材料相容界面构建进展。针对淀粉/PLA复合材料在构建方法和构建机理等方面研究的不足,提出了进一步开展研究的建议。
语种：
中文
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三聚氰胺/纳米TiO2联合改性脲醛树脂胶粘剂研究
作者：
刘文杰;刘明;李新功;李贤军;吴义强;...
期刊：
中国胶粘剂 ,2018年27(10):10-14 ISSN：1004-2849
作者机构：
中南林业科技大学材料科学与工程学院,湖南长沙,410004;[李贤军; 卿彦; 刘文杰; 吴义强; 李新功; 刘明; 左迎峰] 中南林业科技大学
关键词：
三聚氰胺;纳米TiO2;脲醛树脂;游离甲醛;热性能
摘要：
以甲醛、尿素为原料,纳米TiO2和三聚氰胺为改性剂,采用“碱-酸-碱”的合成工艺合成脲醛树脂,并对三聚氰胺/纳米TiO2联合改性脲醛树脂工艺进行优化。研究结果表明：当纳米TiO2用量不变,脲醛树脂的黏度、固含量、胶合强度随三聚氰胺加入量增加而增大,而固化时间和游离甲醛含量则呈现出相反的变化趋势;添加w（三聚氰胺）=1.5%（相对于尿素添加质量而言）改性后的脲醛树脂游离甲醛含量为0.41%,耐水胶合强度为1.25 MPa,对不同配比的甲醛/尿素（F/U）脲醛树脂,三聚氰胺/纳米TiO2联合改性性能相似;改性后的脲醛树脂及纳米TiO2能够均匀分布于木材表面,以保证较好的胶合强度和联合改性效果。
语种：
中文
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竹纤维/聚乳酸可降解复合材料的增塑改性
作者：
左迎峰;李文豪;李萍;赵星;李新功;...
期刊：
林业工程学报 ,2018年3(1):77-82 ISSN：2096-1359
作者机构：
中南林业科技大学材料科学与工程学院,长沙,410004;[赵星; 李文豪; 吴义强; 李新功; 李萍; 左迎峰] 中南林业科技大学
关键词：
竹纤维;聚乳酸;复合增塑;界面相容性;机械性能;耐水性能
摘要：
以竹纤维和聚乳酸（PLA）为原料,乙二醇、甘油、聚乙二醇400、尿素、甲酰胺和柠檬酸酯为增塑剂,通过熔融共混法制备了竹纤维/PLA可降解复合材料。探讨了一元增塑、二元复合增塑和三元复合增塑对竹纤维/PLA复合材料拉伸强度、抗弯强度、断裂伸长率和耐水性能的影响。试验结果表明,不同增塑剂对竹纤维/PLA复合材料的增塑效果不同,甘油增塑复合材料的拉伸强度和抗弯强度最大,甲酰胺增塑复合材料的断裂伸长率最大,柠檬酸酯增塑复合材料的耐水性能最优。二元复合增塑具有协同增塑效果,甘油/柠檬酸脂复合增塑竹纤维/PLA复合材料的拉伸强度和抗弯强度最大,乙二醇/甲酰胺复合增塑竹纤维/PLA复合材料的断裂伸长率最大,乙二醇/柠檬酸酯复合增塑竹纤维/PLA复合材料的耐水性能最优。三元复合增塑在获得较好相容性的同时,复合材料的韧性明显提高,甘油/柠檬酸酯/乙二醇、甘油/柠檬酸脂/甲酰胺复合增塑竹纤维/PLA复合材料不仅具有较高的强度,且断裂伸长率和耐水性能均较好,优于一元和二元增塑效果。
语种：
中文
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原位固相聚合法制备聚乳酸-g-竹纤维
作者：
左迎峰;何啸宇;李萍;刘文杰;李文豪;...
期刊：
高分子材料科学与工程 ,2018年34(8):142-148 ISSN：1000-7555
通讯作者：
Wu, Yiqiang(wuyq0506@126.com)
作者机构：
[左迎峰; 何啸宇; 李萍; 刘文杰; 李文豪; 郭鑫; 吴义强] School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[左迎峰; 何啸宇; 李萍; 刘文杰; 李文豪; 郭鑫; 吴义强] 410004, China
通讯机构：
[Wu, Y.] S;School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
关键词：
竹纤维;聚乳酸;原位固相聚合;取代度;疏水性能
摘要：
以竹纤维为原料,乳酸为接枝单体,采用固相聚合法制备了聚乳酸接枝竹纤维(PLA-g-BF).傅里叶变换红外光谱表征发现乳酸与竹纤维通过固相聚合法成功发生了接枝反应.研究了乳酸/竹纤维质量比、反应温度和反应时间对PLA-g-BF PLA取代基含量和取代度的影响,采用扫描电子显微镜(SEM)、接触角测试仪(CA)对PLA-g-BF进行了表征,并测试了120 h内的吸水率.结果表明,乳酸/竹纤维质量比为2∶1,反应温度为80℃,反应时间为7h时,PLA-g-BF的PLA取代基含量和取代度达到最大值,分别为17.71％和38.74％.SEM测试显示竹纤维细胞壁上大量的纹孔被接枝物填充,且出现了明显的层状附着物.接触角和吸水率分析表明,通过固相聚合法将乳酸接枝到竹纤维上有效提高了竹纤维的疏水性能.
语种：
中文
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In situ micro-FTIR observation of molecular association of adsorbed water with heat-treated wood
作者：
Guo, Xin;Wu, Yiqiang* ;Yan, Ning
期刊：
Wood Science and Technology ,2018年52(4):971-985 ISSN：0043-7719
通讯作者：
Wu, Yiqiang
作者机构：
[Wu, Yiqiang; Guo, Xin] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Guo, Xin] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Yan, Ning] Univ Toronto, Fac Forestry, 33 Willcocks St, Toronto, ON M5S 3B3, Canada.
通讯机构：
[Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
摘要：
Heat modification is an effective method of reducing the hygroscopicity of wood. To gain a detailed understanding of water adsorption mechanism of heat-treated wood, the molecular interaction between the adsorbed water and heat-treated wood was studied via micro-FTIR spectroscopy. The micro-FTIR spectra of heat-treated wood exhibited a typical change in the chemical groups resulting from the heat treatment. In addition, the micro-FTIR spectra at different relative humidity levels confirmed the chemical sites at which the heat-treated wood adsorbed the water. A component band analysis of these difference spectra revealed three component peaks that were assigned to strongly, moderately, and weakly hydrogen-bonded water, respectively. Based on this variation of these three types of adsorbed water, the water adsorption process of heat-treated wood was divided into three different sections. Furthermore, the structure of the water adsorbed in these three sections was demonstrated. The results of this study provide a valuable insight into the state of water present in heat-treated wood.
语种：
英文
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Preparation and Characterization of Esterified Bamboo Flour by an In Situ Solid Phase Method
作者：
Geng, Yaqi;Pei, Xiaohan;He, Xiaoyu;Li, Ping;Wu, Yiqiang;...
期刊：
Polymers ,2018年10(8):920- ISSN：2073-4360
通讯作者：
Zuo, Yingfeng
作者机构：
[Wu, Yiqiang; Li, Ping; Zuo, Yingfeng; Geng, Yaqi; Pei, Xiaohan; He, Xiaoyu] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Wu, Yiqiang; Zuo, Yingfeng] Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Zuo, Yingfeng] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China.
关键词：
bamboo flour;in situ solid phase method;esterification modification;substituting degree;hydrophobicity
摘要：
Bamboo plastic composites have become a hot research topic and a key focus of research. However, many strong, polar, hydrophilic hydroxyl groups in bamboo flour (BF) results in poor interfacial compatibility between BF and hydrophobic polymers. Maleic anhydride-esterified (MAH-e-BF) and lactic acid-esterified bamboo flour (LA-e-BF) were prepared while using an in situ solid-phase esterification method with BF as the raw material and maleic anhydride or lactic acid as the esterifying agent. Fourier transform infrared spectroscopy results confirmed that BF esterification with maleic anhydride and lactic acid was successful, with the esterification degrees of MAH-e-BF and LA-e-BF at 21.04 ± 0.23% and 14.28 ± 0.17%, respectively. Esterified BF was characterized by scanning electron microscopy, contact angle testing, X-ray diffractometry, and thermogravimetric analysis. The results demonstrated that esterified BF surfaces were covered with graft polymer and the surface roughness and bonding degree of MAH-e-BF clearly larger than those of LA-e-BF. The hydrophobicity of esterified BF was significantly higher than BF and the hydrophobicity of MAH-e-BF was better than LA-e-BF. The crystalline structure of esterified BF showed some damage, while MAH-e-BF exhibited a greater decrease in crystallinity than LA-e-BF. Overall, the esterification reaction improved BF thermoplasticity, with the thermoplasticity of MAH-e-BF appearing to be better than LA-e-BF. © 2018 by the authors.
语种：
英文
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Preparation and characterization of fire retardant straw/magnesium cement composites with an organic-inorganic network structure
作者：
Zuo, Yingfeng;Xiao, Junhua;Wang, Jian;Liu, Wenjie;Li, Xingong;...
期刊：
Construction and Building Materials ,2018年171:404-413 ISSN：0950-0618
通讯作者：
Wu, Yiqiang
作者机构：
[Xiao, Junhua; Wang, Jian; Li, Xingong; Wu, Yiqiang; Zuo, Yingfeng; Liu, Wenjie] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Fire-retardant;Magnesium cement;Mechanical property;Organic-inorganic network structure;Silicone-acrylate emulsion;Straw;Water resistance
摘要：
Magnesium cement product is an excellent fire-retardant material that has been extensively used in the building materials industry. But their strength and ability to withstand humid conditions still yet to be improved. The silicone-acrylate emulsion was utilized in this study to improve the water resistance and mechanical strength of the straw-magnesium cement (SMC) composites. The properties improvement mechanism and fire-retardant performances was also analyzed. For the SMC composites containing 6% silicone-acrylate emulsion, the modulus of rupture, internal bond strength and the strength retention coefficient after immersion have all increased significantly. In contrast, the thickness swelling, water absorption decreased dramatically. The analysis results showed that an organic-inorganic network structure was formed in the novel magnesium cement, which enhanced the integrity of the material and played a role in protecting the crystals against hydrolysis. With the enhanced water resistance and mechanical strength, the novel SMC composites broadened the use in humid environments and increased the service life. Their excellent fire-resistant properties make the novel SMC composites an ideal candidate for use in public venues. © 2018 Elsevier Ltd
语种：
英文
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A Geologic Architecture System-Inspired Micro-/Nano-Heterostructure Design for High-Performance Energy Storage
作者：
Wan, Caichao* ;Jiao, Yue;Liang, Daxin;Wu, Yiqiang* ;Li, Jian*
期刊：
Advanced Energy Materials ,2018年8(33):1802388-null ISSN：1614-6832
通讯作者：
Wan, Caichao;Wu, Yiqiang;Li, Jian
作者机构：
[Wu, Yiqiang; Wan, CC; Wan, Caichao] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Liang, Daxin; Jiao, Yue; Li, Jian] Northwest Forestry Univ, Mat Sci & Engn Coll, Harbin 150040, Heilongjiang, Peoples R China.
通讯机构：
[Wan, CC; Wu, YQ] C;[Li, Jian] N;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Northwest Forestry Univ, Mat Sci & Engn Coll, Harbin 150040, Heilongjiang, Peoples R China.
关键词：
functional materials;heterostructure;nature-inspired design;supercapacitors
摘要：
Nature-inspired strategies are extensively proposed as novel and effective routines to address challenges for eco-friendly and high-performance energy storage devices with high energy/power density and long cycling life. Inspired by synergistic functions and integrated form of a geologic architecture system (i.e., ground–mountain–vegetation), here a novel and hierarchical cellulose-supported Co@Co(OH)2 heterostructure based on a facile combined method of magnetron sputtering and electrooxidation is created. Thanks to the synergistic effects of this multiscale structure (i.e., the storage capacity of cellulose substrate (ground) for electrolyte ions, electron superhighway supplied by interlayered metallic Co (mountain), and ultrahigh electrochemical activity and mechanical stability of in situ grown and quasi-honeycomb Co(OH)2 (vegetation) with large surface area), the composite displays a high specific capacitance (642 mF cm−2/958 F g−1 at 2 mA cm−2), excellent rate performance, and outstanding cycling stability (only 2.1% loss after 10 000 cycles), which are significantly superior to those of other microstructure designs of Co(OH)2-based electrodes. Also, the assembled asymmetric supercapacitor exhibits highly competitive energy/power density (166 µW h cm−2 at 1.5 mW cm−2) and excellent cycling stability. Combined with the outstanding electrochemical properties, facile synthesis technology, environmental friendliness, and low cost, this ingenious nature-inspired composite holds great promise for green high-performance energy storage devices. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
语种：
英文
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Hydrothermal Synthesis of Cellulose Nanocrystal-Grafted-Acrylic Acid Aerogels with Superabsorbent Properties
作者：
Liu, Xuehua;Yang, Rue;Xu, Mincong;Ma, Chunhui;Li, Wei* ;...
期刊：
Polymers ,2018年10(10):1168- ISSN：2073-4360
通讯作者：
Li, Wei;Liu, Shouxin
作者机构：
[Ma, Chunhui; Liu, Shouxin; Yin, Yu; Xu, Mincong; Li, Wei; Liu, Xuehua; Li, Jian; Li, W; Liu, SX] Northeast Forestry Univ, Minist Educ, Key Lab Biobased Mat Sci & Technol, Hexing Rd 26, Harbin 150040, Heilongjiang, Peoples R China.;[Yang, Rue; Huang, Qiongtao; Li, Wei] Yihua Lifestyle Technol Co Ltd, Postdoctoral Res Ctr, Shantou 515834, Peoples R China.;[Wu, Yiqiang; Li, Wei] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Li, W; Liu, SX] N;[Li, Wei] Y;[Li, Wei] C;Northeast Forestry Univ, Minist Educ, Key Lab Biobased Mat Sci & Technol, Hexing Rd 26, Harbin 150040, Heilongjiang, Peoples R China.;Yihua Lifestyle Technol Co Ltd, Postdoctoral Res Ctr, Shantou 515834, Peoples R China.
关键词：
cellulose nanocrystals;hydrothermal;aerogels;superabsorbent
摘要：
In this work, we applied a fast and simple method to synthesize cellulose nanocrystal (CNC) aerogels, via a hydrothermal strategy followed by freeze drying. The characteristics and morphology of the obtained CNC-g-AA aerogels were affected by the hydrothermal treatment time, volume of added AA (acrylic acid), and the mass fraction of the CNCs. The formation mechanism of the aerogels involved free radical graft copolymerization of AA and CNCs with the cross-linker N,N′-methylene bis(acrylamide) (MBA) during the hydrothermal process. The swelling ratio of the CNC-g-AA aerogels was as high as 495:1, which is considerably greater than that of other polysaccharide-g-AA aerogels systems. Moreover, the CNC-g-AA aerogels exhibited an excellent methyl blue (MB) adsorption capacity and the ability to undergo rapid desorption/regeneration. The maximum adsorption capacity of the CNC-g-AA aerogels for MB was greater than 400 mg/g. Excellent regeneration performance further indicates the promise of our CNC-g-AA aerogels as an adsorbent for applications in environmental remediation.
语种：
英文
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