Effect of heat treatment on dimensional stability of phenolic resin impregnated poplar wood
作者：
徐康;吕建雄;李贤军;吴义强
期刊：
北京林业大学学报 ,2015年37(9):70-77 ISSN：1000-1522
通讯作者：
Lü, J.-X.
作者机构：
[Lü J.-X.] Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, 100091, China;[吴义强; 李贤军] Material Science and Engineering School of Central South University of Forestry and Technology, Changsha, 410004, China;[徐康] Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, 100091, China, Material Science and Engineering School of Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
[Lü, J.-X.] R;Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, China
会议名称：
第六届全国生物质材料科学与技术学术研讨会
会议时间：
2015-10-18
会议地点：
南京
会议论文集名称：
第六届全国生物质材料科学与技术学术研讨会论文集
关键词：
杨木;高温热处理;PF浸渍材;尺寸稳定性
摘要：
为研究高温热处理对杨木PF浸渍材尺寸稳定性的影响,对速生杨木素材和PF浸渍材进行高温热处理,系统研究杨木素材、PF浸渍材、热处理材和PF浸渍-热处理材的吸水性、线性(径向和弦向)和体积吸水膨胀率、吸湿含水率、表面润湿性. 结果表明:高温热处理可显著降低材料的吸水性、吸水膨胀率、吸湿含水率、表面润湿性,提高尺寸稳定性. 相比于素材,浸水8 d后,PF浸渍材吸水量降低了17. 37%,热处理材最高降低了63. 8%,PF浸渍-热处理材最高降低了74. 7%;PF浸渍材径向、弦向及体积吸水膨胀率分别降低14. 71%、36. 93%、30. 19%,热处理材最高分别降低了64. 99%、74. 94%、72. 33%,PF浸渍-热处理材最高分别降低94. 4%、90. 61%、91. 37%;PF浸渍材吸湿含水率降低了11. 14%,热处理材最高降低了55. 57%,PF浸渍-热处理材最高降低了60. 62%. 与素材相比, PF浸渍材的表面接触角相差不大,热处理材最高提高了143. 7%,PF浸渍- 热处理材最高提高了139. 4%,后2种木材的表面润湿性明显降低. 相同热处理条件下,PF浸渍-热处理材尺寸稳定性更优异. 红外光谱图中,PF浸渍材羟基、羰基和羧基吸收峰减弱、苯环碳骨架振动加强,热处理后羟基和乙酰基吸收峰减弱,表明PF浸渍处理和热处理对木材亲水性基团的减少和尺寸稳定性提高均有贡献,作为一种联合改性技术对于速生材尺寸稳定性的提高和开发利用具有实际意义.
语种：
中文
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杨木单板增强秸秆板制备工艺
作者：
左迎峰;吴义强;吕建雄;朱晓丹
期刊：
木材科学与技术 ,2015年29(06):18-21 ISSN：2096-9694
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;中南林业科技大学材料科学与工程学院,湖南长沙410004;中国林科院木材工业研究所,北京100091;[朱晓丹; 吴义强; 吕建雄; 左迎峰] 中南林业科技大学
关键词：
无机胶黏剂;单板;秸秆板;增强
摘要：
采用自主研发的无机胶黏剂,制备杨木单板增强秸秆板,进行了单因素试验和正交优化工艺试验。结果表明,涂胶量和热压工艺对试板的静曲强度、弹性模量、表面结合强度、浸渍剥离长度影响明显;采用优化工艺制备的复合板,其静曲强度,弹性模量、表面胶合强度和浸渍剥离长度,分别达到GB/T 18103-2013《实木复合地板》和GB/T15104-2006《装饰单板贴面人造板》要求。
语种：
中文
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The Effect of Thermal Treatment on Color and Dimensional Stability of Eucalyptus
作者：
Cheng, X. Y.* ;Huang, Q. T.;Li, X. J.;Sun, H. N.;Wu, Y. Q.;...
作者机构：
[Wu, Y. Q.; Li, X. J.; Liu, Y.; Cheng, X. Y.] Cent South Univ Forestry & Technol, Mat Sci & Engn Coll, Changsha, Hunan, Peoples R China.;[Huang, Q. T.; Sun, H. N.] Yihua Enterprise Grp Co LTD, Yihua Timber Ind, Shantou, Guangdong, Peoples R China.
会议名称：
2015 International Conference on Automation,Mechanical and Electrical Engineering(AMEE 2015)
会议时间：
2015-01-01
会议地点：
Phuket,Thailand
会议主办单位：
[Cheng, X. Y.;Li, X. J.;Wu, Y. Q.;Liu, Y.] Cent South Univ Forestry & Technol, Mat Sci & Engn Coll, Changsha, Hunan, Peoples R China.^[Huang, Q. T.;Sun, H. N.] Yihua Enterprise Grp Co LTD, Yihua Timber Ind, Shantou, Guangdong, Peoples R China.
关键词：
Eucalyptus (Eucalyptus grandisxE. urophylla);thermal treatment;color;moisture adsorption performance;dimensional stability
摘要：
In this study, the effect of thermal treatment on color, moisture absorption performance, and dimensional stability of Eucalyptus(Eucalyptus grandis×E. urophylla) was investigated. Wood specimens were
语种：
英文
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Climatic signals in wood property variables of picea crassifolia
作者：
Lu, Jianxiong* ;Xu, Jinmei;Wu, Yiqiang;Li, Xianjun;Evans, Robert;...
期刊：
Wood and Fiber Science ,2015年47(2):131-140 ISSN：0735-6161
通讯作者：
Lu, Jianxiong
作者机构：
[Lu, Jianxiong; Li, Xianjun] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.;[Xu, Jinmei; Lu, Jianxiong] Chinese Acad Forestry, Res Inst Wood Ind, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China.;[Evans, Robert] CSIRO Mat Sci & Engn, Clayton, Vic 3169, Australia.;[Downes, Geoffrey M.] CSIRO Ecosyst Sci, Hobart, Tas 7001, Australia.;[Downes, Geoffrey M.] CRC Forestry, Hobart, Tas 7001, Australia.
通讯机构：
[Lu, Jianxiong] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.
关键词：
Wood property;cell characteristics;microfibril angle;wood density;treering;dendroclimatology
摘要：
Little attention has been given to climatic signals in wood properties. In this study, ring width (RW), annual average microfibril angle (MFA), annual average tracheid radial diameter (TRD), and annual average density (DEN), as the annual and intra-annual wood property variables, were measured at high resolution by SilviScan-3 on dated Picea crassifolia trees. Dendroclimatological methods were used to analyze climatic signals registered in wood property variables. RW, MFA, and TRD negatively correlated with temperature and positively correlated with precipitation in the growing season, whereas the reverse was true for DEN. Climatic signals recorded in the earlywood were similar to those measured for the full width of the annual rings. Climatic signals recorded in latewood were very weak except for latewood MFA. This study showed that wood property variables could be extensive resources for learning more about the influences of climate on tree growth and how trees adapt to ongoing climate change.
语种：
英文
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Self-assembled optically transparent cellulose nanofibril films: effect of nanofibril morphology and drying procedure
作者：
Qing, Yan;Sabo, Ronald* ;Wu, Yiqiang;Zhu, J. Y.;Cai, Zhiyong
期刊：
Cellulose ,2015年22(2):1091-1102 ISSN：0969-0239
通讯作者：
Sabo, Ronald
作者机构：
[Wu, Yiqiang; Qing, Yan] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Sabo, Ronald; Zhu, J. Y.; Cai, Zhiyong; Qing, Yan] USDA, Forest Prod Lab, Madison, WI 53726 USA.;[Sabo, Ronald] USDA, Forest Prod Lab, 1 Gifford Pinchot Dr, Madison, WI 53726 USA.
通讯机构：
[Sabo, Ronald] U;USDA, Forest Prod Lab, 1 Gifford Pinchot Dr, Madison, WI 53726 USA.
关键词：
Cellulose nanofibrils;Self-assembled films;Filtration;Freeze-drying;Casting;Mechanical and optical properties
摘要：
Cellulose nanofibril (CNF) films currently provide great opportunity in many applications with advantages of excellent mechanical strength, high light transmittance, and good barrier properties. However, processes for preparing CNFs are typically tedious and vary, along with their properties. Here, five preparation methods using various combinations of filtration, freeze-drying, and casting are applied to produce CNF films, and their major properties are compared. Three different types of CNFs having a range of fiber diameter and aspect ratio were examined using each of these five preparation methods. Because of limited hydrogen bonds and nanofibril arrangement, the freeze-dried CNF films displayed reduced mechanical strength and light transmittance compared to the other methods, although freeze-drying was relatively fast. Some effects of film production methods on measured crystallinity were also observed with freeze-dried samples having lower crystallinity than films similarly produced by filtration and drying. Free-standing CNF films produced by casting at room temperature required long times and mold growth was sometimes observed, but cast films made from 2,2,6,6-tetramethylpiperidine-1-oxyl radical-oxidized CNFs had the highest light transmittance of any samples. Filtration of CNF suspensions followed by air- or oven-drying produced films with minimal defects, high mechanical strength, and good light transmittance with relatively little effort. Therefore, this filtration procedure is recommended for producing CNF films. © 2015, Springer Science+Business Media Dordrecht (outside the USA).
语种：
英文
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纳米纤维素的制备及其对水性聚氨酯的增强作用
作者：
徐晨浩;王洁;黄自知;胡云楚;袁利萍;...
期刊：
机械 ,2015年45(6):52-56 ISSN：1006-0316
作者机构：
中南林业科技大学理学院,湖南长沙,410004;中南林业科技大学材料科学与工程学院,湖南长沙,410004;[袁利萍; 卿彦; 黄自知; 吴义强; 胡云楚; 袁光明; 王洁; 徐晨浩] 中南林业科技大学
关键词：
纳米纤维素;形貌尺寸;水性聚氨酯;增强作用
摘要：
水性聚氨酯以水代替有机溶剂作为分散介质,在带来环境优势的同时降低了力学性能.在探索具有不同微观形貌和尺寸特征纳米纤维素制备技术基础上,研究纳米纤维素形态尺寸对水性聚氨酯的增强作用和机理.结果表明,联合使用机械剪切法和硫酸水解法,调节反应温度和反应时间等工艺条件,可以获得具有不同微观形貌和长度特征的纳米纤维素.当硫酸浓度60％、水解温度55℃、水解时间120 min时,制得纤维素平均长度为0.20 μm,长度在10—100 nm范围内的纳米纤维素达到34％,平均直径约为20 nm,平均长径比为10∶1,纤维呈光滑细长飞梭状.乳化预聚体法制备的纤维素/水性聚氨酯乳液具有较好的储存稳定性,纤维素/水性聚氨酯复合薄膜硬度大幅度提高,拉伸强度达到25.41 MPa,相对于纯水性聚氨酯薄膜强度提高346％.
语种：
中文
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Cellulose nanoparticles as modifiers for rheology and fluid loss in bentonite water-based fluids
作者：
Li, Mei-Chun;Wu, Qinglin* ;Song, Kunlin;Qing, Yan;Wu, Yiqiang
期刊：
ACS Applied Materials & Interfaces ,2015年7(8):5009-5016 ISSN：1944-8244
通讯作者：
Wu, Qinglin
作者机构：
[Song, Kunlin; Li, Mei-Chun; Wu, Qinglin] Louisiana State Univ, AgCtr, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA.;[Wu, Yiqiang; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Qinglin] L;Louisiana State Univ, AgCtr, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA.
关键词：
microfibrillated cellulose;cellulose nanocrystals;bentonite;water-based drilling fluids;rheology;filtration loss
摘要：
Rheological and filtration characteristics of drilling fluids are considered as two critical aspects to ensure the success of a drilling operation. This research demonstrates the effectiveness of cellulose nanoparticles (CNPs), including microfibrillated cellulose (MFC) and cellulose nanocrystals (CNCs) in enhancing the rheological and filtration performances of bentonite (BT) water-based drilling fluids (WDFs). CNCs were isolated from MFC through sulfuric acid hydrolysis. In comparison with MFC, the resultant CNCs had much smaller dimensions, more negative surface charge, higher stability in aqueous solutions, lower viscosity, and less evident shear thinning behavior. These differences resulted in the distinctive microstructures between MFC/BT- and CNC/BT-WDFs. A typical "core-shell" structure was created in CNC/BT-WDFs due to the strong surface interactions among BT layers, CNCs, and immobilized water molecules. However, a similar structure was not formed in MFC/BT-WDFs. As a result, CNC/BT-WDFs had superior rheological properties, higher temperature stability, less fluid loss volume, and thinner filter cakes than BT and MFC/BT-WDFs. Moreover, the presence of polyanionic cellulose (PAC) further improved the rheological and filtration performances of CNC/BT-WDFs, suggesting a synergistic effect between PAC and CNCs. © 2015 American Chemical Society.
语种：
英文
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Poly(vinylidene fluoride)/cellulose nanocrystals composites: rheological, hydrophilicity, thermal and mechanical properties
作者：
Zhang, Zhen;Wu, Qinglin* ;Song, Kunlin;Lei, Tingzhou;Wu, Yiqiang
期刊：
Cellulose ,2015年22(4):2431-2441 ISSN：0969-0239
通讯作者：
Wu, Qinglin
作者机构：
[Song, Kunlin; Zhang, Zhen; Wu, Qinglin] Louisiana State Univ, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA.;[Lei, Tingzhou] Key Biomass Energy Lab Henan Prov, Zhengzhou 450008, Henan, Peoples R China.;[Wu, Yiqiang] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Qinglin] L;Louisiana State Univ, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA.
关键词：
Poly(vinylidene fluoride);Cellulose nanocrystals;Reinforcement;Hydrophilicity;Thermal properties;Rheological properties
摘要：
Cellulose nanocrystals (CNCs) were used to improve the performance of poly(vinylidene fluoride) (PVDF), and thecomposite properties were characterized. The results showed that the prepared nanocomposites displayed the increases in mechanical properties. In particular, with the incorporation of 6wt% CNCs, increases in tensile strength and dynamicstorage modulus were observed. For hydrophilicity, the water contact angle decreased from 90° to 77° with the incorporation of only 3wt% CNCs, indicating improved hydrophilicity. Addition of CNCs to PVDF also helped improve its thermal stability and crystallinity. It was suggested that CNCs played a nucleating role in the crystallization of PVDF, which was supported by the smaller size of PVDF spherulite observed from scanning electron microscopy analysis. Rheological results indicated that incorporation of CNCs also increased both melt storage modulus and shear viscosity of composites. Overall, our present work demonstrates that CNCs can provide PVDF with simultaneously improved properties. © 2015, Springer Science+Business Media Dordrecht.
语种：
英文
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Facile preparation of optically transparent and hydrophobic cellulose nanofibril composite films
作者：
Qing, Yan;Cai, Zhiyong;Wu, Yiqiang* ;Yao, Chunhua;Wu, Qinglin;...
期刊：
Industrial Crops and Products ,2015年77:13-20 ISSN：0926-6690
通讯作者：
Wu, Yiqiang
作者机构：
[Wu, Yiqiang; Yao, Chunhua; Wu, Qinglin; Li, Xianjun; Qing, Yan] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Yao, Chunhua; Cai, Zhiyong] US Forest Serv, USDA, Forest Prod Lab, Madison, WI 53726 USA.
通讯机构：
[Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Cellulose nanofibrils;Nanocomposite;Static and dynamic mechanical properties;Visible light transmittance;Wetting and water contact angle
摘要：
Cellulose nanofibril (CNF) and epoxy nanocomposites with high visible light transmittance and low water sensitivity were manufactured by laminating thin layers of epoxy resin onto CNF films prepared through, pressurized filtration in combination with oven drying. Scanning Electron Microscopy (SEM) studies suggest that the resin component bonded to the CNF substrate well. Atomic Force Microscopy (AFM) observation reveals that the resin lamination led to smoother film surface, which helped enhance UV-vis transmittance. The addition of epoxy resin had little effect on the static and dynamic mechanical strength. However, crystalline and interconnected CNFs significantly reduced the loss factor and shifted the glass transition of composite to a high temperature. Compared to pure CNF films, the CNF/epoxy composites showed a 20% improved transparence in the visible light range. The CNF/epoxy composites demonstrated a sufficient water resistance. This composite film could be considered as a potential substrate material in the application of flexible electronics substrates. © 2015 Elsevier B.V.
语种：
英文
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Study on the effect of organic additives and inorganic fillers on properties of sodium silicate wood adhesive modified by polyvinyl alcohol
作者：
Liu, Xiaomei;Wu, Yiqiang* ;Zhang, Xinli;Zuo, Yingfeng
期刊：
BIORESOURCES ,2015年10(1):1528-1542 ISSN：1930-2126
通讯作者：
Wu, Yiqiang
作者机构：
[Zhang, Xinli; Wu, Yiqiang; Liu, Xiaomei; Zuo, Yingfeng] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Yiqiang] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Bonding property;Inorganic fillers;Organic additives;Thermal analysis;Water resistance
摘要：
To enhance the properties of sodium silicate wood adhesive modified by PVOH (polyvinyl alcohol), different organic additives (compound A) and inorganic fillers (compound B) were added into the system. Their effects on the thermal stability and molecular structure of the composite adhesive were investigated by scanning electron microscopy (SEM), spectroscopic analysis (FT-IR), differential scanning calorimetry (DSC), and thermo- gravimetric analysis (TGA). The results showed that when the compound A consisting of amino acid, TEOS (Tetraethyl orthosilicate), sodium dodecyl sulfate with the mass ratio of 5:3:3 and B consisting of 50% active magnesium oxide and 50% nano-silica were added into the cross-linked sodium silicate adhesive system with the ratio of 90:3, the bonding and water resistance properties were improved by 97.6% and 46.7%, or 13.7% and 36% relative to pure and cross-linked sodium silicate, respectively. The addition of organic additives and inorganic fillers had a good effect on both the bonding strength and thermal stability of sodium silicate wood adhesive modified by PVOH.
语种：
英文
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纳米材料与纳米技术在功能性木材中的应用
作者：
田翠花;吴义强;罗莎;卿彦;刘明;...
期刊：
世界林业研究 ,2015年28(1):61-66 ISSN：1001-4241
作者机构：
[田翠花; 吴义强; 罗莎; 卿彦; 刘明; 朱晓丹] 中南林业科技大学材料科学与工程学院
关键词：
纳米材料;纳米技术;木材;功能化修饰
摘要：
木材的功能化修饰是提高和改善其性能的有效途径,利用纳米材料与纳米技术所具有的特性和功能来改性木材,可以获得新型功能化的木基纳米复合材料。文中总结了纳米材料、纳米合成技术、纳米表征技术以及纳米仿生智能构筑技术在木材功能性改良中的应用情况,展望了纳米材料与纳米技术在功能性木材研究领域的发展趋势,旨在为木材的功能化修饰研究提供参考。
语种：
中文
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Research on Necessary Factors for Cultivation of Innovative Talents
作者：
Zheng, Xia;Li, Xingong;Pan, Yage;Fu, Bin;Wu, Yiqiang
作者机构：
[Zheng, Xia; Li, Xingong; Pan, Yage; Fu, Bin; Wu, Yiqiang] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.
会议名称：
International Conference on Education and Management with Information Technology (EMIT)
会议时间：
APR 25-26, 2015
会议地点：
Wuhan, PEOPLES R CHINA
摘要：
In this paper, the connotation of innovation education is discussed, the necessity of innovative education in our country and the existing problems in innovative education are analyzed, three necessary factors for cultivation of innovative talents: innovation of education form, innovation of education method and curriculum innovation are introduced, and the connotation and implementation strategy of innovation of education form, innovation of education method and curriculum innovation are expounded, in order to provide certain theoretical support for cultivation of innovative talents in higher education in our country.
语种：
英文
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低分子量酚醛树脂浸渍人工林木材研究进展
作者：
左迎峰;吴义强;张新荔;李新功
期刊：
材料导报 ,2015年29(12A):7-11 ISSN：1005-023X
作者机构：
[左迎峰; 吴义强; 张新荔; 李新功] 中南林业科技大学材料科学与工程学院
关键词：
人工林木材;低分子量酚醛树脂;浸渍改性;浸渍工艺;发展趋势
摘要：
人工林木材的大量利用缓解了木材供需矛盾,对一些材质较差的人工林木材的改性成为迫切需要解决的重点课题。采用低分子量的酚醛树脂对人工林木材进行浸渍改性,可以使人工林木材的各项物理力学性能得到不同程度的改善,该技术可大大拓宽许多人工速生林木材的应用范围,实现其高附加值利用,是一种非常有前景的木材改性技术。概述了人工林木材浸渍改性的机理,酚醛树脂性能、浸渍工艺和木材材性对浸渍的影响,并提出了存在的问题和今后研究的趋势,为人工林木材浸渍改性的进一步研究提供参考。
语种：
中文
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甘油/甲酰胺复合增塑淀粉/聚乳酸复合材料
作者：
左迎峰;顾继友;张彦华;吴义强
期刊：
材料导报 ,2015年(01):242-244 ISSN：1005-023X
作者机构：
1. 中南林业科技大学材料科学与工程学院;2. 东北林业大学材料科学与工程学院
关键词：
玉米淀粉;聚乳酸;复合增塑剂;相容性
摘要：
采用甘油/甲酰胺作为复合增塑剂,对淀粉/聚乳酸（PLA）复合材料进行增塑处理。研究了复合增塑剂对淀粉/PLA复合材料熔融加工性能、界面相容性、力学性能和吸水率的影响。结果表明,相对于甘油和甲酰胺单独增塑的复合材料,甘油/甲酰胺复合增塑复合材料的熔融流动性适中,有利于淀粉/PLA复合材料的挤出加工成型。甘油/甲酰胺复合增塑的复合材料界面相容性、拉伸强度、弯曲强度以及断裂伸长率都优于甘油和甲酰胺单独增塑的复合材料,而吸水率居于甘油和甲酰胺单独增塑的复合材料之间。
语种：
中文
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具有手性排列纳米纤维素的制备
作者：
王礼军;吴义强;卿彦;田翠花;易佳楠;...
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
会议名称：
第六届全国生物质材料科学与技术学术研讨会
会议时间：
2015-10-18
会议地点：
南京
会议论文集名称：
第六届全国生物质材料科学与技术学术研讨会论文集
关键词：
木质纳米纤维素;水解工艺;纸浆;手性结构;流变力学性能
摘要：
本文通过硫酸水解纸浆,制备了纤维素纳米晶体(CNC).通过环境扫描电镜(SEM)对手性木质纳米纤维素薄膜的形貌进行了表征.利用流变仪测试了纳米纤维素溶液的流变力学性能.利用偏光显微镜(POM)对纳米纤维素薄膜进行了观察.POM观察结果表明CNC薄膜具有手性结构,证明CNC悬浮液在一定条件下能自组装形成胆甾型液晶.SEM观察结果表明,CNC薄膜的形貌特征与溶致胆甾型液晶结构非常相似.
语种：
中文
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Effect of plasticizer types on the properties of starch/polylactic acid composites
作者：
左迎峰;顾继友;张彦华;吴义强
期刊：
功能材料 ,2015年46(6):06044-06048 ISSN：1001-9731
通讯作者：
Wu, Yi-Qiang
作者机构：
[吴义强; 左迎峰] College of Material Science & Engineering, Central South University of Forestry & Technology, Changsha, 410004, China;[张彦华; 顾继友] Collegeof Material Science & Engineering, Northeast Forestry University, Harbin, 150040, China
通讯机构：
[Wu, Y.-Q.] C;College of Material Science & Engineering, Central South University of Forestry & Technology, Changsha, China
关键词：
玉米淀粉;聚乳酸;乙二醇;甘油;聚乙二醇400;甲酰胺
摘要：
分别以乙二醇、甘油、聚乙二醇400和甲酰胺为增塑剂对淀粉/聚乳酸复合材料进行增塑处理,研究增塑剂种类对淀粉/聚乳酸复合材料性能的影响.采用XRD、SEM、TGA 以及旋转流变仪对复合材料的相容性进行了表征,并测试了复合材料的熔融指数、力学性能和吸水率.结果表明,增塑剂对淀粉/聚乳酸复合材料的相容性改善效果依次为甘油〉 甲酰胺〉 乙二醇〉 聚乙二醇400.淀粉/聚乳酸复合材料的力学性能和吸水率受相容性影响,呈现相容性越好,力学强度越大,断裂伸长率越大,吸水率越低的趋势.醇类增塑剂增塑复合材料的熔融流动性随着分子链增长逐渐变差,而甲酰胺增塑复合材料的熔融流动性过大.
语种：
中文
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Cellulose Nanoparticles: Structure-Morphology-Rheology Relationships
作者：
Li, Mei-Chun;Wu, Qinglin* ;Song, Kunlin;Lee, Sunyoung;Qing, Yan;...
期刊：
ACS SUSTAINABLE CHEMISTRY & ENGINEERING ,2015年3(5):821-832 ISSN：2168-0485
通讯作者：
Wu, Qinglin
作者机构：
[Song, Kunlin; Li, Mei-Chun; Wu, Qinglin] Louisiana State Univ, AgCenter, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA.;[Lee, Sunyoung] Korea Forest Res Inst, Dept Forest Prod, Seoul 130712, South Korea.;[Wu, Yiqiang; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Qinglin] L;Louisiana State Univ, AgCenter, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA.
关键词：
Cellulose nanofibers;Cellulose nanocrystals;Structure;Rheological properties;Aspect ratio
摘要：
The present study aims to investigate the structure-morphology-rheology relationships for cellulose nanoparticles (CNPs), including cellulose nanofibers (CNFs) and cellulose nanocrystals (CNCs). CNCs were extracted from never dried CNFs using sulfuric acid with controlled hydrolysis time. The crystalline structure, surface charge, morphology, and rheological behavior of the CNPs were measured and contrasted. The CNF suspensions exhibited rigid solid-like viscoelastic behavior even at a low concentration due to the formation of a highly entangled network. Upon acid hydrolysis, the network of rigid, long, and highly entangled nanofibers was eliminated, resulting in a significant loss of viscoelastic properties. Both steady-state and dynamic rheological measurements showed that the rheological behavior of the CNC suspensions was strongly dependent on the concentration and acid hydrolysis time. The CNC suspensions exhibited elastic gel-like rheological behavior at high concentrations but viscous liquid-like rheological behavior at low concentrations. Longer acid hydrolysis time produced CNCs with a lower aspect ratio, leading to higher critical transition concentration for the formation of anisotropic phase. The aspect ratio of CNCs was predicted from the intrinsic viscosity using the Simha's equation. The theoretically predicted aspect ratio values corresponded well with the transmission electron microscopy results. Finally, the network of CNF and CNC suspensions were schematically proposed. (Graph Presented). © 2015 American Chemical Society.
语种：
英文
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玻璃纤维增强淀粉/聚乳酸复合材料--纤维用量对性能的影响
作者：
左迎峰;吴义强;顾继友;张彦华
期刊：
功能材料 ,2015年46(21):21148-21152 ISSN：1001-9731
通讯作者：
Wu, Yiqiang(wuyq0506@126.com)
作者机构：
[吴义强; 左迎峰] College of Material Science & Engineering, Central South University of Forestry & Technology, Changsha, 410004, China;[张彦华; 顾继友] College of Material Science & Engineering, Northeast Forestry University, Harbin, 150040, China
通讯机构：
[Wu, Y.] C;College of Material Science & Engineering, Central South University of Forestry & Technology, Changsha, China
关键词：
玉米淀粉;聚乳酸;玻璃纤维;纤维用量
摘要：
以玉米淀粉和聚乳酸(PLA)为原料,甘油为增塑剂,通过熔融挤出法制备玻璃纤维增强淀粉/PLA复合材料。研究了玻璃纤维用量对复合材料断面形貌、力学性能、耐水性能和熔融性能的影响。结果表明,随着玻璃纤维用量增多,纤维与基体间的机械咬合作用使复合材料断裂面变得粗糙;纤维用量超过4%后,纤维之间产生相互缠结,对复合材料基体的增强效果减弱,使得断裂面的粗糙度下降。受玻璃纤维对基体增强效果的影响,随着纤维用量增多,复合材料的拉伸强度、弯曲强度和断裂伸长率都逐渐增大,吸水率逐渐降低,玻璃纤维用量为4%达到临界值。复合材料的储能模量随着玻璃纤维用量增多而增大,而熔融指数和复数粘度却随着玻璃纤维用量增多而降低。
语种：
中文
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Facile fabrication of superhydrophobic surfaces on wood substrates via a one-step hydrothermal process
作者：
Liu, Ming;Qing, Yan;Wu, Yiqiang* ;Liang, Jin;Luo, Sha
期刊：
Applied Surface Science ,2015年330:332-338 ISSN：0169-4332
通讯作者：
Wu, Yiqiang
作者机构：
[Liu, Ming; Wu, Yiqiang; Liang, Jin; Luo, Sha; Qing, Yan] 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：
Bionic nanocomposite;One-step hydrothermal process;Superhydrophobic surface;Wood substrate
摘要：
Superhydrophobic nanocomposite surfaces were successfully fabricated on wood substrates via a one-step hydrothermal process. The morphology of the nanocomposite surfaces was characterized using scanning electron microscopy (SEM), and the elemental composition was determined via energy-dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD) analysis, and Fourier transform infrared (FTIR) spectroscopy. The results indicated that the crystallization of the anatase phase of TiO 2 was prevented because of the presence of vinyltriethoxysilane [VTES, CH 2 CHSi(OC 2 H 5 ) 3 ] during the hydrothermal process. In addition, the nanocomposite contained Ti/Si particles with diameters ranging from 50 to 100 nm that thoroughly covered the wood substrate. Furthermore, the roughness coupled with the presence of low surface free energy groups led to superhydrophobicity; the static water contact angle (WCA) was as high as 153°, and the sliding angle was very low. © 2015 Elsevier B.V.
语种：
英文
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Impregnation with microcrystalline wax to improve rosewood dimensional stability and surface hardness
作者：
Li, Yun;Li, Xianjun* ;Huang, Qiongtao;Wu, Yiqiang;Li, Xingong;...
期刊：
BIORESOURCES ,2015年10(3):5994-6000 ISSN：1930-2126
通讯作者：
Li, Xianjun
作者机构：
[Li, Xingong; Li, Yun; Wu, Yiqiang; Li, Xianjun] Cent South Univ Forestry & Technol, Mat Sci & Engn Coll, Changsha 410004, Hunan, Peoples R China.;[Huang, Qiongtao] Yihua Enterprise Grp Co Ltd, Yihua Timber Ind, Shantou 515834, Guangdong, Peoples R China.;[Chen, Zhangjing] Virginia Tech Univ, Dept Sustainable Biomat, Blacksburg, VA 24061 USA.
通讯机构：
[Li, Xianjun] C;Cent South Univ Forestry & Technol, Mat Sci & Engn Coll, Changsha 410004, Hunan, Peoples R China.
关键词：
Dimensional stability;Impregnation;Microcrystalline wax;Surface hardness;Swelling and shrinkage extent
摘要：
Air-dried rosewood (Aniba rosaeodora) samples with sizes of 50 mm (length) by 50 mm (width) by 20 mm (thickness) were pretreated with NaOH to increase their permeability. The specimens were then impregnated with microcrystalline wax at a temperature of 100 °C to obtain various weight gains at four treatment durations. After impregnation, the swelling and shrinkage extents and surface hardness of the rosewood were measured. The results showed that, compared with untreated specimens, the linear swelling extent, volumetric swelling extent, and linear shrinkage extent of the impregnated specimens decreased by 75.23%, 59.85%, and 80.70%, respectively, and the surface hardness of the treated specimens increased by 43.36%. The impregnation with wax significantly increased the dimensional stability and surface hardness of the rosewood.
语种：
英文
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