文献类型：期刊文献

英文题名：Mechanical properties and in vitro degradation of electrospun bio-nanocomposite mats from PLA and cellulose nanocrystals

作者：Shi, Qingfeng[1,2];Zhou, Chengjun[1];Yue, Yiying[1];Guo, Weihong[2];Wu, Yiqiang[3];Wu, Qinglin[1]

机构：[1]Louisiana State Univ, Ctr Agr, Sch Renewable Nat Resource, Baton Rouge, LA 70803 USA;[2]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[3]Cent S Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China

年份：2012

卷号：90

期号：1

起止页码：301

外文期刊名：CARBOHYDRATE POLYMERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000308267000043)】；

基金：This work is financially supported by the USDA Rural Development Biomass Initiative Program (68-3A75-6-508), National Key Technology R&D Program of China (2008BAC46B10), and 2010 start-up fund of Engineering Research Center of Biomass Materials, Ministry of Education, Southwest University of Science and Technology, Mianyang, China.

语种：英文

外文关键词：Electrospinning; Cellulose nanocrystals; Nanocomposites; Poly(lactic acid) (PLA); In vitro degradation

摘要：Fibrous bio-nanocomposite mats consisting of cellulose nanocrystals (CNCs) and poly(lactic acid) (PIA) were electrospun from a solvent mixture consisting of N,N'-dimethylformamide and chloroform at room temperature. Morphological, mechanical and thermal properties, as well as in vitro degradation of nanocomposite mats were characterized as a function of material composition. Average diameter of the electrospun fibers decreased with increased CNC-loading level. Thermal stability, and tensile strength and modulus of nanocomposite mats were effectively improved by the addition of CNCs up to the 5 wt% level. The reinforcement of CNCs on electrospun mats was illustrated by the observation of SEM-based morphologies on the tensile fracturing process of nanocomposite mats. At the CNC content of 5 wt%, the maximum tensile stress and Young's modulus of the nanocomposite mats increased by 5 and 22 folds than those of neat PEA mats, respectively. Moreover, compared with neat PEA mats, the nanocomposite mats, especially at high CNC-loading levels, degraded more rapidly in phosphate-buffered saline solution. (C) 2012 Elsevier Ltd. All rights reserved.