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[2]; Yue, Yiying[2]; Guo, Weihong[1]; Wu, Yiqiang[3]; Wu, Qinglin[2]

机构：[1] School of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237, China; [2] School of Renewable Natural Resource, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, United States; [3] College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China

年份：2012

卷号：90

期号：1

起止页码：301

外文期刊名：Carbohydrate Polymers

收录：EI(收录号：20123015283523)

语种：英文

外文关键词：Organic solvents - Elastic moduli - Lactic acid - Nanocrystals - Biodegradation - Chlorine compounds - Cellulose - Dimethylformamide - Tensile strength - Cellulose derivatives - Electrospinning

摘要：Fibrous bio-nanocomposite mats consisting of cellulose nanocrystals (CNCs) and poly(lactic acid) (PLA) 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 PLA mats, respectively. Moreover, compared with neat PLA mats, the nanocomposite mats, especially at high CNC-loading levels, degraded more rapidly in phosphate-buffered saline solution. ? 2012 Elsevier Ltd.