期刊
CARBOHYDRATE POLYMERS
卷 90, 期 1, 页码 301-308出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.05.042
关键词
Electrospinning; Cellulose nanocrystals; Nanocomposites; Poly(lactic acid) (PLA); In vitro degradation
资金
- USDA Rural Development Biomass Initiative Program [68-3A75-6-508]
- National Key Technology R&D Program of China [2008BAC46B10]
- Engineering Research Center of Biomass Materials, Ministry of Education, Southwest University of Science and Technology, Mianyang, China
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.
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