文献类型：期刊文献

英文题名：Plasticizing effect of poly(ethylene glycol)s with different molecular weights in poly(lactic acid)/starch blends

作者：Yu, Yunan[1];Cheng, Yan[1];Ren, Jiawei[1];Cao, Erping[1];Fu, Xiaowei[1];Guo, Weihong[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Preparat & Applicat Ultrafine Mat, Shanghai 200237, Peoples R China

年份：2015

卷号：132

期号：16

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20150400458422);WOS:【SCI-EXPANDED(收录号:WOS:000348313800005)】；

基金：The authors gratefully acknowledge the support of the Outstanding Technical Leader Plan of Shanghai (contract grant number 12XD1420400), the International Cooperation Project of Jiangsu Province (contract grant number BZ2013010), and the National Key Technology R&D Program of China (contract grant number 2012BAD32B01).

语种：英文

外文关键词：biodegradable; plasticizer; thermal properties; thermoplastics

摘要：Binary and ternary blends composed of poly(lactic acid) (PLA), starch, and poly(ethylene glycols) (PEGs) with different molecular weights (weight-average molecular weights = 300, 2000, 4000, 6000, and 10, 000 g/mol) were prepared, and the plasticizing effect and miscibility of PEGs in poly(lactic acid)/starch (PTPS) or PLA were intensively studied. The results indicate that the PEGs were effective plasticizers for the PTPS blends. The small-molecule plasticizers of PEG300 (i.e., the M-w of PEG was 300g/mol) and glycerol presented better plasticizing effects, whereas its migration and limited miscibility resulted in significant decreases in the water resistance and elongation at break. PEG2000, with a moderate molecular weight, was partially miscible in sample PTPS3; this led to better performance in water resistance and mechanical properties. For higher molecular weight PEG, its plasticization for both starch and PLA was depressed, and visible phase separation also occurred, especially for PTPS6. It was also found that the presence of PEG significantly decreased the glass-transition temperature and accelerated the crystallization of the PLA matrix, depending on the PEG molecular weight and concentration. (C) 2015 Wiley Periodicals, Inc.