期刊
POLYMER DEGRADATION AND STABILITY
卷 95, 期 4, 页码 477-484出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2010.01.008
关键词
Poly(lactide); Poly(lactic acid); In vitro autocatalytic hydrolysis; Stereocomplex; Enantiomeric polymer blends
资金
- Japan Society for the Promotion of Science (JSPS) [19500404]
Poly(L-lactide) (PLLA)/poly(D-lactide) (PDLA) blend specimens containing only stereocomplex as crystalline species, together with those of pure PLLA and PDLA specimens, were prepared by solution crystallization using acetonitrile as the solvent. Their accelerated hydrolytic degradation was carried out in phosphate-buffered solution at elevated temperatures of 70-97 degrees C Up to the late stage. During hydrolytic degradation, the stereocornplex crystalline residues were first traced by gel permeation chromatography. Similar to the hydrolytic degradation of pure PLLA and PDLA specimens, the hydrolytic degradation of stereocomplexed PLLA/PDLA blend specimens slowed down at the late stage when most of the amorphous chains were removed and crystalline resides were formed and degraded. The estimated activation energy for hydrolytic degradation of stereocornplex crystalline residues (97.3 kJ mol(-1)) is significantly higher than 75.2 kJ mol(-1) reported for alpha-form of PLLA crystalline residues. This indicates that the stereocomplex Crystalline residues showed the higher hydrolysis resistance compared to that of alpha-form of PLLA crystalline residues. (C) 2010 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据