Molecular modeling study of the resistance of PLA to hydrolysis based on the blending of PLLA and PDLA

被引:80
作者
Karst, David
Yang, Yiqi
机构
[1] Univ Nebraska, Dept Text Clothing & Desing, Lincoln, NE 68583 USA
[2] Univ Nebraska, Dept Biol Syst Engn, Lincoln, NE 68583 USA
关键词
hydrolysis; degradation; polylactic acid;
D O I
10.1016/j.polymer.2006.05.002
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Molecular modeling has been used to explain how the blending of poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) affects the resistance of poly(lactide) (PLA) to hydrolysis. Amorphous PLLA/PDLA blends were created using molecular modeling, and the minimum potential energy of the blends before and after hydrolysis were obtained. The 50/50 blend has the greatest resistance to hydrolysis. which agrees with past experiments and is due to its having stronger hydrogen-bonding and dipole-dipole interactions than pure PLLA or PDLA. This is based on the 50/50 blend having more of these interactions and shorter average lengths for the hydrogen-bonds and dipole-dipole interactions compared to pure PLLA and PDLA. Hydrogen-bonding possibly has a greater effect than the dipole-dipole interactions on the resistance to hydrolysis. The chance in potential energy for hydrolysis decreases linearly with increasing % PLLA or % PDLA from 0 to 50%. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:4845 / 4850
页数:6
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