Isothermal crystallization kinetics of thermoplastic starch/poly(lactic acid) composites

被引：88

作者：

Cai, Jie ^{[1
,2
]}

Liu, Miao ^{[1
,2
]}

Wang, Li ^{[1
,2
]}

Yao, Kunhua ^{[1
,2
]}

Li, Sha ^{[1
,2
]}

Xiong, Hanguo ^{[1
,2
]}

机构：

[1] Huazhong Agr Univ, Coll Food Sci & Technol, Wuhan 430070, Hubei, Peoples R China

[2] Huazhong Agr Univ, Res Inst Comprehens Utilizat Biomat, Wuhan 430070, Hubei, Peoples R China

来源：

CARBOHYDRATE POLYMERS | 2011年 / 86卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Thermoplastic starch; Poly(lactic acid); Isothermal crystallization kinetics; DSC; MECHANICAL-PROPERTIES; NONISOTHERMAL CRYSTALLIZATION; THERMAL-PROPERTIES; POLY(LACTIC ACID); STARCH; BLENDS; MORPHOLOGY; POLYMER; MELT;

D O I：

10.1016/j.carbpol.2011.05.044

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The thermoplastic starch/poly(lactic acid) (TPS/PLA) composites were prepared using PLA melt blending with glycerol plasticized-starch. A systematic study of the isothermal crystallization kinetics of TPS/PLA composites was performed by differential scanning calorimetry (DSC) at different crystallization temperatures (T-c). The analysis based on the Avrami theory, which was applied to describe the process of isothermal crystallization, indicated that the spherulite growth rate, overall crystallization rate, and activation energy (Delta E-a) of TPS/PLA composites were remarkably affected by the incorporation of TPS. TPS acts as a nucleating agent, improving the crystallinity of PLA in the composites. Furthermore, according to Lauritzen-Hoffman kinetic theory, the fold surface free energy (sigma(e)) of PLA blends is found to be higher than that of neat PLA. leading to a higher work of chain folding (q) and is ascribed to a general constraint of the PLA chain mobility in the composite melt due to the presence of TPS. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：941 / 947

页数：7