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

被引：89
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
收藏
页码：941 / 947
页数：7
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