Compatibility and phase structure of binary blends of poly(lactic acid) and glycidyl methacrylate grafted poly(ethylene octane)
Compatibility and phase structure of binary blends of poly(lactic acid) and glycidyl methacrylate grafted poly(ethylene octane)
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聚乳酸与甲基丙烯酸缩水甘油酯接枝聚乙烯辛烷二元共混物的相容性和相结构
DOI：
10.1016/j.eurpolymj.2009.04.028
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发表时间：
2009-08-01
影响因子：
6
通讯作者：
Wu, Chifei
中科院分区：
文献类型：
--
作者：
Su, Zhizhong;Li, Qiuying;Wu, Chifei
采用傅里叶变换红外光谱（FTIR）、动态力学分析（DMA）、扫描电镜（SEM）和广角X射线衍射（WAXD）等方法研究了聚乳酸（PLA）与甲基丙烯酸缩水甘油酯接枝聚乙烯辛烷（GMA-g-POE，简称mPOE）共混物的相容性、相结构和组分间相互作用。所有的二元共混物组合物表现出两个不同的玻璃化转变温度对应的mPOE丰富和PLA丰富的阶段，分别。此外，随着mPOE含量的增加，这两个峰彼此接近，表明PLA和mPOE之间的部分相容性。PLA的端羧基与mPOE的环氧基之间的化学反应被认为是增强相容性的驱动力。它们导致共混物的粘度增加和PLA的结构对称性降低。这一结果导致球晶生长速率和结晶度降低。mPOE的玻璃化转变温度（T-g）降低归因于施加在分散橡胶相上的负压，这是由于在从熔融状态冷却时热收缩失配而导致的差异收缩。分散粒子中的负压又会对粒子间的基体韧带产生扩张效应，从而提高PLA的韧性和延展性。(c)2009爱思唯尔有限公司保留所有权利。
This work study is the compatibility, phase structure, and component interaction of poly(lactic acid) (PLA) and glycidyl methacrylate grafted poly(ethylene octane) (GMA-g-POE denoted as mPOE) blend by Fourier transform infrared (FTIR) spectra, dynamic mechanical analysis (DMA), scanning electron microscopy (SEM), and wide-angle X-ray diffraction (WAXD), respectively. All the binary blend compositions exhibit two distinct glass transition temperatures corresponding to the mPOE-rich and PLA-rich phases, respectively. Moreover, these two peaks approach each other with increasing mPOE content, indicating partial compatibility between the PLA and mPOE. Chemical reactions between the end carboxyl groups of the PLA and epoxy groups of the mPOE are considered as the driving force of the enhanced compatibility. They lead to an increase in viscosity of the blends and a decrease in the structural symmetry of PLA. This result brings about a decrease in the spherulite growth rate and the degree of crystallinity. Glass transition temperature (T-g) depression of mPOE is attributed to the negative pressure imposed on the dispersed rubber phase, resulting from differential contraction due to the thermal shrinkage mismatch upon cooling from the melt state. The negative pressure in the dispersed particles, in turn, would cause a dilational effect for the matrix ligament between the particles, and therefore increases the ductility and toughness of PLA. (c) 2009 Elsevier Ltd. All rights reserved.