期刊
POLYMER
卷 49, 期 18, 页码 3902-3910出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2008.06.054
关键词
TPO-PLA copolymer; compatibilizer; toughness
资金
- Industrial Technology Research Institute of Taiwan, ROC
A thermoplastic polyolefin elastomer-graft-polylactide (TPO-PLA) was prepared by grafting polylactide onto maleic anhydride-functionalized TPO (TPO-MAH) in the presence of 4-dimethylaminopyridine (DMAP). The characterization of the TPO-PLA copolymers was conducted by FT-IR and H-1 NMR. The effects of reaction temperature and concentration of DMAP on the reactivity of graft polymerization were investigated by FT-IR, which revealed that a high reaction temperature and a high DMAP concentration are associated with dramatic depolymerization of PLA and reduction of steric hindrance effect in the graft reaction. A Molau test, SEM observations of cyro-fractured surface morphology and particle size analysis of PLA/TPO blend system demonstrate that this new copolymer, acting as a premade compatibilizer, significantly improved the compatibility of the PLA/TPO blends. As the concentration of TPO-PLA copolymer increased, elongation at break and tensile toughness increased with compatibilizer concentration up to 2.5 wt%, beyond which it declined, but TPO-PLA copolymer did not affect the tensile strength or modulus. The effect of the chemical composition of the TPO-PLA copolymer on the compatibilization efficiency and mechanical properties of the PLA/TPO blends was examined by altering the number of grafting sites and concentration of DMAP, suggesting that DMAP concentration dominated the properties of the ternary blend system. Two compatibilizers, TPO-MAH and TPO-PLA, were used to compatibilize the PLA/TPO blend; the results suggested that TPO-PLA was more efficient in reducing the interfacial tension between the two immiscible polymers and in improving the mechanical properties of PLA/TPO blending specimens. (C) 2008 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