Effect of crystallization on microstructure and mechanical properties of poly[(ethylene oxide)-block-(amide-12)]-toughened poly(lactic acid) blend

被引：28

作者：

Han, Lijing ^{[1
,2
]}

Han, Changyu ^{[1
]}

Dong, Lisong ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, Key Lab Polymer Ecomat, Changchun 130022, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 10080, Peoples R China

来源：

POLYMER INTERNATIONAL | 2013年 / 62卷 / 02期

基金：

美国国家科学基金会;

关键词：

poly(lactic acid); poly[(ethylene oxide)-block-(amide-12); crystallization; toughness; THERMOPLASTIC ELASTOMERS; ISOTACTIC POLYPROPYLENE; POLY(L-LACTIDE); POLYLACTIDE; BEHAVIOR; COPOLYMERS; POLY(ETHYLENE-CO-OCTENE); CRYSTALLINITY; DEFORMATION;

D O I：

10.1002/pi.4300

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The effect of crystallization on the microstructure and mechanical properties of a poly[(ethylene oxide)-block-(amide-12)] (PEBA)-toughened poly(lactic acid) (PLA) blend was investigated. Annealing was used to govern the crystallization microstructure and hence the mechanical properties of the blend. Crystallization resulted in the morphology of the PLA component altering from a continuous amorphous phase to continuous crystalline phase. Moreover, as the crystallization of PLA proceeded, the degree of crystallinity, spherulite size and lamellar thickness increased, and the interlamellar and interspherulitic connections became weaker. These led to the large plastic deformation in the matrix during tension being suppressed, and cracks appeared easily under tensile load, which was favorable to fracture for the blend during tension and so a small elongation at break was obtained. However, the elongation at break for all the annealed specimens was higher than that for neat amorphous PLA, suggesting that PEBA still showed a toughening effect for PLA under annealing. (C) 2012 Society of Chemical Industry

引用

页码：295 / 303

页数：9

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