Poly(Ethylene Glycol) as a Compatibilizer for Poly(Lactic Acid)/Thermoplastic Starch Blends

被引：89

作者：

Favaro Ferrarezi, Marcia Maria ^{[1
]}

Taipina, Marcia de Oliveira ^{[1
]}

Escobar da Silva, Laura Caetano ^{[1
]}

Goncalves, Maria do Carmo ^{[1
]}

机构：

[1] Univ Campinas UNICAMP, Inst Chem, Campinas, SP, Brazil

来源：

JOURNAL OF POLYMERS AND THE ENVIRONMENT | 2013年 / 21卷 / 01期

基金：

巴西圣保罗研究基金会;

关键词：

Poly(lactic acid); Thermoplastic starch; Poly(ethylene glycol); Blend; Morphology; BIODEGRADABLE POLYMER BLENDS; THERMOPLASTIC STARCH; TERNARY BLENDS; THERMAL CHARACTERIZATION; RENEWABLE RESOURCES; MOLECULAR-WEIGHT; ACID); POLYLACTIDE; MISCIBILITY; POLY(L-LACTIDE);

D O I：

10.1007/s10924-012-0480-z

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A new route to prepare poly(lactic acid) (PLA)/thermoplastic starch (TPS) blends is described in this work using poly(ethylene glycol) (PEG), a non-toxic polymer, as a compatibilizer. The influence of PEG on the morphology and properties of PLA/TPS blends was studied. The blends were processed using a twin-screw micro-compounder and a micro-injector. The morphologies were analyzed by scanning and transmission electron microscopies and the material properties were evaluated by dynamic-mechanical, differential scanning calorimetry, thermogravimetric analysis and mechanical tests. PLA/TPS blends presented large TPS phase size distribution and low adhesion between phases which was responsible for the lower elastic modulus of this blend when compared to pure PLA. The addition of PEG resulted in the increase of PLA crystallization, due to its plasticizing effect, and improvement of the interfacial interaction between TPS and PLA matrix. Results show that incorporation of PEG increased the impact strength of the ternary blend and that the elastic modulus remained similar to the PLA/TPS blend.

引用

页码：151 / 159

页数：9

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