Thermal, mechanical, and rheological properties of plasticized poly( L ‐lactic acid) | Zendy

Ge Huanhuan | Zendy; Yang Fan | Zendy; Hao Yanping | Zendy; Wu Guangfeng | Zendy; Zhang Huiliang | Zendy; Dong Lisong | Zendy

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Thermal, mechanical, and rheological properties of plasticized poly( L ‐lactic acid)

Author(s) -

Ge Huanhuan,

Yang Fan,

Hao Yanping,

Wu Guangfeng,

Zhang Huiliang,

Dong Lisong

Publication year - 2012

Publication title -

journal of applied polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.575

H-Index - 166

eISSN - 1097-4628

pISSN - 0021-8995

DOI - 10.1002/app.37620

Subject(s) - differential scanning calorimetry , materials science , rheology , izod impact strength test , polylactic acid , plasticizer , rheometry , composite material , dynamic mechanical analysis , viscosity , lactic acid , apparent viscosity , polymer chemistry , ultimate tensile strength , polymer , physics , genetics , biology , bacteria , thermodynamics

Polylactide (PLA) is an attractive candidate for replacing petrochemical polymers because it is biodegradable. In this study, a specific PLA 2002D was melt‐mixed with a new plasticizer: glycerol monostearate (GMS). The PLA/GMS blends with different ratios were analyzed by dynamic mechanical analysis and differential scanning calorimetry. Although a slightly phase separation can be seen in DSC curves, the SEM micrographs of the impact fracture surfaces of PLA/GMS blends had a relatively good separation and this phenomenon was in good agreement with their higher impact strength. The result showed that the adding of GMS has enhanced the flexibility of PLA/GMS blends as compared to neat PLA. The relationship between complex viscosity and angular frequency of the PLA/GMS blends exhibits that the melt viscosity substantially lower than that of neat PLA. For example, at 10 rad/s, the melt viscosity of PLA/GMS (85/15) was reduced by about 7.2% compared to that of neat PLA. The impact strength was changed from 4.7 KJ/m 2 for neat PLA to 48.2 KJ/m 2 for 70/30 PLA/GMS blend. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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