Thermal and mechanical properties of blends of polylactide and poly(ethylene glycol‐co‐propylene glycol): Influence of annealing

• DOI: 10.1002/app.31701
• Publication Date: 2010-01-07T19:16:59Z
• Authors: Xianghai Ran; Zhiyuan Jia; Changyu Han; Yuming Yang; Lisong Dong
• Keywords: Elongation; Polyvinyl Alcohol

Abstract Two kinds of polylactide (PLA) which was named PLA1 with L ‐lactide content 98% and PLA2 88% were blended poly(ethylene glycol‐ co ‐propylene glycol) (PEPG) in a batchwise mixer pressed into films. The effect annealing on the thermal properties, crystallization behavior, mechanical properties quenched blends studied by means differential scanning calorimetry (DSC), dynamic analysis (DMA), polar optical microscopy (POM), tensile tests. PEPG miscible two PLA blend composition range 5–20 wt % can effectively decrease glass transition temperature PLA. Neat lost ability to crystallize DSC DMA measurements; however, it could after for long time more easily due improved crystallizability addition PEPG. Both PLAs underwent cold when at 90°C, there signs phase separation occurring same time. morphology annealed different dependent purity regained brittleness maximum elongation break about 20% showed larger spherulites POM images, whereas still kept some flexibility 65% fine spherulites. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci,