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首页> 外文期刊>Journal of Polymers and the Environment >Investigation on the Influence of EVA Content on the Mechanical and Thermal Characteristics of Poly(lactic acid) Blends
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Investigation on the Influence of EVA Content on the Mechanical and Thermal Characteristics of Poly(lactic acid) Blends

机译：EVA含量对聚乳酸共混物力学和热学性能的影响研究

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Poly(lactic acid) (PLA) has gained considerable attention nowadays as a biocompatible polymer owing to its advantage of being prepared from renewable resources. PLA exhibits excellent tensile strength, fabricability, thermal plasticity and biocompatibility properties comparable to many petroleum based plastics. However, low heat distortion temperature, brittleness and slow crystallization rate limit the practical applications of PLA. In order to address these limitations, an attempt has been made in the current work to prepare binary blends of PLA with ethylene vinyl acetate (EVA) at different compositions via melt mixing technique. Systematic investigation on the mechanical properties, thermal degradation and crystallization behavior for PLA-EVA blends was carried out. The impact strength of binary blends of PLA-EVA was found to increase significantly by 176% for 15 wt% of EVA compared to virgin PLA. This is due to the strong interfacial adhesion among PLA and EVA resulting in brittle to ductile transition. Scanning electron microscopy analysis for impact fractured surfaces of binary blends of PLA implied the toughening effect of PLA by EVA. Thermogravimetry analysis results revealed that the activation energy of PLA-EVA blends decreased with increase in EVA content in the PLA matrix. While, differential scanning calorimetry results obtained for PLA-EVA blends revealed the improvement in crystallinity when compared with neat PLA. The effect of EVA on non-isothermal melt crystallization kinetics of PLA was also examined via DSC at various heating rates. Decreasing trend in the t (1/2) values indicated the faster rate of crystallization mechanism after addition of EVA in the PLA matrix.
机译：聚乳酸（PLA）作为一种生物相容性聚合物，由于其由可再生资源制得的优势，如今已引起广泛关注。与许多石油基塑料相比，PLA具有出色的拉伸强度，可加工性，热可塑性和生物相容性。然而，低的热变形温度，脆性和缓慢的结晶速率限制了PLA的实际应用。为了解决这些局限性，在当前的工作中已经尝试通过熔融混合技术制备不同组成的PLA与乙烯乙酸乙烯酯（EVA）的二元共混物。对PLA-EVA共混物的力学性能，热降解和结晶行为进行了系统研究。与原始PLA相比，发现EVA的15 wt％时，PLA-EVA二元共混物的冲击强度显着提高了176％。这是由于PLA和EVA之间的强界面粘合性导致脆性到延性转变。扫描电子显微镜分析PLA的二元共混物的冲击断裂表面表明EVA增强了PLA的增韧作用。热重分析结果表明，PLA-EVA共混物的活化能随PLA基质中EVA含量的增加而降低。同时，与纯PLA相比，PLA-EVA共混物的差示扫描量热法结果显示出结晶度的改善。还通过DSC在各种加热速率下检查了EVA对PLA非等温熔体结晶动力学的影响。 t（1/2）值的下降趋势表明，在PLA基质中添加EVA后，结晶机理的速率加快了。

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