Abstract

In this work, interchange reactions between poly(lactic acid) and poly(ethylene-co-vinyl acetate) is catalyzed by adding samarium acetylacetonate aiming to create a catalytic transesterification reaction and compatibilization between polymer blends. The impact of the samarium acetylacetonate content on transesterification reactions was studied. The FTIR analysis shows that all exposed samples exhibited an increase in the absorption of the carbonyl region with augmentation of vinyl acetate and catalyst content. The results of torque analysis show that the mixing torque reduces with increasing the content of the catalyst due to the contribution of its plasticizing effect in reducing of the mixture viscosity and the significant structural changes. DSC analysis illustrates that the glass transition temperature values of both polymers were unaffected after blending indicating their immiscibility. However, during melt mixing of polymers with catalyst, decrease of the glass transition, crystallization and melting temperatures are observed. The mechanical performance of blend is enhanced with the addition of catalyst.

中文翻译：

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乙酰丙酮钐催化剂对聚（乳酸）/聚（乙烯-共-醋酸乙烯酯）共混物相容性的影响：热机械、化学和粘弹性表征

摘要

在这项工作中，聚（乳酸）和聚（乙烯-co-醋酸乙烯酯）通过添加乙酰丙酮钐进行催化，目的是在聚合物共混物之间产生催化酯交换反应和增容作用。研究了乙酰丙酮钐含量对酯交换反应的影响。FTIR 分析表明，随着醋酸乙烯酯和催化剂含量的增加，所有暴露的样品都表现出羰基区域的吸收增加。扭矩分析结果表明，由于催化剂的增塑作用对降低混合物粘度的贡献和显着的结构变化，混合扭矩随着催化剂含量的增加而减小。DSC 分析表明两种聚合物的玻璃化转变温度值在共混后不受影响，表明它们不混溶。然而，在聚合物与催化剂的熔融混合过程中，观察到玻璃化转变温度、结晶温度和熔融温度的降低。催化剂的加入提高了共混物的机械性能。