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首页> 外文期刊>RSC Advances >Effect of biodegradable poly(ethylene adipate) with low molecular weight as an efficient plasticizer on the significantly enhanced crystallization rate and mechanical properties of poly((L)- lactide)
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Effect of biodegradable poly(ethylene adipate) with low molecular weight as an efficient plasticizer on the significantly enhanced crystallization rate and mechanical properties of poly((L)- lactide)

机译：低分子量可生物降解的聚己二酸乙二醇酯作为高效增塑剂对聚（L）-丙交酯的结晶速率和机械性能的显着提高

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摘要

The slow crystallization rate and low elongation at break are the main drawbacks of biodegradable poly((L-)lactide) (PLLA) from a viewpoint of practical application. Such disadvantages of PLLA have been successfully resolved by blending with low molecular weight biodegradable poly(ethylene adipate) (PEA) in the present work. As a biodegradable plasticizer, PEA not only formed fully miscible and biodegradable polymer blends with PLLA but also apparently reduced the glass transition temperature of the blends. The increased chain mobility favored the nonisothermal cold and melt crystallization behaviors, increased the spherulitic growth rate, and accelerated the overall isothermal melt crystallization process of the blends; however, the blends had the same crystallization mechanism and crystal structures as neat PLLA. One of the exciting results was that the elongation at break value of an 80/20 PLLA/PEA blend was dramatically increased; therefore, for a wider practical application, the preparation of PLLA-based materials with fast crystallization rate, good mechanical properties, and complete biodegradability could be accomplished by the blending with a small amount of PEA with low molecular weight as an efficient plasticizer.
机译：从实际应用的观点来看，缓慢的结晶速率和低的断裂伸长率是可生物降解的聚（（L-）丙交酯）（PLLA）的主要缺点。通过与低分子量可生物降解的聚己二酸乙二醇酯（PEA）混合，已经成功解决了PLLA的这些缺点。作为可生物降解的增塑剂，PEA不仅与PLLA形成了完全可混溶和可生物降解的聚合物共混物，而且还明显降低了该共混物的玻璃化转变温度。链迁移率的提高有利于非等温熔体和非结晶体的结晶行为，提高了球晶的生长速率，并加速了共混物的整体等温熔体结晶过程。然而，共混物具有与纯PLLA相同的结晶机理和晶体结构。令人兴奋的结果之一是80/20 PLLA / PEA共混物的断裂伸长率值显着增加。因此，对于更广泛的实际应用，通过与少量低分子量的PEA掺混作为有效的增塑剂，可以制备出结晶速度快，机械性能好，生物降解性完全的PLLA基材料。

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