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首页> 外文期刊>Journal of Applied Polymer Science >Toughness enhancement of poly(lactic acid) by melt blending with natural rubber
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Toughness enhancement of poly(lactic acid) by melt blending with natural rubber

机译：通过与天然橡胶熔融共混提高聚乳酸的韧性

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摘要

Rubber toughened poly(lactic acid) (PLA) was prepared by blending with natural rubber (NR)-based polymers. The blends contained 10 wt % of rubber and melt blended with a twin screw extruder. Enhancement of impact strength of PLA was primarily concernced. This study was focused on the effect of rubber polarity, rubber viscosity and molecular weight on mechanical properties of the blends. Three types of rubbers were used: NR, epoxidized natural rubber (ENR25 and ENR50), and natural rubber grafted with poly(methyl methacrylate) (NR-g-PMMA). Effect of viscosity and molecular weight of NR, rubber mastication with a two-roll mill was investigated. It was found that all blends showed higher impact strength than PLA and NR became the best toughening agent. Viscosity and molecular weight of NR decreased with increasing number of mastication. Impact strength of PLA/NR blends increased after applying NR mastication due to appropriate particle size. DMTA and DSC characterization were determined as well.
机译：通过与天然橡胶（NR）基聚合物共混来制备橡胶增韧聚乳酸（PLA）。所述共混物包含10重量％的橡胶，并用双螺杆挤出机熔融共混。主要关注提高PLA的冲击强度。这项研究的重点是橡胶极性，橡胶粘度和分子量对共混物机械性能的影响。使用了三种类型的橡胶：NR，环氧化天然橡胶（ENR25和ENR50）以及接有聚甲基丙烯酸甲酯（NR-g-PMMA）的天然橡胶。研究了两辊磨对橡胶的咀嚼作用对NR的粘度和分子量的影响。发现所有共混物均显示出比PLA高的冲击强度，而NR成为最佳的增韧剂。 NR的粘度和分子量随咀嚼次数的增加而降低。由于颗粒尺寸合适，施加NR咀嚼后，PLA / NR共混物的冲击强度增加。还确定了DMTA和DSC的表征。

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