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首页> 外文期刊>Journal of Applied Polymer Science >Crystallinity and mechanical properties of polylactide/ether-amide copolymer blends
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Crystallinity and mechanical properties of polylactide/ether-amide copolymer blends

机译：聚酰胺/醚 - 酰胺共聚物共混物的结晶度和力学性能

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The present study focuses on the improvement of impact properties and particularly on the interaction between crystallinity development and mechanical properties of impact modified polylactide (PLA). The PLA was toughened by the addition of a random linear ether-amide copolymer (PEBAX 3533 (TM)). A random copolymer of ethylene, methyl-acrylate, and glycidyl-methacrylate (LOTADER AX8900 (TM)) was also used to reactively compatibilize the ether-amide copolymer with the PLA matrix. Melt rheology of the blends was investigated in small amplitude oscillatory shear and showed that the impact modifier could significantly influence the viscoelastic response of the material. The Izod impact resistance and tensile properties were measured using standard testing protocols. The blend morphology was also examined using scanning electron microscopy on cryofractured and microtomed surfaces, while the crystalline morphology was assessed by optical microscopy. A sub-micron dispersion of the impact modifier was achieved in the presence of the reactive compatibilizer. Significantly improved impact strength was found with 10 wt % impact modifier. High crystallinity samples showed the highest impact strength with values reaching 68 kJ/m(-2), hence a 20-fold improvement with respect to the neat PLA. (C) 2016 Wiley Periodicals, Inc.
机译：本研究致力于改善冲击性能，特别是对抗冲改性聚丙酯（PLA）的结晶性发育和力学性能之间的相互作用。通过添加随机线性醚 - 酰胺共聚物（PeBax 3533（Tm））来增韧PLA。还使用乙烯，甲基 - 丙烯酸甲酯和丙缩水甘油酯 - 甲基丙烯酸缩水甘油酯（TM）的随机共聚物（莲花酮AX8900（TM），以与PLA基质反应地将醚 - 酰胺共聚物转化。在小振幅振荡剪切中研究了混合物的熔体流变学，并显示了冲击改性剂可以显着影响材料的粘弹性响应。使用标准测试方案测量Izod抗冲击性和拉伸性能。还使用扫描电子显微镜检查冷冻和显微镜表面上检查混合物形态，而光学显微镜评估结晶形态。在反应性增容剂存在下实现了抗冲改性剂的亚微米分散剂。具有10wt％抗冲改性剂的产生显着改善的冲击强度。高结晶度样本显示出最高冲击强度，值达到68kJ / m（-2），因此相对于纯PLA改善20倍。 （c）2016 Wiley期刊，Inc。

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