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首页> 外文期刊>Journal of Applied Polymer Science >Toughening of polylactide by melt blending with linear low-density polyethylene
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Toughening of polylactide by melt blending with linear low-density polyethylene

机译：通过与线性低密度聚乙烯熔融共混来增韧聚丙交酯

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Melt blending of polylactide and linear low-density polyethylene (LLDPE) was performed in an effort to toughen polylactide. In addition, two model polylactide-polyethylene (PLLA-PE) block copolymers were investigated as compatibilizers. The LLDPE particle size and the impact resistance of binary and ternary blends were measured to determine the extent of compatibilization. For the amorphous polylactide (PLA), toughening was achieved only when a PLLA-PE block copolymer was used as a compatibilizer. For the semicrystalline polylactide (PLLA), toughening was achieved in the absence of block copolymer. To decrease the variability in the impact resistance of the PLLA/LLDPE binary blend, as little as 0.5 wt % of a PLLA-PE block copolymer was effective. The differences that were seen between the PLA and PLLA binary blends were investigated with adhesion testing. The semicrystalline PLLA did show significantly better adhesion to the LLDPE. We propose that tacticty effects on the entanglement molecular weight or miscibility of polylactide allow for the improved adhesion between the PLLA and LLDPE. (C) 2003 Wiley Periodicals, Inc. [References: 47]
机译：为了使聚丙交酯增韧，进行了聚丙交酯和线性低密度聚乙烯（LLDPE）的熔融共混。另外，还研究了两种模型聚丙交酯-聚乙烯（PLLA-PE）嵌段共聚物作为增容剂。测量LLDPE粒径和二元和三元混合物的抗冲击性，以确定相容性的程度。对于无定形聚丙交酯（PLA），仅当将PLLA-PE嵌段共聚物用作增容剂时才能实现增韧。对于半结晶聚丙交酯（PLLA），在不存在嵌段共聚物的情况下实现了增韧。为了降低PLLA / LLDPE二元共混物的耐冲击性的差异，低至0.5重量％的PLLA-PE嵌段共聚物是有效的。通过粘合力测试研究了PLA和PLLA二元共混物之间的差异。半结晶PLLA确实表现出对LLDPE的明显更好的附着力。我们提出，对交缠分子量或聚丙交酯的混溶性有一定的战术效果，可以改善PLLA和LLDPE之间的粘合力。 （C）2003 Wiley Periodicals，Inc. [参考：47]

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