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首页> 外文期刊>Journal of Applied Polymer Science >Bio-Plastics and Elastomers from Polylactic Acid/Thermoplastic Polyurethane Blends
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Bio-Plastics and Elastomers from Polylactic Acid/Thermoplastic Polyurethane Blends

机译：聚乳酸/热塑性聚氨酯共混物的生物塑料和弹性体

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摘要

Blends of two biocompatible polymers: thermoplastic polyester-urethane (TPU) and polylactic acid (PLA) were studied. The effect of the blending ratio on blend morphology and properties was examined by running a series of blends from 10 to 80 wt % of PLA. Increasing TPU concentration in the blends lowered the glass transition and melting point of PLA indicating that the components were compatible and partially miscible. The blends with 10–40 wt % PLA are hard, reinforced elastomers, while those with 60–80 wt % PLA are tough plastics. Cocontinuous morphology was suggested in samples with 40 and 50 wt % PLA. Inversion points between 30 and 40 wt % PLA (from globular phase is dispersed in the matrix to a cocontinuous morphology) and between 50 and 60 wt % PLA (a transition from cocontinuous to TPU dispersed in the PLA matrix) were observed. Elastomers with higher PLA content and intermediate morphology displayed a combination of high tensile strength, hardness, relatively high elongation and modulus. New materials have potential applications in the medical field.
机译：研究了两种生物相容性聚合物的混合物：热塑性聚酯-氨基甲酸酯（TPU）和聚乳酸（PLA）。通过以10重量％至80重量％的PLA进行一系列共混来检查共混比对共混物形态和性能的影响。共混物中TPU浓度的增加降低了PLA的玻璃化转变温度和熔点，表明这些组分相容且可部分混溶。 PLA含量为10–40 wt％的混合物是坚硬的增强弹性体，而PLA含量为60–80 wt％的混合物是坚韧的塑料。建议在含有40和50 wt％PLA的样品中采用共连续形态。观察到介于30和40 wt％的PLA（从球状相分散在基质中到共连续形态）的转变点和介于50和60 wt％的PLA（从共连续到TPU分散在PLA基质中的转变）的转化点。具有较高PLA含量和中间形态的弹性体表现出高拉伸强度，硬度，相对较高的伸长率和模量的组合。新材料在医学领域具有潜在的应用。

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