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首页> 外文期刊>Journal of Applied Polymer Science >Reactive Compatibilization of PLA/TPU Blends with a Diisocyanate
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Reactive Compatibilization of PLA/TPU Blends with a Diisocyanate

机译：PLA / TPU共混物与二异氰酸酯的反应相容性

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摘要

This study focuses on the compatibilization of poly(lactic acid) (PLA)/thermoplastic polyurethane (TPU) blends by using 1,4 phenylene diisocyanate (PDI) for the first time, as the compatibilizer. Because of the potential interactions of diisocyanates with -OH/-COOH, they are useful for reactive processing of PLA/TPU blends in the melt processing. To have insight on the reactively compatibilized structure of PLA/TPU blends, phase morphologies are observed by means of scanning electron microscopy. The mechanical, thermal, and rheological responses of the blends are investigated. The observations are that the brittle behavior of PLA changes to ductile with the addition of TPUs. The addition of PDI improves the tensile properties of the blends. The compatibilization action of PDI is monitored with DMA and rheological experiments. Cross-over in the G' and G" curves of compatibilized blends indicates the relaxation of branches formed in the presence of PDI. The dispersed phase size of TPU decreases in PLA in the presence of PDI due to the improved compatibility.
机译：这项研究的重点是首次使用1,4亚苯基二异氰酸酯（PDI）作为增容剂，从而使聚乳酸（PLA）/热塑性聚氨酯（TPU）混合物具有相容性。由于二异氰酸酯与-OH / -COOH的潜在相互作用，它们可用于熔融加工中的PLA / TPU共混物的反应性加工。为了了解PLA / TPU共混物的反应相容结构，通过扫描电子显微镜观察了相形态。研究了共混物的机械，热和流变响应。观察结果是，随着TPU的添加，PLA的脆性改变为延性。 PDI的添加改善了共混物的拉伸性能。通过DMA和流变实验监测PDI的增容作用。相容性共混物的G'和G“曲线交叉表明存在PDI时形成的支链松弛。由于PPT的相容性提高，PPU中TPU的分散相尺寸减小。

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