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首页> 外文期刊>Journal of Applied Polymer Science >Strengthening Blends of Poly(lactic acid) and Starch with Methylenediphenyl Diisocyanate
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Strengthening Blends of Poly(lactic acid) and Starch with Methylenediphenyl Diisocyanate

机译：亚甲基二苯基二异氰酸酯增强聚乳酸和淀粉的共混物

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摘要

oly(lactic acid) (PLA) is a biodegradable polymer, but its applications are limited by its high cost. Blending granular starch with PLA reduces the cost, but the blend has poor strength properties. In this study, a 55/45 (w/w) mixture of PLA (weight-average molecular weight = 120,000 Da) and dried wheat starch was blended thermally in an intensive mixer with or without a low level of methylendiphenyl diisocyanate (MDI). Blends with MDI had enhanced mechanical proeprties that could be explained by the in situ formation of a block copolymer acting as a compatibilizier. Scanning electronmicrographs showed reduced interfacial tension between the two phases. The presence of MDI also enhanced the mechanical properties of the blend at temperatures above the glass-transition temperature. Water uptakes by the PLA/starch blends with and without MDI did not differ.
机译：聚乳酸（PLA）是一种可生物降解的聚合物，但其应用受到高成本的限制。将粒状淀粉与PLA掺混可降低成本，但掺混物的强度性能较差。在这项研究中，将PLA（重均分子量= 120,000 Da）和干燥的小麦淀粉的55/45（w / w）混合物在有或没有低水平甲基二苯二异氰酸酯（MDI）的强力混合器中进行热混合。与MDI的共混物具有增强的机械性能，这可以通过原位形成嵌段共聚物作为相容剂来解释。扫描电子显微照片显示两相之间的界面张力降低。在高于玻璃化转变温度的温度下，MDI的存在还增强了共混物的机械性能。含或不含MDI的PLA /淀粉混合物的吸水率没有差异。

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