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首页> 外文期刊>Journal of Applied Polymer Science >Properties of poly(lactic acid) blends with various starches as affected by physical aging
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Properties of poly(lactic acid) blends with various starches as affected by physical aging

机译：物理老化对聚乳酸与各种淀粉共混物的影响

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Poly(lactic acid) (PLA) and starch are both biodegradable and renewable polymers derived from agricultural feedstock. A previous study showed that a small amount (0.5%) of methylenediphenyl diisocyanate (MDI) could enhance the mechanical properties of starch and PLA blends by improving the interfacial interaction. In this study, blends of PLA (1/1, w/w) and starch with or without MDI were evaluated for thermal and mechanical properties as well as morphology, as affected by physical aging when stored up to 12 months at 25 degreesC and 50% relative humidity. The blends were prepared by thermally blending PLA with wheat starch, corn starch, and/or high amylose corn starch, with or without MDI. All samples exhibited phenomena of physical aging. The samples with MDI aged more slowly, showing a slower reduction rate of excess enthalpy relaxation, than those without MDI. The mechanical properties decreased slowly as aging proceeded. Microstructure showed a reduced interaction between starch and PLA around the interface with aging. (C) 2003 Wiley Periodicals, Inc. [References: 18]
机译：聚乳酸（PLA）和淀粉都是可生物降解的可再生聚合物，均来自农业原料。先前的研究表明，少量（0.5％）的亚甲基二苯基二异氰酸酯（MDI）可通过改善界面相互作用来增强淀粉和PLA共混物的机械性能。在这项研究中，评估了PLA（1/1，w / w）和含或不含MDI的淀粉共混物的热，机械性能以及形态，在25℃和50的温度下储存12个月时会受到物理老化的影响％ 相对湿度。通过将PLA与小麦淀粉，玉米淀粉和/或高直链淀粉玉米淀粉（有或没有MDI）进行热共混制备。所有样品均表现出物理老化现象。与没有MDI的样品相比，具有MDI的样品老化更慢，显示出过量焓弛豫的降低速率更慢。随着老化的进行，机械性能缓慢降低。微观结构显示，随着老化，界面周围的淀粉与PLA之间的相互作用降低。 （C）2003 Wiley Periodicals，Inc. [参考：18]

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