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首页> 外文期刊>Journal of Polymers and the Environment >Starch, Poly(lactic acid), and Poly(vinyl alcohol) Blends
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Starch, Poly(lactic acid), and Poly(vinyl alcohol) Blends

机译：淀粉，聚乳酸和聚乙烯醇混合物

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Research on biodegradable materials has been stimulated due to concern regarding the persistence of plastic wastes. Blending starch with poly(lactic acid) (PLA) is one of the most promising efforts because starch is an abundant and cheap biopolymer and PLA is biodegradable with good mechanical properties. Poly(vinyl alcohol) (PVOH) contains unhydrolytic residual groups of poly(vinyl acetate) and also has good compatibility with starch. It was added to a starch and PLA blend (50:50, w/w) to enhance compatibility and improve mechanical properties. PVOH (M_w 6,000) at 10%, 20%, 30%, 40%, 50% (by weight) based on the total weight of starch and PLA, and 30% PVOH at various molecular weights (M_w 6,000, 25,000, 78,000, and 125,000 dalton) were added to starch/PLA blends. PVOH interacted with starch. At proportions greater than 30%, PVOH form a continuous phase with starch. Tensile strength of the starch/PLA blends increased as PVOH concentration increased up to 40% and decreased as PVOH molecular weight increased. The increasing molecular weight of PVOH slightly affected water absorption, but increasing PVOH concentration to 40% or 50% increased water absorption. Effects of moisture content on the starch/PLA/PVOH blend also were explored. The blend containing gelatinized starch had higher tensile strength. However, gelatinized starch also resulted in increased water absorption.
机译：由于对塑料废物的持久性的关注，已经刺激了对可生物降解材料的研究。将淀粉与聚乳酸（PLA）混合是最有前途的工作之一，因为淀粉是一种丰富而廉价的生物聚合物，而PLA可生物降解并具有良好的机械性能。聚乙烯醇（PVOH）包含聚乙酸乙烯酯的非水解残基，并且与淀粉具有良好的相容性。将其添加到淀粉和PLA的混合物（重量比为50:50）中，以增强相容性并改善机械性能。 PVOH（M_w 6,000），以淀粉和PLA的总重量计分别为10％，20％，30％，40％，50％（按重量计）和30％PVOH，其分子量分别为（M_w 6,000、25,000、78,000，和125,000道尔顿）被添加到淀粉/ PLA共混物中。 PVOH与淀粉相互作用。比例大于30％的PVOH与淀粉形成连续相。淀粉/ PLA共混物的拉伸强度随PVOH浓度增加至40％而增加，随PVOH分子量增加而降低。 PVOH分子量的增加对吸水率的影响很小，但将PVOH浓度增加到40％或50％则增加了吸水率。还研究了水分含量对淀粉/ PLA / PVOH共混物的影响。包含糊化淀粉的共混物具有较高的拉伸强度。但是，糊化淀粉也导致吸水率增加。

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