The Case for Polylactic Acid as a Commodity Packaging Plastic
The Case for Polylactic Acid as a Commodity Packaging Plastic
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DOI：
10.1080/10601329608010880
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发表时间：
1996-05
期刊：
影响因子：
--
通讯作者：
R. G. Sinclair
中科院分区：
文献类型：
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作者：
R. G. Sinclair
摘要聚乳酸，有时称为聚乳酸，可满足包装热塑性塑料的许多要求，并被建议作为一般包装应用的商品树脂。其一般物理性能和熔体加工易用性类似于传统的包装树脂。即使在略微潮湿的环境中，聚乳酸也会在几个月到一年的时间内通过水解慢慢降解为环境友好型产品，这些产品进而生物降解为二氧化碳、甲烷和水。当从熔体中淬火时，聚乳酸是一种透明、无色的热塑性塑料，在许多方面与聚苯乙烯相似。当用自己的单体增塑时，聚乳酸变得越来越灵活，从而可以制备出一系列连续的产品，可以模仿PVC、LDPE、LLDPE、PP和PS。随着增塑剂的增加，降解率增加，并且增塑剂含量和/或取向度的降低有利于保质期。取向还显著提高了抗拉强度、模数和热稳定性。
Abstract Polylactide, sometimes called polylactic acid (PLA), meets many requirements as a packaging thermoplastic and is suggested as a commodity resin for general packaging applications. Its general physical properties and melt processing ease are similar to conventional packaging resins. PLA slowly degrades by hydrolysis in even a slightly moist environment over a period of several months to a year to environmentally-friendly products, which, in turn, biodegrade to carbon dioxide, methane, and water. PLA is a clear, colorless thermoplastic when quenched from the melt and is similar in many respects to polystyrene. When plasticized with its own monomers, PLA becomes increasingly flexible so that a continuous series of products can be prepared that can mimic PVC, LDPE, LLDPE, PP, and PS. Degradation is increased with increasing plasticizer, and shelf life is favored by decreasing plasticizer content and/or orientation. Orientation also substantially improves tensile strength, modulus, and heat stability....