乙烯醇
结晶度
混溶性
极限抗拉强度
淀粉
材料科学
化学工程
醋酸乙烯酯
三乙胺
氢键
化学
高分子化学
聚合物
共聚物
复合材料
有机化学
分子
工程类
作者
Kanda Junlapong,Phetdaphat Boonsuk,Chiraphon Chaibundit,Sirinya Chantarak
标识
DOI:10.1016/j.ijbiomac.2019.06.223
摘要
Biodegradable films were prepared based on cassava starch (CS) and poly(vinyl alcohol) (PVA). To increase its tensile strength and flexibility, CS (20-60 wt%) was blended with PVA at various weight ratios (80-40 wt%). Triethylamine (TEA) was added as a homogeneous catalyst to increase intermolecular interaction and induce miscibility between CS and PVA. The crystallinity and hydrophobicity of blend films containing 20 wt% CS were promoted by the elimination of residual acetate groups in PVA. The number of hydrogen bonds in these blend films increased, which led to stronger interaction and more compact molecular packing between CS and PVA chains. The poor water resistance that limits the shelf-life and applications of CS blends was improved. The addition of TEA to blend films containing 20 wt% CS increased water resistance by 80% and tensile strength by as much as 440%. The development of greater structural integrity yielded ecologically sustainable, low-cost, biodegradable films with excellent physical and mechanical properties.
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