溶液共混法制备高强度淀粉基完全生物降解塑料薄膜

Fully Biodegradable Starch Based Film with High Strength Prepared by Solution Mixing Method

利用一步溶液共混法,将预糊化的淀粉糊与PVA溶液共混,用乙二醛进行交联,制备淀粉／聚乙烯醇(PVA) 完全生物降解塑料薄膜。研究不同乙二醛和甘油的用量对薄膜性能的影响。薄膜的力学性能、热性能和微观形态表征表明,淀粉／PVA体系具有较好的相容性和较高的力学性能,薄膜的拉伸强度和断裂伸长率分别可达到28．52 MPa 和307．5％。

Fully biodegradable film of starch/poly（vinyl alcohol） was prepared via one-step solution mixing method, in which glyoxal was introduced directly into the mixture of pregelatinized starch paste and poly（vinyl alcohol） solution as a erosslinker. The effect of volume fraction of glyoxal and glycerin on plastic film＇s properties was studied. The starch/poly（vinyl alcohol） blend possessed better compatibility and higher mechanical properties. The film＇ s tensile strength and elongation at break was 28.52 MPa and 307.5 %, respectively.