Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
School of Chemical and Material Engineering, Beijing Technology and Business University, Beijing 100048, China.
Int J Biol Macromol. 2023 Jul 1;242(Pt 3):124716. doi: 10.1016/j.ijbiomac.2023.124716. Epub 2023 May 6.
Utilizing starch, an abundant polysaccharide, as the renewable filler to blend with poly(butylene adipate-co-terephthalate) (PBAT) is a feasible tactic to construct cost-effective and high-performance biodegradable materials. It's worth noting that the thermal processing properties of starch can be manipulated by its plasticized behavior. Herein, epoxidized soybean oil (ESO) and glycerol were used as the plasticizer for native corn starch and the plasticized starch was integrated with PBAT to manufacture starch-based biodegradable blend films. ESO breaks the hydrogen bonds between starch chains through the fatty chains grafting reaction and increases the distance between starch molecular chains due to the large molecular weight of ESO. Meanwhile, glycerol molecules are incorporated into the starch molecular chains, and fatty chains grafted starch chains, effectively reducing the intermolecular forces of molecular chains. On account of the synergistic plasticization of ESO and glycerol which possess good compatibility with PBAT, the PS blend film achieved a tensile strength, an elongation at break of 16.11 MPa and 612.09 %, and the balanced water and oxygen permeability properties.
利用淀粉这种丰富的多糖作为可再生填料与聚（己二酸丁二醇酯-对苯二甲酸酯）（PBAT）共混是构建具有成本效益和高性能的可生物降解材料的可行策略。值得注意的是，淀粉的热加工性能可以通过其塑化行为来操纵。本文采用环氧大豆油（ESO）和甘油作为天然玉米淀粉的增塑剂，将增塑后的淀粉与 PBAT 共混，制备了基于淀粉的可生物降解共混膜。ESO 通过脂肪酸链接枝反应破坏淀粉链之间的氢键，并由于 ESO 的分子量较大而增加淀粉分子链之间的距离。同时，甘油分子进入淀粉分子链和接枝淀粉链的脂肪酸链中，有效地降低了分子链之间的相互作用力。由于 ESO 和甘油具有良好的与 PBAT 的相容性，具有协同增塑作用，PS 共混膜的拉伸强度、断裂伸长率分别达到 16.11 MPa 和 612.09%，且具有平衡的水和氧气透过性能。
