Key Laboratory of Advanced Materials of Tropical Island Resources Ministry of Education, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China.
College of Food and Biological Engineering, Jimei University, Xiamen 361021, Fujian, China.
Carbohydr Polym. 2021 Feb 15;254:117427. doi: 10.1016/j.carbpol.2020.117427. Epub 2020 Nov 23.
This paper reports a strategy for preparing polyether polyols from corn starch, with (i) a mixture of polyethylene glycol 400 and glycerin (7:3, w/w) as the liquefying solvent and (ii) a spent-coffee-derived solid-acid catalyst (SC-SAC) (1:10, w/w, SC-SAC/starch) at 433 K for 1.5 h, under which conditions the liquefaction yield exceeded 99 %. The SC-SAC was prepared via hydrothermal carbonization at 453 K for 12 h, followed by sulfonation with HSO at 343 K for 10 h. The liquefied starch product (SLP) was then used to plasticize poly(vinyl alcohol) (PVA) films with various mixing ratios. The optimal 0.4 SLP/PVA blend film exhibited good mechanical properties (tensile strength 38.07 MPa, elongation at break 1199 %), good transparency, and excellent flexibility. The results highlight the possibility of using SLP/PVA films in the development of degradable packaging materials.
本文报道了一种从玉米淀粉制备聚醚多元醇的策略，使用（i）聚乙二醇 400 和甘油（7:3，w/w）的混合物作为液化溶剂，（ii）一种来源于废咖啡的固体酸催化剂（SC-SAC）（1:10，w/w，SC-SAC/淀粉），在 433 K 下反应 1.5 小时，在此条件下液化产率超过 99%。SC-SAC 通过在 453 K 下水热碳化 12 小时，然后在 343 K 下用 HSO3 磺化 10 小时制得。然后将液化淀粉产物（SLP）与聚（乙烯醇）（PVA）以不同的混合比塑化制备成薄膜。最佳的 0.4 SLP/PVA 共混膜表现出良好的机械性能（拉伸强度 38.07 MPa，断裂伸长率 1199%）、良好的透明度和优异的柔韧性。结果表明，SLP/PVA 薄膜有望用于开发可降解包装材料。
