聚氨酯自修复薄膜材料的制备及研究

摘要

A novel thermo-induced self-healing polyurethane film material was developed.Polyethylene glycol (PEG-600) and tolylene 2,4-diisocyanate (TDI) were employed to construct the polymer main chain, and 2-furanmethanamine (FMA) and N,N'-(4,4'-methylenediphenyl) dimaleimide (BMI) were used to introduce the Diels-Alder (DA) bonds into the polymer as pedant groups.The film showed satisfactory transparency at 550 nm (transmittance 82.0% with 0.47 mm thickness).Crack on the film surface can be completely healed in 5 min at 120 ℃.And 84.7% of its original mechanical strength can be recovered.%以聚乙二醇(PEG-600)与2,4-甲苯二异氰酸酯(TDI)构建聚氨酯主链结构,在侧链引入呋喃甲胺(FMA)和4,4'-双马来酰亚胺基二苯甲烷(BMI)的Diels-Alder(DA)键,从而得到具有热致自修复性能的聚氨酯薄膜材料.该材料(0.47 mm厚度)在550 nm下具有较高的透明度(透光率82.0%).当材料出现裂纹后,在120 ℃下加热5 min可完全修复,且材料的机械强度可恢复84.7%.