蓖麻油基聚氨酯光固化薄膜的制备及自修复性能

Preparation and Self-healing Properties of Castor Oil-based Polyurethane Photocurable Films

以蓖麻油为原料,通过酰胺化反应制备新型CODEA单体,随后将其与异佛尔酮二异氰酸酯、甲基丙烯酸羟乙酯、2,2’-二硫二乙醇或双(4-羟苯基)二硫醚(HEDS或HPDS)合成了双键封端的预聚物,在UV条件下制备了具有自修复功能的薄膜材料。通过红外、核磁、热机械分析、热重分析和拉伸测试等手段对制备材料进行了结构、热性能和机械性能表征。研究发现,二硫键的引入可赋予材料优异的自修复性能,特别是当CODEA-HEDS的含量为12%时,其表现出较佳的自修复性能,拉伸强度达18.3 MPa,并且首次修复后仍能承受500 g的拉力,在多次自修复后该固化膜的断裂伸长率和拉伸强度仍可恢复到初始值的73.8%和46.4%。此外,对相同质量的CODEA-HPDS来说,其自修复性能明显优于CODEA-HEDS的,经过多次修复后,其断裂伸长率和拉伸强度可恢复到初始值的76.1%和55.8%。总之,此工作为制备具有优异自修复性能的生物质材料提供了理论依据。

Castor oil was used as raw material to prepare a new CODEA monomer by amidation reaction,and then it was combined with isophorone diisocyanate,hydroxyethyl methacrylate,2,2'-disulfide diethanol or bis(4-hydroxyphenyl)disulfide to synthesize a double-bonded prepolymer,and a self-healing film was prepared under UV conditions.The structure,thermal and mechanical properties of the prepared materials were characterized by infrared,nuclear magnetic,thermal-mechanical analysis,thermogravimetric analysis,and tensile test.It was found that the introduction of disulfide bond could give the material excellent self-healing properties,especially when the content of CODEA-HEDS was 12%,it showed better self-healing properties,tensile strength of 18.3 MPa,and could still withstand 500 g tension after the first repair.After multiple self-repairs,the elongation at break and tensile strength of the cured film could still recover to 73.8%and 46.4%of the initial values.In addition,for CODEA-HPDS of the same quality,its self-healing performance was significantly better than that of CODEA-HEDS.After multiple repairs,its elongation at break and tensile strength could be restored to 76.1%and 55.8%of the initial values.In summary,this work provided a theoretical basis for the preparation of biomass materials with excellent self-healing performance.