以混合芳胺为固化剂,通过聚氨酯(PU)对4,5-环氧环己烷-1,2-二甲酸二缩水甘油酯(TDE-85)与二酚基丙烷缩水甘油醚(E-51)环氧树脂的混合树脂体系(EP)的改性,制备得到了一种高性能聚氨酯改性环氧树脂(PU/EP).通过对材料样品结构的红外光谱袁征,探讨了PU/EP的固化反应机理.研究结果表明,PU预聚体与1,4-丁二醇(1,4-BDO)及三羟甲基丙烷(TMP)发生了扩链、交联反应得到PU交联聚合物网络,TDE-85/B51环氧树脂与混合芳胺固化剂反应生成了交联环氧聚合物.EP与PU之间存在的化学接枝、交联反应,提高了EP与PU之间的相容性及共混程度.
With polyurethane(PU) modification of the epoxy resin (EP) blend of phenol-based epoxy propane (E-51) and diglycidyl-4, 5-epoxycyclohexane-1,2-dicarboxylate (TDE-85), the modified epoxy resin system(PU/EP) was formed using mixed aromatic amine as curing agent. By the infrared spectrum analysis, the curing mechanism of the PU/EP system was discussed. The results indicate that the polyurethane networks are formed by the reactions of chain-extending and cross-linking. The reaction of chain-extending generates between polyurethane prepolymer (PUP) and 1,4-BDO, and the cross-linking reactons occurs between PUP and TMP. The EP polymer networks are obtained by the reactions between EP and the aromatic amine. By the reactions between PU and epoxy resin(EP), the graft chemical bond is formed, which effectively enforces the miscibility of the PU/EP system.
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