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合成了不同层数的端羧基超支化聚合物(HBPs-COOH),其与2-甲基咪唑(2-MI),苯甲醇(BP)分别进行酰胺化反应和酯化反应得到了超支化咪唑酰胺化衍生物(HBPIAD)并将其用作环氧树脂中温固化剂。通过红外(FTIR)、动态力学热分析(DMA)、热重分析(TGA)、扫描电镜(SEM)、力学性能测试等方法对固化剂结构及环氧树脂固化物的性能进行了研究。结果表明,超支化咪唑酰胺化衍生物降低了咪唑的固化反应活性,提高了其与环氧树脂的相容性,HBPIAD-1改性后的环氧树脂固化物的力学性能有所提高,拉伸强度可达40.44 MPa,弯曲强度91.44 MPa,冲击强度12.13 kJ/m2,但是随着超支化层数的增加,环氧树脂固化物的力学性能和耐热性有所下降。
Synthesis of different levels of terminal carboxyl hyperbranched polymers (HBPs-COOH), which with the 2-methylimidazole (2-MI), benzyl alcohol (BP) were amidated and esterified to give hyperbranched imidazole Amidated derivatives (HBPIAD) and used as epoxy intermediate temperature curatives. The structure of curing agent and the properties of cured epoxy resin were studied by means of FTIR, DMA, TGA, SEM and mechanical properties test. The results showed that the hyperbranched imidazole amidated derivatives reduced the curing reactivity of imidazole and increased the compatibility with epoxy resin. The mechanical properties of epoxy resin cured by HBPIAD-1 increased Tensile strength up to 40.44 MPa, flexural strength 91.44 MPa, impact strength of 12.13 kJ / m2, but with the increase of the number of hyperbranched, the mechanical properties and heat resistance of the epoxy resin cured decreased.