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使用固体NaOH为催化剂,通过一步法合成了低粘度的羟乙基化双酚A环氧树脂(DGEBAEO-2.25),并利用FT-IR,1H-NMR,GPC对产物的结构进行了表征。采用4,4’-二氨基二苯砜(DDS)固化DGEBAEO-2.25,通过与双酚A环氧树脂(DGEBA,环氧值0.51)体系的比较,研究了DGEBAEO-2.25体系的粘度、固化活性、热性能及力学性能。结果表明,DGEBAEO-2.25的粘度仅为DGEBA的1/7;固化活性及玻璃化温度降低;固化物韧性明显提高,冲击强度提高2倍多,且拉伸、弯曲强度和模量基本保持不变。
Low molecular weight hydroxyethylated bisphenol A epoxy resin (DGEBAEO-2.25) was synthesized by one-step method using solid NaOH as catalyst. The structure of the product was characterized by FT-IR, 1H-NMR and GPC. DGEBAEO-2.25 was cured with 4,4’-diaminodiphenyl sulfone (DDS). The viscosity and curing activity of DGEBAEO-2.25 system were studied by comparison with bisphenol A epoxy resin (DGEBA, epoxy value 0.51) , Thermal and mechanical properties. The results showed that the viscosity of DGEBAEO-2.25 was only 1/7 that of DGEBA, the curing activity and glass transition temperature decreased, the toughness of the cured product increased obviously, the impact strength increased more than two times and the tensile strength, flexural strength and modulus remained unchanged .