羟乙基化双酚A环氧树脂的合成与性能研究

Synthesis and properties of diglycidyl ether of ethoxylated bisphenol-A

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。

A low viscosity epoxy resin named diglycidyl ether of ethoxylated bisphenol - A （ DGEBAEO - 2. 25 ） was synthesized by one - step method using solid sodium hydroxide as catalyst. The structure of DGEBAEO - 2. 25 was characterized by FT - IR, 1H - NMR, and GPC. The DGEBAEO - 2.25 was cured by 4, 4＇ - diamino di- phenyl sulfone （DDS）. The viscosity, curing reactivity, thermal and mechanical properties of the DGEBAEO - 2. 25 system were investigated by comparison with the diglycidyl ether of bisphenol - A （ DGEBA, epoxy value 0. 51 ） system. The results showed that DGEBAEO - 2.25 had lower viscosity which was one seventh of DGEBA and the curing reactivity and glass transition temperature were lower than that of DGEBA. The toughness of the cured product was significantly improved and the impact strength was two times higher than that of DGEBA . The tensile, flexural strength and modulus were essentially unchanged.