分别采用端羟基、端羧基和端环氧基聚丙二醇对环氧树脂进行增韧改性，对改性环氧树脂固化物进行了DMA、冲击性能和冲断面SEM研究。随端羟基聚丙二醇用量的增加环氧树脂玻璃化转变温度先降低后增加，而且出现了分相结构；采用端羧基聚丙二醇增韧体系相容性有所增加，在较高添加量时才出现分相结构；端环氧基聚丙二醇在添加量范围内未出现相分离。采用3种增韧剂改性的环氧树脂的断裂冲击强度变化与体系相容性变化存在一致性。研究表明，端羟基聚丙二醇通过外增塑方式增加环氧树脂韧性，而端环氧基聚丙二醇通过内增塑的方式提高环氧树脂韧性。
Hydroxy-terminated polypropylene glycol,carboxyl-terminated polypropylene glycol and epoxy-termi-nated polypropylene were used to modifiy epoxy resin.Dynamic mechanical thermal analysis,impact strength and scanning electron microscopy were used to study the modified epoxy resin.The glass transition temperature (Tg )of epoxy resin firstly increased and then decreased as the adding amount of hydroxy-terminated polypropyl-ene glycol increased,and phase seperation appeared.The compatibility increased when carboxyl-terminated poly-propylene glycol was used as modifier,and phase seperation appeared in larger adding amount.Phase separation didn’t exist when epoxy-terminated polypropylene was used.The variation of impact strength of three different modified epoxy resin consisted with the variation of phase seperation of modified epoxy resin.Test results show that the toughness of epoxy resin is enhanced by way of plasticization when adding hydroxy-terminated polypro-pylene glycol and when adding epoxy-terminated polypropylene glycol,the toughness is enhanced by way of in-creasing the flexibility of the crosslinked networks.
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