羧基丁腈橡胶改性环氧树脂制备及性能

Preparation and Properties of CTBN Modified Epoxy Resin

用羧基液体丁腈橡胶(CTBN)对环氧树脂(EP)进行改性,先生成EP/CTBN预聚物,再以651聚酰胺树脂及一定量的聚醚胺作为内增韧型固化剂固化成型。采用红外光谱对预聚物进行结构表征,测试了不同CTBN含量改性EP固化后的冲击强度、拉伸剪切强度、玻璃化转变温度、外观、断裂形貌。结果表明,EP中的环氧基与CTBN中的羧基发生反应,CTBN接枝到EP上。随着CTBN含量增加,改性EP的冲击强度和拉伸剪切强度都有明显提高,断裂形貌呈现出韧性断裂特征,增韧效果显著。当CTBN质量分数为15%时,拉伸剪切强度最大,比未改性时提高了34.6%。当CTBN质量分数为25%时,增韧EP的同时耐热性并没有降低。

Liquid carboxyl terminated butadiene nitrile rubber(CTBN)was used to modify epoxy resin(EP).CTBN/EP prepolymer was prepared and then cured with 651 polyamide resin and a certain amount of polyether amine as internal toughening curing agent.The structure of the prepolymer was characterized by infrared spectroscopy.The impact strength,tensile shear strength,glass transition temperature and appearance fracture morphology of the cured EP modified with different content of CTBN were tested.The results show that the epoxy group in EP reacts with the carboxyl group in CTBN,and CTBN is grafted onto EP.With the increase of CTBN content,the impact strength and tensile shear strength of the modified EP are significantly improved,and the fracture morphology shows the characteristics of ductile fracture,and the toughening effect is significant.When CTBN mass fraction is 15%,the tensile shear strength reaches the maximum,which is 34.6%higher than that of unmodified CTBN.When the mass fraction is 25%,the toughening of EP does not decrease the heat resistance.