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采用均苯四甲酸酐(PMDA)和过氧化二苯甲酰(BPO)双固化剂固化聚丁二烯环氧树脂(ELPB),制备了ELPB/PMDA/BPO耐高温胶粘剂。研究结果表明,BPO对PMDA固化ELPB体系中环氧基团的固化反应没有影响,但对ELPB体系中双键的固化反应影响显著,并进一步促进了胶粘剂中互穿聚合物网络(IPN)的形成;由于交联密度的提高,ELPB/PMDA/BPO胶粘剂的耐热性能增加(耐热温度提高8℃左右),但固化物的脆性也随之增大,导致对铝/铝合金的剪切强度从15MPa左右降低至13MPa左右。
ELPB / PMDA / BPO high temperature adhesive was prepared by curing polybutadiene epoxy resin (ELPB) with pyromellitic anhydride (PMDA) and dibenzoyl peroxide (BPO) The results show that BPO has no effect on the curing reaction of the epoxy groups in the PMDA-cured ELPB system, but has a significant effect on the curing reaction of the double bond in the ELPB system and further promotes the formation of the IPN in the adhesive ; Due to the increase of crosslinking density, the heat resistance of ELPB / PMDA / BPO adhesive increases (the heat-resistant temperature increases by about 8 ℃), but the brittleness of the cured product also increases, resulting in the increase of the shear strength of aluminum / aluminum alloy Reduced from about 15MPa to about 13MPa.