【摘要】 讨论了添加量为1%(Per hundreds of resin)的咪唑改性的氧化石墨烯(GO-IPDI-MZ)对磷质量分数为1.5%的环氧树脂体系(1.5P-D-U-EMI)固化的影响.差示扫描量热法(DSC)研究结果表明,当GO-IPDI-MZ添加量为1%时不会改变1.5P-D-U-EMI的非等温自催化固化反应特征.添加1%GO-IPDI-MZ的磷质量分数为1.5%的环氧树脂(1.5P-D-GOM-1)的固化起始温度(Tonset)和峰顶温度(Tp)均比1.5P-D-U-EMI体系低,而总的固化热(ΔH)比1.5P-D-U-EMI体系高.说明GO-IPDI-MZ添加量为1%时,对环氧体系起到一定的促进固化和共固化作用.等温DSC分析表明,在固化反应后期,体系出现了玻璃化转变现象,在此阶段,含扩散控制因子的Kamal模型预测结果与实验结果吻合较好.GO-IPDI-MZ的加入使固化反应相对均匀地进行,对固化反应会产生促进和共固化作用.更多还原

【Abstract】 The curing kinetics of a flame-retardant epoxy resin( 1. 5P-D-U-EMI) containing 9,10-dihydro-9-oxa-10-phosphaphenantrene-10-oxide( DOPO) with imidazole grafting graphene oxide( GO-IPDI-MZ) was investigated by differential scanning calorimetry. The non-isothermal autocatalysis curing mechanism of1. 5P-D-U-EMI was not changed by adding 1% of GO-IPDI-MZ. Tonsetand Tpof the flame-retardant epoxy resin with 1 Phr of GO-IPDI-MZ( 1. 5P-D-GOM-1) were decreased compared with those of 1. 5P-D-U-EMI,and the total curing heat ΔH of 1. 5P-D-GOM-1 was higher than that of 1. 5P-D-U-EMI. 1% of GO-IPDI-MZ plays a catalytic and co-curing action on the epoxy system. The phenomenon of diffusion control was observed at the later stage of isothermal curing,especially at low temperatures. The Kamal-Sourour model modified with diffusion expressed the observed reaction rate curves fairly well. The curing reaction became steady and uniform by introducing GO-IPDI-MZ.更多还原