环氧树脂/聚苯醚体系的固化行为及相容性研究

Studies on curing behavior and compatibility of epoxy resin /polyphenylene ether system

本文研究了2种不同分子质量聚苯醚(PPE)与环氧树脂(EP)体系的固化行为以及体系的相容性。结果表明:低分子质量聚苯醚(L-PPE)与环氧树脂的固化反应活性远高于高分子质量聚苯醚(H-PPE)。环氧树脂/高分子质量聚苯醚体系的相容性较差,固化物发生明显的相分离;环氧树脂/低分子质量聚苯醚体系具有良好的相容性,固化体系相态均一,具有单一的玻璃化温度。随着低分子质量聚苯醚含量的增加,环氧树脂/低分子质量聚苯醚体系的玻璃化温度升高,tanδ峰增强、固化温度升高、固化反应热减少。

Curing behavior and compatibility of epoxy resins and two polyphenylene ethers（PPE） with different mo- lecular weight were studied by infrared spectroscopy, differential scanning calorimetry, scanning electron microsco- py and dynamic mechanical thermal analyzer. The results showed that the reactivity of low molecular weight PPE （ L - PPE） and epoxy（EP） was far higher than that of high molecular weight PPE（ H - PPE） and epoxy. The compat- ibility between EP and H - PPE was poor and the phase separation phenomenon of cured product was obvious. The EP/L- PPE system showed homogenous phase and single glass transition temperature（ Ts ） due to the better com- patibility of EP and L - PPE. The Tg, tan δ peak and curing temperature of EP/L - PPE system were increased and the curing reaction heat of EP/L - PPE system was decreased with the increasing of L - PPE content.