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采用非等温差示扫描量热法(DSC)研究了一种长侧链取代液晶环氧单体与甲基六氢苯酐的固化反应历程,考察了体系的固化反应动力学特征。并通过POM、WAXD、SEM、TGA和DMA等对其等温固化产物的相结构、热性能和动态力学性能等进行表征和分析。结果表明,侧链的存在使其固化反应具有良好的可控性。固化反应活化能为77.8 kJ/mol,固化反应后期为扩散控制。液晶环氧单体经固化后呈向列相,其力学和耐热性能优良,韧性也得到明显改善。
The curing reaction of a long chain substituted liquid crystal epoxy monomer with methylhexahydrophthalic anhydride was studied by non-isothermal differential scanning calorimetry (DSC). The kinetics of the curing reaction was investigated. The phase structure, thermal properties and dynamic mechanical properties of the isothermal cured products were characterized and analyzed by POM, WAXD, SEM, TGA and DMA. The results show that the presence of side chain makes the curing reaction has good controllability. The curing reaction activation energy is 77.8 kJ / mol, and the curing reaction is controlled by diffusion. Liquid crystal epoxy monomer is nematic phase after curing, its mechanical and heat resistance, toughness has also been significantly improved.