颗粒Al_2O_3增强环氧树脂复合材料的微波固化动力学及性能

利用Avrami法研究了Al_2O_3颗粒及其添加量对E51/DDS体系的微波固化表观活化能的影响,采用差示扫描量热、动态力学分析、力学性能测试和扫描电子显微镜等试验手段对产物的热性能、力学性能及微观形态进行研究。结果表明,Al_2O_3颗粒增强E51/二氨基二苯砜(DDS)体系可以显著降低其微波固化的反应活化能,其中相比于未添加的体系,添加量达到40%时,其微波固化活化能降低了19.3%;加入Al_2O_3颗粒可以提高体系的玻璃化转变温度,增加幅度与添加量正相关;且体系的损耗模量随着添加量的增加而降低。拉伸和弯曲模量随着Al_2O_3添加量的增加而增加,而拉伸和弯曲强度则呈现先增加后减小的趋势。断面分析表明Al_2O_3颗粒的存在阻止了微裂纹的扩展,消耗更多的能量,提高了浇注体的力学性能。

Kinetic Analysis and Characterization of Microwave Curing Process of Epoxy Resins Reinforced with Al2O3 Particles

The Avrami method was utilized to study the effect of Al2O3 content on the apparent activation energy of microwave curing for E51/diaminodiphenyl sulfone (DDS) system.Differential scanning calorimeter method,dynamic mechanical analysis,mechanical performance test and scanning electron microscopic images were used to study the thermal properties,mechanical properties and micromorphology E51/DDS system.The results show that the addition of A12O3 could significantly reduce the activation energy of microwave curing.Compared with the nonadditive system,when the mass fraction of A12O3 reaches 40 ％,the activation energy is decreased by 19.3 ％.The glass transition temperature of E51/DDS system is improved by adding A12O3 and the increase amplitude is positively correlated with the content.The loss module decreases with the content of A12O3 caused by the particle reinforcement.The tensile and flexural module of E51/DDS system increase with increase of the A12O3 content while the tensile and flexural strength increase firstly and then decrease with the optimum additive amount of 30 ％.The fracture morphology analysis indicates that the existence of Al2O3 hinder the propagation of micro-crack and more energy is consumed,thus improving the mechanical performance of E51/DDS epoxy cast.