HIPS/MWCNT和HIPS/GE复合材料的动态热力学性能及热降解动力学研究

Dynamic mechanical properties and thermal degradation kinetics of HIPS/MWCNT and HIPS/GE composites

利用熔融共混法制备了高抗冲聚苯乙烯(HIPS)/多壁碳纳米管(MWCNT)和HIPS/石墨烯(GE)复合材料,测试了其力学性能和动态力学性能,利用热重法研究了复合材料在氮气和氧气中的热降解行为,并采用Kissinger和Friedman两种方法计算了热降解动力学参数。结果表明:与GE相比,MWCNT对HIPS力学性能有较大的提升作用,拉伸强度和冲击强度分别提高了26.6%,74.6%;HIPS/MWCNT复合材料的储能模量和玻璃化转变温度较纯HIPS有一定提高;GE对HIPS动态力学性能没有明显影响;加入MWCNT能有效延缓HIPS的热降解过程,提高HIPS的高温热稳定性;GE对HIPS热降解的影响不显著;Kissinger和Friedman两种方法计算得到的降解活化能变化趋势一致。

High impact polystyrene(HIPS)/multiwalled carbon nanotube(MWCNT)and HIPS/graphene(GE)composites were prepared via melt blending method,whose mechanical properties and dynamic mechanical properties were tested.The thermal degradation behavior of HIPS/MWCNT and HIPS/GE composites in nitrogen and oxygen were studied by thermogravimetric method,and whose kinetic parameters of thermal degradation were calculated by Kissinger and Friedman methods.The results show that the tensile strength and impact strength of HIPS/MWCNT are increased by 26.6%and 74.6%respectively than those of HIPS/GE.The storage modulus and glass transition temperature of HIPS/MWCNT composites are improved compared with those of pure HIPS.GE has no significant effect on dynamic mechanical properties of HIPS.The addition of MWCNT delays effectively the thermal degradation process of HIPS,hence improve the thermal stability of HIPS at high temperature.The effect of GE on the thermal degradation of HIPS is not significant,and the activation energy values of degradation calculated by Kissinger and Friedman are consistent.