石墨烯/PMMA和多壁碳纳米管/PMMA复合材料的热降解动力学研究  

Thermal Degradation Kinetics of Graphene/PMMA and Multiwall Carbon Nanotubes/PMMA Composites

作　　者：李丽霞 LI Li-xia(Department of Applied Chemistry,Hengshui University,Hengshui 053000,China)

机构地区：[1]衡水学院应用化学系,河北衡水053000

出　　处：《塑料科技》2020年第6期33-38,共6页Plastics Science and Technology

基　　金：河北省科技计划自筹经费项目(18211235);衡水市科技计划项目(2019014024Z,2019011005Z);衡水学院服务衡水地方社会经济特别支持计划(2018ZX003)。

摘　　要：利用热重法研究了石墨烯(GE)和多壁碳纳米管(MWCNTs)对聚甲基丙烯酸甲酯(PMMA)热稳定性的影响,并采用Kissinger法、Friedman法和Coats-Redfern法计算了复合材料的热降解动力学参数。结果表明:PMMA的热失重包含两个失重阶段,添加GE和MWCNTs并没有改变PMMA的热失重历程,但是T0、Tm和Tp均随MWCNTs含量的增加呈先增大后减小的趋势,添加量为3%时达到最大,分别较纯PMMA提高了57.23、14.13和20.55℃,而GE的添加没有明显提高PMMA的热稳定性。三种计算方法得到的复合材料的热降解活化能(Ea)随填料含量增加变化趋势一致,在MWCNTs含量为3%、GE含量为4%时,Ea值分别达到最大值,Friedman法计算的PMMA的反应级数为1.6,GE/PMMA复合材料的平均反应级数为1.9,MWCNTs/PMMA复合材料的平均反应级数为1.5。The effects of graphene(GE)and multiwall carbon nanotubes(MWCNTs)on the thermal stability of PMMA were studied by means of thermogravimetric method,and the thermal degradation parameters of composites were calculated by using Kissinger method,Friedman method and Coats-Redfern method.The results showed that the thermal weightlessness of PMMA contained two weightlessness peaks,after adding GE and MWCNTs,it did not change the thermal weightlessness process of PMMA,but T0,Tm,and Tp were all increased and then decreased with the increase of MWCNTs.The maximum was reached when the amount of addition was 3%,which was 57.23,14.13,and 20.55℃higher than that of pure PMMA,respectively,while the addition of GE did not significantly improve the thermal stability of PMMA.The thermal degradation activation energy(Ea)of the composites obtained by the three calculation methods has the same trend,when the GE content was 4%and the MWCNTs was 3%,the Ea value reached the maximum value,and the reaction level of PMMA calculated by Friedman method was 1.6,the average reaction level of GE/PMMA composites was 1.9,and the average reaction level of MWCNTs/PMMA composites was 1.5.

关 键 词：石墨烯 多壁碳纳米管 聚甲基丙烯酸甲酯 复合材料 热降解动力学 

分 类 号：TQ235.1[化学工程—有机化工] TB332[一般工业技术—材料科学与工程]