采用机械共混法制备了石墨烯/天然橡胶 (GE/NR)和多壁碳纳米管/天然橡胶 (MWCNT/NR)复合材料,利用热重法研究了复合材料的热降解过程,采用Kissinger、Flynn-Wall-Ozawa和Friedman这3种方法对复合材料的热降解动力学参数进行了计算。结果表明:复合材料的起始失重温度 (T0)和最大热失重速率温度 (Tm)随石墨烯和多壁碳纳米管的加入均有提高,含量分别为5份和2.5份时T0达到最大值,较NR分别提高了约15℃和10℃,Tm也有提高。3种计算方法结果显示:复合材料的活化能 (Ea)随两种材料的含量增加呈先增加后减小的趋势,在GE含量为5份、MWCNT含量为2.5份时达到最大值。从Ea数据可看出NR基体中掺杂GE和MWCNT均可提高热降解所需的能量,使NR的耐热性提高,总体效果来看,GE的提高效果更显著。
The composites based on graphene/natural rubber (GE/NR) and multi-walled carbon nanotubes/natural rubber (MWCNT/NR) were prepared by mechanical-blending method.The thermal degradation processes were investigated by a thermogravimetric method,and the kinetic parameters of thermal degradation were obtained by the Kissinger's,Flynn-Wall-Ozawa's and Friedman's methods.The results showed that the initial weightlessness temperature (T0) and the maximum thermal weightlessness rate temperature (Tm) increased with the addition of graphene and multi-walled carbon nanotubes,and when the contents were 5 and 2.5,both T0 reached a maximum which were about 15℃ and 10℃ higher than NR,respectively,Tm also improved.The results of the three calculation methods showed that the activation energy (Ea) increased first and then decreased with the increase of the two materials.The maximum values reached when the GE content was 5 and the MWCNT content was 2.5.From the datas of Ea,it can be seen that the doping of GE and MWCNT in the NR matrix can increase the energy required for thermal degradation and increased the heat resistance of NR,the overall effect of GE was more significant.
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基金资助
河北省科技计划自筹经费项目(16211242);衡水学院服务衡水地方社会经济特别支持计划(2018ZX003)
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