PP/MWNTs复合材料的动态力学性能及热稳定性研究  

Study on Dynamic Mechanical Properties and Thermal Stability of PP/MWNTs Composites

作　　者：李丽霞 任金忠 孙会娟 刘洁晶 曹建蕾 Li Lixia;Ren Jinzhong;Sun Huijuan;Liu Jiejing;Cao Jianlei(Hengshui University Department of Applied Chemistry,Hengshui 053000,China)

机构地区：[1]衡水学院应用化学系

出　　处：《塑料科技》2018年第9期40-45,共6页Plastics Science and Technology

基　　金：河北省科技计划自筹经费项目(16211242);衡水市科技计划项目(2016011006Z);衡水市科技计划项目(2016011003Z)

摘　　要：采用熔融共混法制备了不同质量分数的聚丙烯/多壁碳纳米管（PP/MWNTs）复合材料,研究了MWNTs的含量对复合材料的拉伸、冲击等力学性能及动态力学性能的影响,并利用热重法研究了复合材料的热稳定性,采用Kissinger法计算了复合材料的热降解动力学参数。结果显示：MWNTs的质量分数为1.5%时,复合材料的拉伸强度较纯PP提高了13.6%,冲击强度提高了56.1%;MWNTs含量为2%时,复合材料的储能模量达到最大,含量为1.5%时损耗模量达到最大,随着MWNTs含量的增加,内耗峰强度呈先增大后减小的趋势,在含量为1.5%时达到最大值;TG和DTG曲线表明,MWNTs的含量为1.5%时,起始降解温度较纯PP提高最多,且活化能最大,说明显著提高了复合材料的热稳定性。Different mass fraction of polypropylene/multi-walled carbon nanotubes（PP/MWNTs）composites were prepared by melt blending, the effects of MWNTs content on mechanical properties and dynamic mechanical properties of composites were studied, the thermal stability of composites were studied by thermal weight method, and the thermal degradation kinetics parameters of composites were calculated by using the Kissinger method. The results showed that the tensile strength of the composites increased by 13.6% and the impact strength increased by 56.1% when the mass fraction of MWNT was 1.5%, the energy storage modulus of the composites reached maximum when the MWNTs content was 2%, the loss modulus reached the maximum when the content was 1.5%, and the internal friction peak intensity first increased and then decreased with the increased of the content of MWNT, which reached the maximum when the content was 1.5%. The TG and DTG curves showed that the content of MWNTs was 1.5%, the initial degradation temperature was higher than that of pure PP, and the activation energy was the largest, indicating that the thermal stability of the composites was significantly improved.

关 键 词：聚丙烯 多壁碳纳米管 复合材料 动态力学性能 热稳定性 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]