Microstructure and properties of multiwalled carbon nanotubes/poly (p-phenylene benzobisoxazole) composites
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摘要: 以甲基磺酸(MSA)为溶剂通过溶液共混法制备了不同多壁碳纳米管(MWNTs)含量的多壁碳纳米管/聚亚苯基苯并二噁唑(MWNTs/PBO)复合材料, 用扫描电镜(SEM)对热处理前后复合材料的微结构进行了分析, 并对其导电、力学和耐热性能进行了研究。结果表明: MWNTs能均匀地分散在聚合物基体中, 并能形成一定的网络结构, 热处理后的复合材料较热处理前的结构更致密, 导电性能和力学性能都有所改善, 其中MWNTs质量分数为10％的热处理后复合材料与纯PBO聚合物相比, 体积电阻率降低约9个数量级, 而拉伸强度和拉伸模量分别提高了95％和53％, 耐热性能也有一定的提高。
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关键词:
- 聚亚苯基苯并二噁唑(PBO) /
- 多壁碳纳米管(MWNTs) /
- 复合材料 /
- 微结构 /
- 性能
Abstract: Multiwalled carbon nanotubes/poly (p-phenylene benzobisoxazole) (MWNTs/PBO) composites was prepared by solution blending in MSA solvent. The microstructures of MWNTs/PBO composites were characterized with SEM. The electrical, mechanical and thermal resistance properties of the composites before and after heat treatment were studied. The results show that MWNTs are dispersed uniformly in PBO matrix, and form a network microstructure that can be improved by heat treatment. Compared to MWNTs/PBO composites before heat treatment, the electrical and mechanical properties of the composites after heat treatment are enhanced. The experiments also indicate that the electronic resistivity of 10wt% MWNTs composite after heat treatment reduces approximately nine orders of magnitude over pure PBO polymer, but the tensile strength and modulus increase by 95% and 53%, respectively. MWNTs can obviously improve the thermal resistance of the composites. -
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