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引进一种碳纳米管的分散剂纤维素硝酸酯,研究纤维素硝酸酯在MWCNTs/PMMA复合体系中的助分散作用和可能的机理。通过观察MWCNTs在液体中的沉降情况评价纤维素硝酸酯的助分散效果;采用原位本体聚合法制备MWCNTs/PMMA复合材料并测试其耐划痕性和硬度。观察实验显示,酸处理和未酸处理的MWCNTs均能够稳定地悬浮于含有纤维素硝酸酯的MMA溶液中。测试结果表明,含有纤维素硝酸酯的酸处理MWCNTs/PMMA复合材料的耐划痕性比纯PMMA的提升了67%,布氏硬度提升了14%。纤维素硝酸酯的使用解决了MWCNTs在基体单体MMA中的沉降问题,其助MWCNTs分散作用优良。
The introduction of a carbon nanotube dispersant cellulose nitrate, cellulose nitrate in the MWCNTs / PMMA composite system and its possible mechanism of dispersion. MWCNTs / PMMA composites were prepared by in situ bulk polymerization and their scratch resistance and hardness were tested by observing the settling of MWCNTs in the liquid. Observation experiments showed that both the acid-treated and non-acid treated MWCNTs could be stably suspended in the MMA solution containing cellulose nitrate. The test results show that the scratch resistance of acid treated MWCNTs / PMMA composites containing cellulose nitrate is 67% more than pure PMMA and the Brinell hardness is increased by 14%. The use of cellulose nitrate solves the problem of MWCNTs settling in the matrix monomer MMA, which contributes to the excellent MWCNTs dispersion.