超支化聚酯接枝羧酸化碳纳米管的制备、表征与性能研究

Preparation,characterization and performance of hyperbranched polyester grafted carboxylated multi-walled carbon nanotubes

采用硫酸和硝酸体积比为3∶1的混酸氧化法对多壁碳纳米管进行羧酸化处理,再将超支化聚酯H204接枝到羧酸化后碳纳米管的表面,制备超支化聚酯接枝碳纳米管。通过XPS、TGA、Raman对产物进行表征,并测试其在水和氯仿中的分散性。结果表明,羧酸化使碳纳米管的O/C值从0.076增加到0.301;酸化碳纳米管和超支化聚酯接枝碳纳米管的失重率从多壁碳纳米管的0.74%分别增长到11.34%和13.07%;Raman谱图出现蓝移现象并且ID/IG值也随着酸化、接枝改性而增加。溶解性试验发现超支化聚酯接枝多壁碳纳米管的亲水能力显著提高,放置60天后仍能稳定均匀地分散在水中。优秀的亲水性为碳纳米管在其他领域的应用创造了条件。

Multi-walled carbon nanotubes were carboxylated with mixed acids whose volume ratio of sulfuric acid/nitric acid was 3∶1,and then the hyperbranched polyester was grafted to the surface of the carboxylated MWCNTs,which was the preparation of hyperbranched polyester grafted carbon nanotubes.The products were characterized by XPS,TGA,Raman and tested for dispersibility in water and chloroform.The results showed that the O/C values of carbon nanotubes increased from 0.076 to 0.301 by carboxylation.The loss weight of carboxylated carbon nanotubes and hyperbranched polyester grafted carbon nanotubes increased from 0.74%to 11.34%and 13.07%respectively.Raman spectra appeared blue shift phenomenon and I D/I G values also increased with carboxylation and graft modification.Solubility test found that hyperbranched polyester grafted multi-walled carbon nanotubes significantly increased hydrophilicity.After 60 days,they could still be stably and evenly dispersed in water.Good hydrophilicity created the conditions for the application of carbon nanotubes in other fields.