超临界二氧化碳协助制备功能性PVA/CNT/Pd多级复合纳米材料

Fabrication of PVA/CNT/Pd Functional Hybrid Nanocomposite with Assistance of Supercritical CO_2

聚乙烯醇(PVA)是分子主链含有—CH2—CH(OH)—基团的高聚物,通过聚醋酸乙烯酯水解得到的水溶性高分子树脂。本工作在超临界CO2的辅助下使用聚乙烯醇来修饰碳纳米管(CNTs),目的是增强CNTs在水中的分散性。进一步利用这种PVA修饰过的CNTs作为催化剂载体,负载金属钯的纳米晶体颗粒,通过调节超临界CO2的压力以及控制反应过程中的磁力搅拌条件,实现了对PVA/CNT/Pd复合材料中钯纳米晶体形貌的控制,为研究水介质Suzuki coupling反应(铃木偶合反应)寻求一条新的道路。

Polyvinyl alcohol （PVA） which could get through hydrolysis reaction of polyvinyl acetate is a water-soluble polymer resin containing --CH2--CH （OH）-groups in the main chain. In this study, polyvinyl alcohol （PVA） was used to enhance the solubility of carbon nanotubes （CNTs） in water, and then this PVA/CNTs composites were treated as a catalyst carrier to load metal particles of palladium nanocrystals. By changing the SC CO2 pressure conditions and magnetic stirring, we can get PVA- modified CNTs and further achieve controllable morphology of palladium nanocrystals in PVA/CNT/Pd nanocomposite.