Abstract
Surface modification of carbon nanotubes by multi monomer (glycidyl methacrylate and styrene) grafting polystyrene (PS-g-(GMA-co-St)) sheathing was carried out.First,Multi-wall carbon nanotubes (MWNTs) was functionalized by a mixture of concentrated sulfuric and nitric acids (3∶1,by volume).As a result,many carboxylic acid groups were created in MWNTs.Carboxylic MWNTs were then mixed with PS-g-(GMA-co-St)/THF solution,and the esterification reaction occurred between carboxylic acid groups of the MWNTs and epoxy groups of PS-g-(GMA-co-St),leading PS-g-(GMA-co-St) grafting onto MWNTs.SEM observation shows that the average diameter of the grafted MWNTs from polymer solution is about 100 nm,larger than the average diameter of about 40 nm for the neat carboxylic or grafted MWNTs,implying that the MWNTs can be sheathed with polymer after modification.After solvent etching through THF,the average diameter of the grafted MWNTs decreased to about 40 nm again,indicating the polymer sheathing can be washed up.Otherwise,after washing-up,FT-IR measurements confirmed that a little polymer still remained on the carboxylic nanotubes.
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