In order to avoid the corrosion

pollution

and the serious break of carbon nanotubes (CNTs)

Diels-Alder (DA) ［4 + 2］ cycloadditions on the sp2 carbons of CNTs are used for the introduction of functional groups that allow the attachment of potential initiator moieties of ATRP.The multi-walled carbon nanotubes (MWNTs) based initiator of ATRP was synthetized by using a DA reaction between MWNTs and furfuryl-2-bromoisobutyrate obtained via esterification reaction.The MWNTs-initiator (MWNTs-Br) with controlled grafted content by changing the conditions of the DA reaction was used to initiate the polymerization of acrylate-POSS on the MWNT surface.The thickness of acrylate-POSS coated onto MWNTs can be changed by controlling the grafted degree of MWNTs-Br.Finally

a core-shell structure with MWNT at the center was obtained successfully and the thickness of shell can be adjusted from about 5

10

to 15 nm through choosing different initiators.The multifunctional molecules coated MWNTs have better compatibility with other polymer matrix and it provides a potential application for the preparation of composite materials based on CNT chemistry.