Micro-sized silica gel particles were first surface-modified with coupling agent -aminopropyltrimethoxysilane (AMPS) for obtaining the modified particles SiO2-AMPS

on which primary amino groups were chemically attached.Subsequently

the Schiff base reaction between SiO2-AMPS particles and 4-(diethylamino)salicylaldehyde (DEAS) was allowed to carried out

resulting in the modified particles SiO2-DEAS

on which aryl tertiary amine moieties were bonded.So a redox initiation system was constituted with the aryl tertiary amine moieties on the surfaces of SiO2-DEAS particles and benzoyl peroxide (BPO) in a solution

and the surface-initiated grafting of styrene(St) was realized

and the grafted particles SiO2-DEAS-g-PSt with a high grafting degree of 27 g/100g were prepared.The grafted particles SiO2-DEAS-g-PSt were characterized by FTIR

SEM and TGA.In this work

the effects of some factors on the graft-polymerization of styrene were mainly investigated.The experimental results show that the graft-polymerization initiated by aryl tertiary amine-BPO system has the character of high grafting degree because of the lying of active sites on the surfaces of the support particles as compared with the method of grafting through

in which the polymerizable double bonds are first introduced onto the surfaces of the solid particles.For those oil-soluble monomers

this is a surface-initiated grafting method with a high efficiency.In order to prepare the grafted particles SiO2-DEAS-g-PSt with a high grafting degree

50℃should be selected as an suitable reaction temperature

a amount of BPO with 3 wt% of the monomer mass should be selected as an appropriate used amount of BPO in the solution

and the applicable monomer concentration is 10 wt% of the solution mass.