Preparation of nanoscale SiO_2/PSSS composite particles by in-situ polymerization and their properties

Graft modification with KH-570 was carried out on the surface of the nanoscale SiO2 which was prepared by sol-gel process and then the modified SiO2 was copolymerized with sodium styrene sulfonate( SSS) to prepare the nanoscale SiO2/ PSSS composite particles via in-situ polymerization. The effects of the amount of SSS and ammonium persulphate( APS) on the particle size of the nanoscale SiO2/ PSSS composite particles were investigated,as well as the dispersing stability of SiO2/PSSS in aqueous media. The results showed that the particle size of SiO2/PSSS composite particles was 150 nm when the weight ratio of SSS to SiO2 was 25% and APS to SSS was 1. 5%. FTIR and TEM analysis indicated that the nanoscale SiO2 was coated by PSSS,and the weight ratio of polymer was 27. 5% measured by TGA. SiO2/ PSSS composite particles have excellent dispersing stability in aqueous media.