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凭借偶联剂γ-(甲基丙烯酰氧)丙基三甲氧基硅烷的媒介作用,在溶液聚合体系中,采用“接出”(“graft from”)法将单体甲基丙烯酸二甲氨基乙基酯(DMAEMA)接枝于硅胶微粒表面,制得了接枝微粒PDMAEMA/SiO2,重点考察了主要因素对接枝聚合的影响,并测定了接枝微粒的Zeta电位,初步考察了其吸附特性。研究结果表明,已接枝到硅胶表面的聚合物层,会对后续的接枝聚合产生阻隔作用;温度及引发剂用量等因素显著影响接枝度,在适宜条件下可制得接枝度为22g/100g的接枝微粒;在较大的pH范围内,接枝微粒的Zeta电位为较大的正值,在静电相互作用下,接枝微粒对铬酸根离子会产生强吸附作用.
With the intermediary function of coupling agent γ- (methacryloyloxy) propyltrimethoxysilane, the monomer methyl (methyl methacrylate) is polymerized in a solution polymerization system using the “graft from” method (DMAEMA) was grafted on the surface of silica gel particles to prepare PDMAEMA / SiO2 grafted particles, focusing on the main factors affecting the graft polymerization, and measured the zeta potential of grafted particles, a preliminary study Its adsorption properties. The results showed that the polymer layer grafted onto the surface of silica gel would block the subsequent graft polymerization. The temperature and amount of initiator significantly affected the degree of grafting. Under appropriate conditions, the grafting degree was 22g / 100g grafted particles; in a large pH range, the zeta potential of the grafted particles is a larger positive value, under the electrostatic interaction, the grafted particles have a strong adsorption of chromate ions.