SiO2表面RAFT接枝聚合苯乙烯

RAFT Grafting Polymerization of Styrene on the Surface of SiO2

摘要: 基于纳米SiO2表面羟基与γ-甲基丙烯酰氧基丙基三甲氧基硅烷间的偶联反应，在纳米SiO2表面引入可聚合双键。采用可逆加成断裂链转移（RAFT）聚合技术，以偶氮二异丁腈为引发剂，使SiO2表面接枝聚合苯乙烯。考察了二硫代苯甲酸异丁腈酯、二硫代苯甲酸苄酯、(1,2,4-三氮唑)基二硫代甲酸苄酯和二硫代新戊酸苄酯等对SiO2表面接枝聚合苯乙烯速率的影响。结果表明，SiO2表面接枝聚合苯乙烯的速率决定于RAFT试剂的Z基团结构。二硫代新戊酸苄酯调控的SiO2表面接枝聚合苯乙烯的速率最高。

Abstract: Double bonds were immobilized onto nanoSiO2 via hydrolyzing alkoxysilane moiety of γ-methacryl trimethoxysilane for condensation with hydroxide groups from nanoSiO2. RAFT grafting polymerization of styrene from nanoSiO2 was carried out from the immobilized double bonds, in which azobisisobutyronitrile was used as initiator, 2-cyanoprop2-yldithiobenzoate, benzyl dithiobenzoate, benzyl dithiopivalate, 1,2,4-triazolyl-1-carbodithioic acid benzyl ester were used as RAFT agent, respectively. Results showed that RAFT grafting polymerization rate of styrene from SiO2 was decided by Z group of RAFT agent. Grafting polymerization of styrene from SiO2 mediated by benzyl dithiopivalate exhibited the highest grafting polymerization rate.