水溶性和油溶性引发剂引发γ-甲基丙烯酰氧基丙基三甲氧基硅烷/苯乙烯细乳液共聚合的比较  

MINIEMULSION COPOLYMERIZATION OF γ-METHACRYLOXYPROPYLTRIMETHOXYSILANE AND STYRENE INITIATED BY OIL-SOLUBLE AND WATER-SOLUBLE INITIATORS

作　　者：曹志海[1] 单国荣[1] 

机构地区：[1]化学工程国家重点实验室(浙江大学)浙江大学化工系,杭州310027

出　　处：《高分子学报》2008年第10期941-946,共6页Acta Polymerica Sinica

基　　金：教育部新世纪优秀人才支持计划(项目号NCET-05-0512)资助项目

摘　　要：分别用水溶性的过硫酸钾(KPS)和油溶性的2,2′-偶氮二异丁腈(AIBN)为引发剂引发γ-甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)/苯乙烯(St)细乳液共聚合反应.比较了两类引发剂对MPS/St共聚合动力学(包括硅氧烷水解动力学和MPS/St的自由基共聚合动力学)、乳胶粒稳定性和共聚产物微结构的影响.Two types of initiators, water-soluble （potassium persulphate, KPS） and oil-soluble （2,2＇- azobisisobutylonitrile, AIBN ） initiators, were applied to initiate the copolymerization of γ-methacryloxypropyhrimethoxysilane （MPS） and styrene （St） in miniemulsion mode. The influences of the nature of initiators on the kinetics including the hydrolysis of methoxysilyl groups and free radical copolymefization, the stability of latex particles and the microstructure of copolymer were investigated. The overall conversion was measured by gravimetry; the methanol content and individual monomer conversion during the process of reaction were followed by gas chromatogram; the size of mini-droplets and latex particles were measured by DLS; the microstructure of copolymer was characterized by FTIR and 29Si solid state NMR, respectively. The interfaces of mini-droplets or latex particles were the main loci of hydrolysis reactions attested by the independence of hydrolysis rate of MPS on the nature of initiator which could determine the distribution of radicals between aqueous and oil phases. The hydrolysis rate increased with the increase of the MPS/St ratio because of the increase of the amount of MPS at the interface, but the final hydrolysis degree was independent on the MPS/St ratio for both systems initiated by AIBN and KPS as a result of the simultaneous increase of the amount of MPS at the interfaces and in the interior of droplets or latex particles. Compared to the system initiated by KPS, the higher final hydrolysis degree appeared in the system initiated by AIBN could be attributed to the lower reaction rate and longer reaction time. The kinetic behaviors of copolymerization of MPS and St and homopolymerization of St initiated by KPS showed in the completely different way, but in the similar way for the system initiated by the AIBN. This phenomenon could be ascribed to the different water solubility of monomers and the different origin of radicals of KPS and AIBN. The introduction of MPS accelerated t

关 键 词：引发剂 细乳液聚合 Γ-甲基丙烯酰氧基丙基三甲氧基硅烷 苯乙烯 

分 类 号：O631.5[理学—高分子化学]