原位乳液聚合制备丙烯腈聚合物/纳米氧化硅复合粒子  

Preparation of Acrylonitrile Polymer/Nanometer Silica Composite Particles by In-Situ Emulsion Polymerization

作　　者：赵雯婷[1] 包永忠[1] 黄志明[1] 

机构地区：[1]浙江大学化学工程联合国家重点实验室,浙江杭州310027

出　　处：《化学反应工程与工艺》2009年第6期545-549,共5页Chemical Reaction Engineering and Technology

基　　金：教育部新世纪优秀人才支持计划(NCET-07-0738)

摘　　要：利用2,2′-偶氮(2-脒基丙烷)二氯化氢(AIBA)引发剂与纳米氧化硅粒子的静电作用而使AIBA吸附在纳米氧化硅表面,进而引发丙烯腈-甲基丙烯酸甲酯(AN-MMA)原位乳液聚合。考察了AIBA浓度和反应温度对AN-MMA原位乳液聚合动力学的影响以及氧化硅含量对AN-MMA共聚物/纳米氧化硅复合乳胶粒径分布和形态的影响。结果表明:聚合速率随AIBA浓度和聚合温度的升高而增大;AIBA浓度相同时,原位乳液聚合速率小于普通乳液聚合;AN-MMA共聚物/纳米氧化硅复合粒子粒径随纳米氧化硅含量增加而增大;原位乳液聚合得到的复合胶粒表面粗糙,当纳米氧化硅质量分数为10%时,纳米氧化硅与聚合物乳胶粒子复合良好;当纳米氧化硅质量分数为20%和30%时,有部分纳米氧化硅粒子与乳胶粒子分离而分散在连续相中。Acrylonitrile-methyl methacrylate(AN-MMA) copolymer/nanometer silica composite particles were synthesized by in-situ emulsion polymerization in the presence of nanometer silica absorbed with 2,2′-azobis(2-amidinopropane)dinydrochloride(AIBA).The effects of AIBA concentration and reaction temperature on the kinetics of in-situ emulsion polymerization of AN-MMA,and the effects of content of SiO2 on the particle size distribution and morphology of composite particles were investigated.It was found that the conversion of AN and MMA increased with the increase of AIBA concentration and temperature,and the polymerization rate of in-situ emulsion was lower than that of the conventional emulsion polymerization at the same AIBA concentration.The average size of AN-MMA copolymer/silica composite particles increased with the incease of the content of silica in monomers.The AN-MMA copolymer/silica composite particles exhibited rough surfaces,and nanometer silica particles were combined well with latex particles when mass fraction of silica was 10%,and a part of silica particles were separated from the latex particles and located at the water phase when mass fraction of silica was 20% and 30%,respectively.

关 键 词：纳米氧化硅 2 2′-偶氮(2-脒基丙烷)二氯化氢 丙烯腈 静电吸附 原位乳液聚合 

分 类 号：TQ316.334[化学工程—高聚物工业]