细乳液聚合制备聚丙烯腈/纳米SiO_2复合粒子  

Preparation of Polyacrylonitrile/Nano-SiO_2 Composite Particles by Miniemulsion Polymerization

作　　者：赵雯婷[1] 谢建武[2] 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,杭州310027 [2]杭州职业技术学院化工系,杭州310018

出　　处：《化学反应工程与工艺》2009年第1期64-68,共5页Chemical Reaction Engineering and Technology

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-07-0738)

摘　　要：由含甲基丙烯酸-3-三甲氧基硅烷(MPS)改性纳米SiO_2的丙烯腈细乳液聚合制备聚丙烯腈/纳米SiO_2复合粒子。研究了纳米SiO_2的改性及含量、十二烷基硫酸钠(SDS)乳化剂和十六烷(HD)助乳化剂浓度对细乳化液滴粒径的影响。结果表明,直接采用未改性纳米SiO_2,细乳化后出现双峰分布,纳米SiO_2粒子未有效进入单体液滴;用10%MPS改性纳米SiO_2后,细乳化液滴呈单峰分布。随着纳米SiO_2粒子含量的增加,细乳化液滴的平均粒径增大,分布变宽。含纳米SiO_2粒子的细乳化液滴体的平均粒径随SDS浓度和HD浓度增大而减小。透射电镜观察发现,细乳液聚合产物的连续相中无纳米SiO_2粒子分布,复合粒子呈非规整结构,纳米SiO_2粒子在聚丙烯腈基体中基本呈初级粒子分布。The miniemulsion polymerization method was applied to prepare polyacrylonitrile/ nano-SiO2 composite particles by using acrylonitrile （AN） and aqueous dispersion of nano-SiO2. The influences of coupling treatment of nano-SiO2, the content of nano-SiO2, the concentrations of sodium dodecylsulfate （SDS） and hexadecane （HD） on the size distribution of subdroplets were investigated. It was found that the size distribution of submicrodrops showed two peaks when the unmodified nano-SiO2 was used, indicating that nano-SiO2 could not enter the submierodrops effectively. When 10 % 3-（trimethoxysilyl）propyl methacrylate （MPS） was used to treat nano-SiO2, the size distribution of submicrodrops showed a single peak distribution. The average size of submicrodrops increased and the size distribution broadened as the content of SiO2 in AN increased. The average size of AN submicrodrops decreased as the content of SDS and HD increased. The transmission electron microscopy results showed that nano-SiO2 particles were encapsulated in PAN and the obtained PAN/nano-SiO2 composite particles exhibited the crumpled spherical morphology. Most SiO2 particles was dispersed in PAN matrix in the primary particle form.

关 键 词：聚丙烯腈 纳米二氧化硅 细乳液聚合 复合粒子 

分 类 号：TB324[一般工业技术—材料科学与工程]