微滴乳液聚合制备PDMS/SiO_2纳米复合材料  

Preparation of PDMS/SiO_2 nanocomposites via miniemulsion polymerization

作　　者：杨磊[1] 许湧深[1] 邱守季[1] 张娅[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《化工学报》2013年第4期1473-1477,共5页CIESC Journal

摘　　要：采用超声分散的方法,以少量八甲基环四硅氧烷(D4)对硅溶胶粒子进行表面接枝改性。然后在改性硅溶胶存在下,以十二烷基苯磺酸(DBSA)为乳化剂兼催化剂进行D4的微滴乳液聚合,得到聚硅氧烷(PDMS)/二氧化硅(SiO2)纳米复合乳液。采用FTIR、TGA、纳米粒度仪、TEM和拉力机分别对样品进行了表征。结果表明:采用超声分散的方法,能够有效地实现硅溶胶粒子的表面改性。通过微滴乳液聚合得到的复合乳胶粒是聚合物包覆二氧化硅粒子的核壳结构形态。SiO2的引入提高了有机硅复合膜力学性能,增强了热稳定性。Ultrasonic dispersion process was utilized to modify silica sol nanoparticles with a small amount of D4.Then in the presence of modified silica sol,miniemulsion polymerization of D4 was conducted with DBSA as emulsifier and catalyst,and polydimethylsiloxane（PDMS）/SiO2 nanocomposites emulsion latex was obtained.Modified silica sol particles were characterized by FTIR and TGA.The diameter and morphology of the composite latex particles were analyzed by nano particle size analyzer and TEM,respectively.Mechanical properties and thermal stability of the composite films were characterized by tensile test and TGA.The results showed that ultrasonic dispersion was an effective way to modify silica sol particles.Modified silica sol particles could be encapsulated by polydimethylsiloxane and form core-shell latex particle morphology during miniemulsion polymerization.Introduction of SiO2 improved mechanical properties and thermal stabilities of polysiloxane composite films.

关 键 词：硅溶胶 聚硅氧烷 超声分散 微滴乳液聚合 纳米复合材料 

分 类 号：O635[理学—高分子化学]