Preparation of PDMS/SiO2 nanocomposites via miniemulsion polymerization

doi:10.3969/j.issn.0438-1157.2013.04.048

Abstract

Abstract: 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.

Key words: silica sol, polysiloxane, ultrasonic dispersion, miniemulsion polymerization, nanocomposites

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。

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

CLC Number:

O635

YANG Lei, XU Yongshen, QIU Shouji, ZHANG Ya. Preparation of PDMS/SiO₂ nanocomposites via miniemulsion polymerization[J]. CIESC Journal, 2013, 64(4): 1473-1477.

杨磊, 许湧深, 邱守季, 张娅. 微滴乳液聚合制备PDMS/SiO₂纳米复合材料[J]. 化工学报, 2013, 64(4): 1473-1477.

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Preparation of PDMS/SiO₂ nanocomposites via miniemulsion polymerization

微滴乳液聚合制备PDMS/SiO₂纳米复合材料

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