软模板法制备单分散中空有机硅微球

通过硅氧烷单体在碱性条件下的水解-聚合反应,制备出了单分散乳液,研究了乳化剂HLB、反应时间、乳化剂用量、单体用量等因素对乳液的影响。然后以该乳液为模板、有机硅为壳层进行包覆,得到了中空微球。采用纳米粒度及Zeta电位分析仪、SEM、TEM、EDS、FTIR对乳液及中空微球进行表征。结果表明,在室温条件下,反应时间为6h时能够制备出单分散性较好的乳液,通过改变乳化剂用量、单体用量,能够实现对乳液粒径的调控,调控范围346～472 nm。以该乳液为模板进行缓慢包覆,当乳化剂质量分数低于0.003%时,能够得到形貌规整的单分散中空微球,中空微球的主要成分为有机硅。与硬模板法相比,该模板通过乙醇洗涤即可除去,制备过程较为简单。

Preparation of Monodisperse Hollow Organic Silicone Microspheres by Soft Templating Method

Abstract: Emulsions with high monodispersity were prepared through a hydrolysis-polymerization process. The influence of process parameters like emulsifier HLB, reaction time, emulsifier content and monomer content were studied. Then, the emulsion was coated as a template and organic silicone was used as a shell layer to obtain hollow microspheres. The emulsions and microspheres were characterized by Zetasizer Nano ZS90, SEM, TEM, EDS and FTIR. The results showed that highly monodispersed emulsions could be prepared at room temperature for 6 h. By changing the amount of emulsifier and original monomer, the particle size of the emulsion could be turned from 346 nm to 472 nm. Then, monodisperse hollow mi-crospheres with regular morphology could be obtained when the mass fraction of the emulsifier was less than 0.003% by using the emulsion as a template, and the main component of hollow microspheres was organic silicone. By comparing with hard templating method, the preparation process was relatively simple and the template could be removed by washing with ethanol.