微波辐照辅助核/壳型聚硅氧烷/聚丙烯酸酯复合乳液的制备与表征

Preparation and Characterization of Polysiloxane/Polyacrylate Based Emulsion Under Microwave Irradiation

微波辐照乳液聚合技术具有产率高、节能省时等优点。本工作利用微波辐照,采用半连续种子乳液聚合法制备了具有明显核壳结构的聚硅氧烷/聚丙烯酸酯复合乳液;利用傅里叶变换红外光谱、粒度分析、核磁分析、透射电镜、热重分析等技术手段对产物进行了系统化表征,研究了偶联剂(γ-甲基丙烯酰氧基丙基三异丙氧基硅氧烷,C-1757)的用量对乳液聚合和复合胶膜性能的影响。结果表明:复合乳胶粒的平均粒径均小于100 nm,具有明显的核/壳结构;随着偶联剂用量的增加,复合乳胶粒粒径增大,分布变窄,制备的复合胶膜吸水率明显降低,力学性能和热稳定性显著提高。

Emulsion polymerization assisted by microwave irradiation(MI)owns many advantages such as high yield and energy/time saving.By using MI technique,polysiloxane/polyacrylate based emulsoid particles with evident core-shell structure was prepared via semi-continuous seeded emulsion polymerization.A silane coupling agent of 3-methylacryl oxypropyltriisopropoxysilane(C-1757)was employed to affect structure and properties of the emulsoid particles.Related physiochemical techniques including transmission electron microscopy,size distribution analyzer and thermogravimetric analysis were used to characterize the morphology and size distribution of the emulsoid particles,and the thermal stability of the resultant emulsoid film.It was concluded that,the emulsoid particles are made of polysiloxane cores coated by polyacrylate shells,their average size is smaller than 100 nm;with increasing the amount of coupling agent,the mean size of the emulsoid particles increases,and its distribution narrows;the water uptake of the prepared emulsoid film decreases,while its mechanical and thermal stability properties get potently improved.