细乳液法制备聚硅氧烷-Ag纳米复合微球及其抗菌性

Polysiloxane-Ag Nanocomposite Sphere Fabricated via Mini-emulsion Polymerization and Its Antibacterial Property

摘要: 首先以苯乙烯(St)及3-甲基丙烯酰氧基三甲氧基硅烷(MPS)为反应单体,通过细乳液聚合制备表面功能化聚硅氧烷微球,然后利用该微球表面的硅羟基及硅氧烷基团对Ag⁺的吸附及还原作用原位制备聚硅氧烷-Ag纳米复合微球。采用透射电镜(TEM)、紫外(UV-Vis)、热重分析(TG)及X射线衍射(XRD)等对聚硅氧烷-Ag纳米复合微球的形貌和组成进行了表征。研究表明:改变MPS和硝酸银的用量可调控聚硅氧烷-Ag纳米复合微球的形貌及表面银含量; 抗菌实验结果表明,聚硅氧烷-Ag纳米复合微球具有较好的抑菌性。

Abstract: Surface functionalized polysiloxane microspheres were synthesized by mini-emulsion polymerization with β-methacryloxy propyltrimethoxy silane(MPS) and styrene(St).Polysiloxane-Ag nanocomposite spheres were prepared by in-situ adsorption and reduction of Ag⁺ with the silanol and siloxane groups on the surface of polysiloxane microspheres.The morphology and component of polysiloxane-Ag nanocomposite spheres were characterized by TEM、UV-Vis、TG and XRD.Results showed that the morphology and the content of Ag on polysiloxane-Ag nanocomposite spheres could be tuned by the amount of MPS and silver nitrate.Furthermore,the polysiloxane-Ag nanocomposite spheres exhibited good antibacterial property.