Hybrid TiO2-polysiloxane nanoparticles as well as hybrid TiO2-polysiloxane gels were prepared and characterized applying solvent-induced aggregation effects of titanium alkoxide-modified polysiloxane block copolymers. The functionalized polymers were prepared by the covalent attachment of coordination sites that allow the binding to metal alkoxides (M(OR)4; M = Ti; R = ethyl, butyl, isopropyl). Composition and structure of the hybrid polymers were investigated by NMR and FT-IR spectroscopy. In a second step the metal-alkoxide functionalities were hydrolyzed to form the respective metal oxides. Depending on the solvent in which the hydrolysis took place, hybrid nanoparticles or gels were obtained as a result of the different compatibility of the polysiloxane blocks towards the polarity of the solvents. The formed materials were investigated by NMR, FT-IR, atomic force microscopy (AFM), electron microscopy, and dynamic light scattering (DLS).
利用
钛醇盐改性聚
硅氧烷嵌段共聚物的溶剂诱导聚集效应,制备并表征了杂化 TiO2-聚
硅氧烷纳米粒子以及杂化 TiO2-聚
硅氧烷凝胶。功能化聚合物是通过配位位点的共价连接来制备的,配位位点允许与
金属醇盐(M(OR)4;M = Ti;R = 乙基、丁基、异丙基)结合。通过核磁共振和傅立叶变换红外光谱研究了杂化聚合物的组成和结构。在第二步中,
金属醇盐官能团
水解形成相应的金属氧化物。根据发生
水解的溶剂,由于聚
硅氧烷嵌段对溶剂极性的不同相容性,获得杂化纳米颗粒或凝胶。通过核磁共振、傅立叶变换红外光谱、原子力显微镜(A
FM)、电子显微镜和动态光散射(DLS)对形成的材料进行了研究。