Study On Functional Materials Prepared By Surface-Initiated Immortal Polymerization

SiO2 has many advantages, such as chemically inert, thermal stability and easily silylated derivatives. It is widely used in the field of biology, electronics, optical engineering and etc. However, the poor solubility and low dispersion in solvents limit its application. Using CO2 as carbon source to synthesize the degradable polycarbonates is an environmentally friendly polymerization process. However, the low mechanical properties of CO2-based polycarbonates significantly restrict their wide application. In this thesis, "surface initiated immortal polymerization" was used to the grafting of CO2/epoxide alternating copolymer on SiO2 surface from the active group (-OH) on SiO2. The resultant polycarbonate/silica nanometer materials improve not only the solubility of silica in organic solvents and dispersion, but also the heat resistance and mechanical properties of polycarbonates. The present study provides a feasible method for the modification of silica gel, and thus benefitting the application of CO2-based polycarbonates.Surface resistance to nonspecific protein adsorption, cell /bacterial adhesion, and biofilm formation is critical for the development and performance of biomedical and analytical devices. Due to its electrical conductivity, oxidation resistance and easy surface modification, gold is widely used as matrix nano-modification for the preparation of biological microelectronic devices, which was widely used in biomedical and biological analysis equipment. Nevertheless, due to the surface in a biological environment is easy to absorb protein and cells, significantly influencing the instrument sensitivity. Therefore, the modification of gold surface for enhancing the anti-nonspecific adsorption of proteins is very necessary. In this thesis, a epoxy alkane monomer with a polyethylene glycol (PEG) chain was synthesized, and further applied to the synthesis of polycarbonate brush with side PEG chains via the "surface initiated immortal polymerization", in which the polymerization was initiated by gold surface hydroxyl (-OH). It was found that the gold grafted with polymer brushes had good anti-nonspecific adsorption of proteins. The polymer brush synthesized by "surface initiated immortal polymerization" is biodegradable. This study provides an environmental friendly method for surface antifouling areas.