Preparation and characterization of surface grafting polymer of ZrO_2 membrane and ZrO_2 powder

摘要

Asymmetric alumina support zirconia (ASZ) supported poly (vinyl acetate) (PVAc) membranes were prepared. Vinyltrimethoxysilane (VTMS) was selected as a silane coupling agent Polymer layer was successfully prepared on VTMS silylated ASZ membrane by vinyl acetate free radical graft polymerization. The physicochemical characteristic of ZrO2 powders and ASZ membranes were evaluated by various analytical methods: XRD, SEM-EDS, BET, FTIR, TGA, AFM, and contact angle. The surface free energy (SFE) values of the modified membranes were determined by the Owens-Wend method, the contact angle measurements of glycerol and water were also carried out Surface roughness increase as graft percentage of free radical graft polymerization increase. However, the water contact angle results show that surface wettability has no definite dependence on surface roughness (AFM). The process of surface grafting was characterized by FTIR and TGA analytical techniques. The results have proved that the VTMS and PVAc chains were successfully grafted onto the ZrO2 surface. The main parameters affecting grafting percentage, namely reaction temperature, reaction time, and monomer concentrations, were investigated experimentally.