Preparation Of Gradient Materials Of Polysilane And Polyacrylate

To prepare the functionally gradient materials (FGM) of polysilane-polyacrylate, the method of solution preparation was performed. Based on the results of the back-scattered electron images and linear scanning of the polysilane-polyacrylate film's cross section, the dependence of polysilane-polyacrylate film's structure on molecules of polysilane and polyacrylate, PMMA/PMTS feed ratio and component concentration were investigated. Then properties of the polysilane-polyacrylate gradient films were characterized. The mechanism of film forming process of polysilane-polyacrylate FGM was probed into as well.Organosilicone monomer MTS with higher silicone content than raw monomer KH-570 was elaborated at a fairly low output rate. Afterwards, the solution polymerization of MTS, MMA, and copolymerization of MTS and MMA were carried out. Then, surface tension measurements on various solution of PMMA, PMTS, MTS- MMA copolymer indicated that the change of polysilane's surface tension was not significant when its concentration was lower than 30%, while that of polyacrylate's varied much more significant yet. IR, SEM-EDX, and water contact angle measurements on polysilane and polyacrylate film obtained by double operations and single operation showed that the influence of weight ratio of polymers, the molecular of PMMA on film structure was great. The film translucence dropping while the ratio of PMMA/PMTS grew and the compatible reducing while the molecular of PMMA increased. Besides, it was founded that the compatible of the system consisted of MTS-MMA copolymer and PMMA was better than that of PMTS/PMMA. The obtained polysilane-polyacrylate gradient films showed no macro-interface with the silicone content reducing gradually from the top surface to the bottom one.DMA thermograms indicated that polysilane-polyacrylate gradient films contained two glass temperatures with their bands drifting from and their range extending much from each component. The good properties of waterproof, calorifics, and ultraviolet-absorption were also determined by DSC, UV and water contact angle measurements.