The Preparation And Properties Of Polymer Film Based On Silica Nano-partiles

With the pursuit of beautiful building, a large amount of glass structure has been used in modern architecture. However, due to the poor insulation performance of the glass, it will consume more energy to keep the building cool in hot summer. In order to save energy, preparing heat-insulating properties of laminated glass membrane becomes an effective method to solve this urgent problem.In this thesis, we choose the economic and available polymer EVA (ethylene-vinyl acetate) as laminated glass intermediate film substrate to prepare laminated glass film. Nano-silica and hollow glass microspheres modified by silane coupling agent were used as modifier solution blending in EVA film to improve the insulation performance. The influence of different nano-particles content on properties such as film transmittance, heat resistance, tensile properties, peel strength, and thermal stability was observed. At the same time, SEM was used to observe the distribution of nano-particles in the film.To solve the compatibility problem between nano-particles and polymer matrix, we apply silica in-situ polymerization to our experiment. The SEM was used to observe inner structure of the film. The scanning electron micrograph indicates that this strategy can improve the compatibility. Then, the relationship between the content of gel and transmittance, heat resistance, tensile properties, peel strength, thermal stability of film was investigated.To further enhance the insulation of laminated glass film, we choose the self-made ordered mesoporous silica as modifier. Laser particle size analyzer, TEM and BET adsorption were applied to observe the mesopore structure of SiO2. The result indicates that the pore diameter of SiO2 is central on 3 nm. The effect of different amount of ordered mesoporous silica on film transmittance, heat resistance, tensile properties, peel strength, thermal stability was investigated. From the above experiment, we know that the modified film is an excellent thermal insulation laminated glass film material.