Research On Surface Treatment And Thermal Decomposition Of Polyvinyl Fluoride Film

Polyvinyl fluoride is one of the material with fluorine, which has the minimum amount of fluorine, the lowest density. PVF film products have many excellent features.such as, corrosion resistance, abrasion-resistant, dielectric properties lubrication and durable, ultraviolet radiation resistant and permanent, widely used in aircraft anticorrosive material, solar battery panel and so on. The temperature of fusion was close to decomposition, and it is difficult to agglutination with other material. So it is necessary for us to study on the thermal decomposition and surface viscosity characteristic of PVF film.In this paper, we used chemical oxidation to deal with the PVF film, and through SEM, XPS, FTIR, contact angle measurement to characterizing the treatment effect. On the basis of which, the optimum conditions were determined. The thermal behavior of polyvinyl fluoride was investigated by TG and DTG in nitrogen atmosphere at different heating rates, analyzed the effects of heating rates on PVF thermal decomposition. The dynamic data were analyzed using Kissinger method and Ozawa method. The reaction order was obtained with Coats-Redfern method. Quantitative described the thermal stability and forecast the lifetime of the PVF film.The result showed that the surface contact angle of PVF film was reduced after chromic oxidation, increase the temperature can be beneficial to reduce the processing time; With the increase of etching time, the surface roughness was increased obviously, the surface oxygen content increased, and introduced some oxygen-containing groups such as hydroxyl group, carbonyl group and so on. The adhesion of PVF is obviously improved. The activation energy E was analyzed using Kissinger method is 231.36kJ·mol-1. Use Ozawa method calculated E was 225.97kJ·mol-1, and the activation energy increased with the increase in mass loss. The thermal degradation was found to be first order reaction with Coats-Redfern method. The lifetime estimate indicated the 10 year lifetime temperature maximum in nitrogen to be 123℃, which was made the 5% weight loss as the life terminated index.