新型紫外光引发气/固聚合反应体系

A new vapor/solid polymerization system initiated by UV light

A new apparatus for carrying out vapor/solid polymerization initiated by UV light has been designed. The system relies on monomer photolysis and the benzophenone/triethanolamine system to initiate polymerization of vinyl acetate to afford poly (vinyl acetate) on the surface of biaxially oriented polypropylene (BOPP) film and glass respectively. The poly (vinyl acetate) formed on the surface of the BOPP film was shown to be partly crosslinked (up to 46%), while that formed on the surface of the glass could all pass through a 200 mesh metal filter. The values of the polydispersity index (PDI) of the polymers were 6.0 and 4.0 respectively. In the case of both BOPP and glass substrates, the mass/thickness of the polymer and its molecular weight increased with reaction time. Increasing the temperature gave an increase in the molecular weight of the polymer formed on the BOPP film but not of that on glass. Mechanisms for the formation of polymer on BOPP film and glass substrates are proposed. Furthermore, after modification of the reaction apparatus, the degree of crosslinking of the polymer formed on the BOPP film was higher than 95% and while the mass of polymer formed on the surface of glass eased significantly, it could still all pass through the 200 mesh metal filter.