The Effect Of Electric Field On Photopolymerization

Photopolymerization system can be mainly divided into free radicalpolymerization and cationic photopolymerization. As thephotopolymerization technology more and more widely used, the studieson photopolymerization are more and more intensive. Butthere are few reports about the effects of electric field onphotopolymerization. This paper introduce DC electric field in thephotopolymerization system, and preliminary study the effects of electricfield on photopolymerization. The details and conclusions are describedas follows:1、 The effect of electric field on free radical photopolymerization ofpolar or non-polar monomers was studied. SEM fracture morphologyand HRTEM results show that certain orientation was found in the polarmonomers system, and more obvious orientation was observed due to thehigher electric field and prolonged electric field action time. However, no orientation was found in the non-polar monomer system. Using RT-FTIRto analyze the kinetics of free radical photopolymerization under electricfield, we find out that electric field has almost no influence on thekinetics of free radical photopolymerization.2、 The effect of electric field on cationic photopolymerization systemwas studied, we find out that electric field can induce polymerization ofethylene glycol monovinyl ether by using onium salts cationicphotoinitiator as initiator without UV. RT-FTIR results displayed thatelectric field induced polymerization has almost the same polymerizationrate and monomer conversion as compared to UV induced polymerization.Through the study of different electric field intensity, different contents ofphotoinitiator and different monomers, we find out that to achieve acertain polymerization rate and monomer conversion, the monomersmust have certain polarity;0.5%initiator is enough to gain a highpolymerization rate and monomer conversion; Polymerization ratedecreases as the decreased of electric field intensity,and the monomerconversion dropped dramatically when the electric field intensitydecreased to a certain value, and there were almost no reaction when theelectric field intensity dropped to1.5v/0.3mm.