An Easy Way to Adjust the Properties of Epoxy in Cationic Photopolymerization
Yang Jinliang, Tronly New Electronic Materials Cooperation, 9:00 AM - 9:30 AM
Abstract: Compared with free radical photopolymerization, cationic photopolymerization has a great advantages, such as the practical monomers(epoxides, vinyl ethers and propenyl ethers), are less toxic and irritant than (meth)acrylates which are widely used in free radical photopolymerization. Among the epoxy monomers, oxetane is one kind of reactive heterocyclic compounds can be used in cationic ring-opening polymerization. Moreover, oxetanes can be synthesized by inexpensive, environmentally friendly starting materials and have low orders of acute and chronic toxicity and non-mutagenic. In previous studies, Crivello found out that 3,3-disubstituted oxetane monomers can be significantly increased the polymerization rate by combining with acrylate monomers into hybrid photopolymer systems. Until now, most of the investigations focused on copolymerization especially with cycloaliphatic di-epoxide and acrylate monomers into hybrid photopolymer. In our work, we used oxetane monomer(MOX104) to copolymerizing with different kinds of epoxy monomers in cationic photopolymerization to increase the conversion and the rate of photopolymerization of epoxy monomers, especially the diglycidylether of bisphenol A epoxy resin (DGEBA). In order to adjust the properties of the polymer, different initiator concentrations, co-monomers were applied. The result showed that the conversion of MOX104 was improved significantly by adding a certain amount of 3,4-epoxycyclohexane carboxylate or diglycidylether of bisphenol A epoxy resin. Moreover, the glass transition temperature, decomposition temperature and Young`s modulus of poly (MOX104) were improved by adding different amount of diglycidylether of bisphenol A epoxy resin.