In-Situ Measurement of Volume Change Behavior of Cationic Polymerization Type Photopolymer

Abstract

Photopolymers have been used in many fields such as hologram recording material, adhesion, printing, dental material, and electronics. However, it has a problem that UV irradiation leads to volume shrinkage with undesirable influence on cured materials. In this study, shrinkage behavior of the cationic polymerization type monomers were evaluated by correlation existing between the chemical structure and reaction behavior of the monomers. As a result, it was clear that the epoxy, oxetane and vinyl ether monomers showed different volume shrinkage types of behavior. In particular, it was found out that alicyclic type epoxy monomer DEB had a unique volume change behavior. The unique volume change behavior of DEB occurred by molecular weight and steric hindrance of the produced polymers.