PHOTOINITIATED CATIONIC COPOLYMERIZATION OF AN ALICYCLIC EPOXY COMPOUND AND A SPIROORTHOCARBONATE

This article describes the photoinitiated cationic copolymerization of 1,6,8,13-tetraoxaspiro [7,7] tridecanes (SOC7), unconstrictive monomer, and 3,4-epoxycyclohexylmethyl 3,4-epoxycyc-lohexane carboxylate (ERL-4221). The test results show that the addtion of a small amount of SOC7 to ERL-4221 system results in suppressing shrinkage without significantly degrading the thermal properties. The proper mol ratio of ERL-4221 to SOC7 is 4:1. A crosslinked copoly-mer having Tg 230℃ and volume shrinkage below 4.4% on photocopolymerization is obtained. The elemental analysis, FT-IR and 1H-NMR spectra were shown respectively for characterization of the photocopolymer.