STUDY OF THE UV- INITIATED CATIONIC POLYMERIZATION OF SOME SYSTEMS BASED ON THE EPOXY RESIN MODIFIED BY COCONUT OIL

Abstract

The UV – initiated cationic polymerization (UVICP)of the system based on the epoxy resin modified by coconut oil (ECNO) and the cationic photoinitiator, a triarylsulfonium salt (TAS), with the weight ratio of ECNO/TAS = 100/5 and systems based on ECNO, a biscycloaliphatic diepoxyde monome (BCDE), TAS withthe weight ratio of ECNO/BCDE =

20/80, the TAS contents ranged from 3-7% of total amount of the ECNO and BCDE, has been investigated. It was observed that the UVICP almostnot occurred in the system ECNO/TAS = 100/5, but was performed easily in the systems having the weight ratio of ECNO/BCDE = 20/80 and different contents of TAS. The highest conversion of epoxy groups in the system of

ECNO/BCDE/TAS = 20/80/5 among the investigated systems, more consumption of TAS, faster conversion of epoxy groups and higher content of ether groups formed in the system during UV – exposure in comparision with the sytem BCDE/TAS = 100/5 were determined. The obtained results were explaned by the ecran effect  of the TAS and plastisizing effect of the oils chains of the ECNO in the photoplymerization systems.