UV light copolymerization of dimethyl vinylphosphonate with bisphenol A ethoxylate dimethacrylate

摘要

Dimethyl vinylphosphonate (DMVP), a very promising monomer, was copolymerized with acrylic monomer bisphenol A ethoxylate dimethacrylate (BEMA), in different molar ratios, by radical photoinitiated polymerization in the presence of photoinitiator Darocur 4265 (3 wt%) and in the absence of solvent. The UV light polymerization was an efficient method to obtain polymers in a green procedure. The molar ratio between DMVP and acrylic monomer BEMA varied between 1:1 and 5:1. The copolymers were characterized by FTIR, thermal analysis, water uptake and conductivity. From the ATR-FTIR spectra of DMVP-BEMA copolymers at the molar ratios of 1:1-5:1, it was observed that the intensity of P-O-C aliphatic band increased with increases in DMVP content. The synthesized copolymers showed good thermal stability in the range of 335-390 degrees C. DMVP: BEMA copolymer at 1: 1 molar ratio displayed the highest stability, with decomposition temperature above 390 degrees C, the highest temperature in the series. The water uptake decreased with increases in DMVP content and this behavior was correlated with the ionic conductivity. Based on the Bode diagrams, the ionic conductivity of DMVP: BEMA of 1:1 molar ratio was 6.15 x 10(-8) S cm(-1) and that of DMVP: BEMA of 2:1 molar ratio was 3.69 x 10(-8) S cm(-1) which were considered promising as valuable conducting materials.