The influence of temperature and photoinitiator concentration on photoinitiated polymerization of diacrylate monomer

Abstract

The behavior of p-methoxybenzoyldiphenylphosphine oxide, previously synthesized, as a photoinitiator for the polymerization of diacrylate monomer, in the presence of 3% (w/w) tertiary amine (triethyl amine) as synergist additive, was studied. The influence of temperature in the range 30-90 °C at 3% (w/w) photoinitiator concentration and the influence of the photoinitiator concentration in the range 0.5-3.5% (w/w) at 30 °C was investigated by differential scanning photocalorimetry (photo-DSC). In all experiments the photopolymerization was performed at constant light intensity (3 mW cm-2). The maximum conversion was obtained at temperature of 90 °C at 3% (w/w) photoinitiator concentration and 3% (w/w) triethyl amine. The optimal concentration of photoinitiator to obtain maximum conversion was 3% (w/w), at 30 °C. No thermal polymerization occurred at higher temperature. © Central European Science Journals. All rights reserved.