Photopolymerization activity of perester derivatives of fluorenone and benzophenone: A real time FTIR and differential photocalorimetric study

摘要: Abstract The photopolymerization activities of three novel perester derivatives fluorenone and a mono tetra derivative benzophenone in methyl methacrylate (MMA) an ethoxylated bis-phenol-A diacrylate have been studied using combination gel permeation chromatography (GPC), photodifferential scanning calorimetry (PDSC) real time Fourier transform i.r. spectroscopy (RTFTIR). Using GPC analysis on the polyMMA samples, both mono- tetra-tert-butylperester are found to give higher weight -( M w ) number-average molecular ( n polymers than those produced initiators with giving highest values. Both values for obtained were 4-tert-butylperester-7-nitro followed by 2-tert-butylperester then 2,7-di-tert-butylperester derivative. Whilst former initiator has extinction coefficients near u.v. region, latter exhibits degree self termination. presence tertiary amine co-synergist (N-methyldethanolamine) is no significant influence or derivatives. PDSC, efficiencies be dependent upon their structure concentration. For some photoinitiators, maximum photoinitiation efficiency occurs at 0.25% w/w above which screening self-termination appear dominate bis-tert-butylperester being most efficient. two peresters benzophenone, increases increasing concentration self-termiantion observed up 0.75% PDSC concluded valuable comparative method reinforcing other methods characterization. results RTFTIR similar many respects effective initiator.