2,2′-二邻甲氧基苯基-4,4′,5,5′-四苯基-1,2′-二咪唑复合光引发体系的光聚合动力学研究

Photopolymerization Kinetics of 2,2′-diomethoxyphenyl-4,4′,5,5′-tetraphenyl-1,2′-diphenylimidazole Photoinitiator System

本文研究了对2,2′-二邻甲氧基苯基-4,4′,5,5′-四苯基-1,2′-二咪唑(BMOIM)复合光引发体系引发聚合动力学过程.采用紫外光谱仪对引发剂、供氢体、增感剂在紫外区的吸收谱图进行了表征.利用实时红外光谱仪对复合光引发体系引发聚合动力学过程进行实时监测,考察了不同光强、引发剂浓度以及不同官能度单体对反应速率及最终双键转化率的影响.结果表明,在引发剂浓度为0.6%(质量分数)时,20s内双键转换率达到96%,随着引发剂浓度的提高,聚合速率增大.聚合速率以及最终双键转化率随着光强增大而增大;双官能团单体的最终双键转化率比三官能团单体的最终双键转化率要高.

The photopolymerization kinetics of 2,2′-diomethoxyphenyl-4,4′,5,5′-tetraphenyl-1,2′-diphenylimidazole（BMOIM） was investigated in this study.The UV absorption spectra of photoinitiator,hydrogendonor and photosensitizer were analysized by UV spectrometer.Real time infrared spectroscopy（RT-IR） was used to investigate the influence of different light intensity,different functionality monomer system and photoinitiator concentration on polymerization kinetics.The results showed that the double bond conversion could reach to 96% in 20 s,when the concentration of photoinitiator was 0.6%.The rate of polymerization increased with increase of the initiator concentration.The final double bond conversion and polymerization rate increased with increase of light intensity.The final double bond conversion of bifunctional monomer was higher than that of trifunctional monomer.