KCD/MDEA/TA三元引发剂引发丙烯酸酯/液晶复合体系光聚合动力学

采用配有441.6 nm滤光片的光差示扫描量热仪研究了3,3'-羰基双(7-二乙胺香豆素)(KCD)/N-甲基二乙醇胺(MDEA)/2-(4-甲氧苯基)-4,6-双(三氯甲基)-1,3,5-三嗪(TA)三元引发剂引发丙烯酸酯/液晶复合体系光聚合动力学行为. 结果表明, 在KCD/MDEA复合引发剂中添加TA, 显著提高了丙烯酸酯/液晶复合体系的最大光聚合速率[R_p(max)]和单体转化率, 当TA质量分数为0.5%时, 体系的R_p(max)和单体转化率分别提高了100%和69%. 同时, 随着光照强度的增加, 该体系的R_p(max)和单体转化率呈增大的趋势, 当光强从1.5 mW/cm⁺²提高到35.2 mW/cm⁺²时, 其R_p(max)和最终单体转化率分别提高了2.5和2.8倍.

Photopolymerization Kinetics of Acrylate/Liquid Crystal Mixtures Initiated by Ketocoumarin/Amine/Triazine Ternary Photoinitiator

The photopolymerization kinetics of acrylate/liquid crystal(LC) mixtures photoinitiated by 3,3′-carbonyl bis(7-diethylaminocoumarin)(KCD)/N-methyl-N,N-diethanolamine(MDEA)/2-(4-methoxy-phe-nyl)-4,6-bis(trichloromethyl)-1,3,5-triazine(TA) was studied by photo-differential scanning calorimetry equipped with 441.6 nm filters.The results indicate that adding TA into KCD/MDEA binary photoinitiator greatly increases the maximum rate of photopolymerization Rp(max) and monomer conversion.Rp(max) and the total monomer conversion increase respectively by 100% and 69% as the content of TA is 0.5%(mass fraction).Moreover,both Rp(max) and total monomer conversion increase by 2.5 and 2.8 times separately when the light intensity rises from 1.5 mW/cm2 to 35.2 mW/cm2.