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概述了光引发体系、光照强度、单体平均官能度、液晶含量、反应温度、助剂等对乙烯基单体/液晶混合物光聚合动力学及光固化流变行为的影响.在染料和胺组成的二元Ⅱ型(夺氢型)光引发体系中,引入适当的第三组分能显著提高反应速率和转化率;增加光照强度和升高温度也能显著提高反应速率和转化率.随着单体平均官能度的增加,体系的反应速率和转化率呈现先增加后降低的趋势.对于Ⅰ型(裂解型)光引发剂,液晶含量增加,单体反应速率降低,但转化率基本不变;但对于Ⅱ型光引发剂,液晶含量增加能大幅提高单体反应速率和转化率.加入使体系黏度降低的助剂也能提高体系的反应速率和转化率.在体系相同、温度固定的条件下,反应速率越高,凝胶化时间越短;相同体系,温度升高,凝胶化时间提前;相同温度下,单体官能度愈高,体系凝胶时间亦愈短.
The effects of photoinitiator system, light intensity, monomer average functionality, liquid crystal content, reaction temperature and additives on the photopolymerization kinetics and photocuring rheology of vinyl monomer / liquid crystal mixtures were summarized. Of the second type (hydrogen abstraction type) photoinitiation system, the introduction of the appropriate third component can significantly improve the reaction rate and conversion rate; increase the light intensity and increase the temperature can also significantly improve the reaction rate and conversion rate.With the The average reaction rate and the conversion rate of the system tend to increase at first and then decrease with the increase of the average functional degree of the monomer.For Type Ⅰ (pyrolysis) photoinitiator, the content of liquid crystal increases and the monomer reaction rate decreases, but the conversion rate remains basically unchanged ; But for type II photoinitiator, the increase of liquid crystal content can greatly improve the monomer reaction rate and conversion rate.Adding the additives that make the viscosity of the system can also improve the reaction rate and conversion rate of the system.In the same system, the temperature is fixed conditions , The higher the reaction rate, the shorter the gelation time; the same system, the temperature increases, the gelation time ahead; the same temperature, the higher the monomer functionality, the system gel time is shorter.