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采用光-流变学方法研究了丙烯酸酯/液晶复合体系的光聚合凝胶时间及体积收缩率,并与密度法测量的体积收缩率进行了对比.结果表明,该复合体系的凝胶时间小于10 s,光-流变学方法可以在线测量丙烯酸酯单体/液晶复合体系的光聚合体积收缩.以2种不同结构的多面体齐聚倍半硅氧烷(POSS)掺杂丙烯酸酯/液晶复合体系,八甲基丙烯酰氧基倍半硅氧烷(MA-POSS)使丙烯酸酯/液晶复合体系的双键转化率略有降低,掺杂10 wt%MA-POSS使体系的光聚合体积收缩率仅降低了12%;而甲基丙烯酰氧基七异丁基倍半硅氧烷(MI-POSS)对体系双键转化率的影响较小,显著降低了体系的光聚合体积收缩,掺杂10 wt%MI-POSS使体系的光聚合体积收缩率降低29%.
The photo-rheological method was used to study the photopolymerization gel time and volume shrinkage ratio of acrylate / liquid crystal composite system, and compared with the volumetric shrinkage ratio measured by density method.The results showed that the gel time of the composite was less than 10 s, photo-rheology method can be used to measure the photopolymerization volume shrinkage of acrylate monomer / liquid crystal composite system.A two-structure polyhedral oligomeric silsesquioxane (POSS) doped acrylate / liquid crystal composite System, octamethacryloxysilsesquioxane (MA-POSS) slightly reduced the double bond conversion rate of the acrylate / liquid crystal composite system. When 10 wt% MA-POSS was doped, the photopolymerization volume of the system was reduced Only 12% lower; however, MI-POSS had little effect on the double bond conversion rate of the system, significantly reducing the volume shrinkage of the photopolymerization system, Miscellaneous 10 wt% MI-POSS reduced the photopolymerization volume shrinkage of the system by 29%.