一种反型PNLC电光特性曲线的研究

采用紫外光聚合分离法使混合体系(可光聚合单体/液晶/光引发剂)产生相分离,制备了以双官能团丙烯酸酯为基体的反型聚合物网络液晶膜材料。采用液晶光电测试仪测试了光引发剂1-羟基环己基苯甲酮(IRG184)浓度和不同种类液晶盒如平行盒和反平行盒对反型PNLC液晶膜的电光性能的影响。研究结果表明,当光引发剂IRG184浓度为0.2%时,采用双官能团丙烯单体材料作为可光聚合单体,选择光学各向异性和介电各向异性适当的向列相液晶D5,混合搅拌均匀以后灌注于盒厚7μm的反平行排列液晶盒中,在光强为18mW/cm2、波长主要为365nm的紫外光下,温度控制在25~30℃使其聚合,所得反型PNLC膜的电光特性曲线最佳,如阈值电压、工作电压等特性最好,并对研究结果进行了相关的讨论。

E-O properties of reverse-polymer network liquid crystal film

The UV polymerization-induced phase separation (PIPS) method was introduced to prepare the reverse-polymer network liquid crystal (PNLC) films with difunctional acrylate as main structure from the system contained photo-curable monomers, liquid crystal (LC) and photo initiator.The concentration of the photo-initiator 1-hydroxy Cyclohexane benzophenone (IRG184) was changed and the type of liquid crystal cells and their effects on the electro-optical properties of the reverse-polymer network liquid crystal (PNLC) were tested by LCT-5016.The results showed that the electro-optic curve (in terms of the properties such as threshold voltage and operating voltage) of the reverse-PNLC film was the best, when the condition was optimized as follow: the intensity of UV light was 18 mW/cm², the main wavelength was 365 nm, the temperature was between 25~30 ℃, the concentration of the photo-initiator IRG184 was 0.2%, the propylene monomer with double function groups was chosen as the photo-curable monomers, and the mixture was filled in the reverse parallel arrangement cell with 7 μm thickness.