对烯丙氧基苯甲酸胆固醇酯对聚合物分散液晶薄膜电—光性能的影响

Effect of p-allyloxycholesterolbenzoate on the electro-optical properties of polymer dispersed liquid crystal films

摘要: 选用对烯丙氧基苯甲酸胆固醇酯(ACB)/甲基丙烯酸β-羟乙酯(HEMA)/液晶(LC)/光引发剂(IRG-651)/玻璃微珠(SP-220)复合体系,在紫外光照射下制备了聚合物分散液晶(PDLC)薄膜.结果表明:虽然ACB没有参与聚合,但却明显地提高了PDLC薄膜的对比度.在紫外光(365.0 nm)辐照度为15.0 mW·cm^-2、照射温度为303.2 K、照射时间为10.0 min的条件下,ACB/HEMA/LC/IRG-651/SP-220的比例(质量分数)为6.2%/18.5%/74.0%/0.3%/1.0%时,所制备的PDLC薄膜具有高对比度和较佳的电-光性能.

Abstract: Polymer dispersed liquid crystal (PDLC) films were prepared from photo-polymerization of a p-allyloxycholesterolbenzoate (ACB)/2-hydroxyethyl methacrylate (HEMA)/liquid crystal (LC)/photoinitiator (IRG-651)/glass spacer (SP-220) mixture by ultraviolet (UV) irradiation. It was found that the contrast ratio of PDLC films was remarkable increased with the addition of ACB although ACB did not participate in polymerization. Under the condition that the UV irradiance (365.0 nm) was 15.0 mW· cm_-2, the curing temperature was 303.2 K, and the UV irradiation time was 10.0 min. When the mass fractions of ACB/HEMA/LC/IRG-651/SP-220 were 6.2%/18.5%/74.0%/0.3%/1.0%, the PDLC films with high contrast ratio and better electro-optical properties were obtained.