對烯丙氧基苯甲酸膽固醇酯對聚合物分散液晶薄膜電—光性能的影響

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

摘要: 選用對烯丙氧基苯甲酸膽固醇酯(ACB)/甲基丙烯酸β-羥乙酯(HEMA)/液晶(LC)/光引發劑(IRG-651)/玻璃微珠(SP-220)復合體系,在紫外光照射下制備了聚合物分散液晶(PDLC)薄膜.結果表明:雖然ACB沒有參與聚合,但卻明顯地提高了PDLC薄膜的對比度.在紫外光(365.0 nm)輻照度為15.0 mW·cm^-2、照射溫度為303.2 K、照射時間為10.0 min的條件下,ACB/HEMA/LC/IRG-651/SP-220的比例(質量分數)為6.2%/18.5%/74.0%/0.3%/1.0%時,所制備的PDLC薄膜具有高對比度和較佳的電-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.