为了调控聚合物分散液晶(PDLC)中聚合物基体和液晶微滴的界面作用,降低锚定能,以聚丙烯酸甲酯(PMA)为基体,E7为分散相,并加入了不同含量的硬脂酸(SA)表面活性剂,采用聚合物诱导相分离法制备了PDLC,并对PDLC的光电性能进行了测试.研究发现,PDLC的电光性能随着SA含量的增加而改善,但当SA的含量达到一定值后,液晶微滴出现"岛聚"现象,光电曲线出现一个转折点.实验结果表明,表面活性剂可以调控聚合物和液晶微滴的界面作用,降低锚定能,从而改善PDLC的光电性能.
Polymer dispersed liquid crystal(PDLC) is a kind of new display material. It has a lot of advantages. Anchoring energy,as an important factor of PDLC,has a great influence on electro-optical properties. In this letter, a small amount of stearic acid(SA) was added into PDLC. With the increase of SA, the anchoring energy was reduced, which leads to a re-duction in driving voltages and an improvement in the ON state transmittance. However, the ON state transmittance decreased when the concentration of SA exceeded 0. 5%. Besides,with the decrease of anchoring energy, the hysteresis increased. It demonstrated that SA do reduced the anchoring energy and improved electro-optical properties of PDLC.
参考文献
| [1] | Spruce G,Pringle R D.Polymer dispersed liquid crystal(PDLC)films[J].Electronics and Communication Engineering Journal,1992,4(2):91-100. |
| [2] | Pamaik S S,Pachter R.Anchoring characteristics and interfacial interactions in polymer dispersed liquid crystal:A moleeular dynamics study/-Jl.Polymer,1999,40(23):6507-6519. |
| [3] | Higgins D A.Probing the mesoseopie chemical and physieal properties of polymer-dispersed liquid crystal[J].Advanced Materials,2000,12(4):251-264. |
| [4] | 马骥,刘永刚,胡立发.交联剂对聚合物/液晶光栅的影响[J].液晶与显示,2005,20(4):273-277. |
| [5] | Shim S S,Woo J Y,Kim K H,et al.Effects of surfaetant and molecular weight of polyol on grating formation and switching of holographic PDLC[,J].Adv.Technol,2008,19:1550-1557. |
| [6] | Woo J Y,Kim B K.Surfaetant effects on morphology and switching of holographic PDLCs based on polyurethane acrylates[J].Chem.Phys.Chem.,2007,8:175-180. |
| [7] | Nomura H,Suzuki S,Atarashi Y.Interfaeial interaction between nematic liquid crystal and polymer in the composite film consisting of nematie liquid crystal and connected polymer microspheres[J].Jpn.J.Appl.Phys.,1991,30(2):327-330. |
| [8] | Klosterman J,Natarajan L V,Tondiglia V P,et al.The influence of surfactant in reflective HPDLC gratings[J].Polymer,2004,45:7213-7218. |
| [9] | 任娇燕,冯亚云,崔宏青,等.采用复合催化剂体系制备PDLC及其性能研究[J].液晶与显示,2008,23(1):39-42. |
| [10] | 郭福忠,郑致刚,宋静,等.表面活性剂含量对全息聚合物分散液晶光栅电光性能的影响[J].光子学报,2008,37(9):1730-1733. |
| [11] | Liu Y J,Sun X W,Dai H T,et al.Effects of surfactant on the electro-optical properties of holographic polymer dispersed liquid crystal bragg gratings[J].Optical Materials,2005,27:1451-1455. |
| [12] | 宋静,刘永刚,郑志刚,等.增塑剂对全息聚合物分散液晶光栅衍射性能的影响[J].液晶与显示,2008,23(5):545-548. |
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