The surface rubbing effect on morphologies of LC droplets and electro-optic properties of flexible PDLC films  

作　　者：LIU GuoZhu XIA DuLing YANG WenJun HUANG ZiQiang 

机构地区：[1]State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China [2]School of Optoelectronic Information,University of Electronic Science and Technology of China,Chengdu 610054,China [3]No.58 Research Institute,China Electronics Technology Group Corporation,Wuxi 214035,China

出　　处：《Science China Chemistry》2009年第12期2329-2335,共7页中国科学（化学英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 20672115, 20875094 & 20532030);Ministry of Science and Technology of China (Grant No. 2007CB808005), and the Chinese Academy of Sciences

摘　　要：The flexible polymer dispersed liquid crystal (PDLC) film with threshold voltage V10 and saturation driving voltage V90 as low as 0.34 V/μm and 0.77 V/μm,respectively,has been prepared successfully by polymerization induced phase separation (PIPS). The surface rubbing effect on morphologies of liquid crystals (LC) droplets and electro-optic properties of PDLC films has been studied experimentally and theoretically. We use a CVC (Color Video Camera) and a SEM (Scan Electron Microscope) to detect and characterize morphologies of LC droplets in the net of polymer. The result reveals that almost all the smaller LC droplets exhibit in the rubbing direction uniformly,and the texture of PDLC is similar to that of H-PDLC. Meanwhile,compared with the sample of the non-rubbing disposal,the response time declines evidently by 11.2 ms (i.e.,the rising time τrise) and 27.2 ms (i.e.,the decaying time τdown),and the contrast ratio is improved from 18.5 to 35.9. Such a result can be attributed to the surface rubbing effect.The flexible polymer dispersed liquid crystal (PDLC) film with threshold voltage V 10 and saturation driving voltage V 90 as low as 0.34 V/μm and 0.77 V/μm, respectively, has been prepared successfully by polymerization induced phase separation (PIPS). The surface rubbing effect on morphologies of liquid crystals (LC) droplets and electro-optic properties of PDLC films has been studied experimentally and theoretically. We use a CVC (Color Video Camera) and a SEM (Scan Electron Microscope) to detect and characterize morphologies of LC droplets in the net of polymer. The result reveals that almost all the smaller LC droplets exhibit in the rubbing direction uniformly, and the texture of PDLC is similar to that of H-PDLC. Meanwhile, compared with the sample of the non-rubbing disposal, the response time declines evidently by 11.2 ms (i.e., the rising time τrise) and 27.2 ms (i.e., the decaying time τdown), and the contrast ratio is improved from 18.5 to 35.9. Such a result can be attributed to the surface rubbing effect.

关 键 词：polymer dispersed liquid crystal (PDLC) SURFACE RUBBING EFFECT MORPHOLOGIES threshold voltage 

分 类 号：O753.2[理学—晶体学]