固化光强和单体浓度对聚合物稳定液晶器件电光性能的影响
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摘要
采用聚合引发相分离法(polymerization-induced phase separation,PIPS)制备了聚合物稳定液晶(PSLC)器件,利用光谱仪研究了聚合过程中不同的固化光强和单体浓度对PSLC器件电光特性的影响.结果表明,固化光强和单体浓度对PSLC器件的电光性能均有重要影响.在一定范围内,光强过小,光聚合不充分,造成阈值电压降低;光强增大,阈值电压会变高.单体浓度过低,形成的聚合物网络不稳固,导致异常的电光性能;单体浓度过大会导致阈值电压过高.
Polymer stabilized liquid crystal(PSLC) devices were prepared by polymerization-induced phase separation(PIPS) process.Spectrometer was used to investigate the influence of different curing light intensities and monomer concentrations on the electro-optical properties of PSLC device.Results showed that both curing light intensity and monomer concentration had important effects on the electro-optical properties of PSLC device.Within a certain range,low light intensity caused inadequate photopolymerization,which led to low threshold voltage;threshold voltage increased with the increase of light intensity.Low monomer concentration caused unstable polymer network and unusual electro-optical characteristic.Excessive monomer concentration led to high threshold voltage.
Polymer stabilized liquid crystal(PSLC) devices were prepared by polymerization-induced phase separation(PIPS) process.Spectrometer was used to investigate the influence of different curing light intensities and monomer concentrations on the electro-optical properties of PSLC device.Results showed that both curing light intensity and monomer concentration had important effects on the electro-optical properties of PSLC device.Within a certain range,low light intensity caused inadequate photopolymerization,which led to low threshold voltage;threshold voltage increased with the increase of light intensity.Low monomer concentration caused unstable polymer network and unusual electro-optical characteristic.Excessive monomer concentration led to high threshold voltage.
引文
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[14] 黄子强.液晶显示原理[M].北京:国防工业出版社,2008.
[15] 黄家贤,朱端慧,冯亚凯.不饱和体系光聚合动态过程的研究[J].高分子材料科学与工程,1994 (5):36-40.
[16] COLLINGS P J.液晶—自然界中的奇妙物相[M].阮丽真,译.上海:上海科技教育出版社,2002.
[2] 王盼盼.聚合物网络液晶[D].南京:东南大学,2016.
[3] 石海兵,黄子强.低阈值电压聚合物网络液晶电光特性的研究[J].液晶与显示,2008,23(1):21-25.
[4] REN H W,WU S T.Reflective reversed-mode polymer stabilized cholesteric texture light switches[J].Journal of Applied Physics,2002,92(2):797-800.
[5] 于美娜.反式液晶/聚合物分散薄膜的制备及光电性能研究[D].成都:四川大学,2007.
[6] DIERKING I.Polymer network-stabilized liquid crystals[J].Advanced Materials,2000,12(3):167-181.
[7] YAROSHCHUK O,ELOUALI F,MASCHKE U.Control of phase separation and morphology of thiol-ene based PDLCs by curing light intensity[J].Optical Materials,2010,32(9):982-989.
[8] ABDOUNE F Z,BENKHALED L,MéCHERNèNE L,et al.Investigation of the electro-optical behaviour of UV-cured polymer/liquid crystal systems[J].Physics Procedia,2009,2(3):643-648.
[9] 任洪文,黄锡珉,王庆兵.PDLC的电光特性及其显示特性改善的实验研究[J].液晶通讯,1995,3(3):170-184.
[10] 刘国柱,黄子强,杨文君,等.低阈值电压聚合物分散性液晶膜的电光特性[J].液晶与显示,2009,24(3):383-388.
[11] 王守廉,唐秀之,何杰,等.聚合物结构对聚合物网络稳定液晶薄膜电光性能的影响[J].高分子材料科学与工程,2008,24(1):63-66.
[12] 王晓安,何杰,阎斌,等.聚合物网络液晶电光性能的研究[J].液晶与显示,2007,22(4):372-377.
[13] 初天宇.聚合物稳定胆甾相液晶网络形变的表征和控制及其对光电性能的影响[D].合肥:合肥工业大学,2017.
[14] 黄子强.液晶显示原理[M].北京:国防工业出版社,2008.
[15] 黄家贤,朱端慧,冯亚凯.不饱和体系光聚合动态过程的研究[J].高分子材料科学与工程,1994 (5):36-40.
[16] COLLINGS P J.液晶—自然界中的奇妙物相[M].阮丽真,译.上海:上海科技教育出版社,2002.