光敏聚合物薄膜光化学性能及其诱导液晶分子取向性能的研究
|
摘要
本文采用动态紫外光谱法测试了含有香豆素光敏基团的聚合物薄膜的光化学性能,考察了不同曝光温度和曝光能量条件下的光敏聚合物的光化学性能,以及不同热处理条件下聚合物薄膜诱导液晶分子取向性能。研究结果表明:在曝光温度为130℃时,聚合物薄膜在最小曝光量下发生光化学反应后产生的光学各向异性ΔA达到最大,并且对应光反应程度DP在45%左右;当曝光能量为320mJ/cm~2和384mJ/cm~2、对应热处理温度为160℃时,聚合物薄膜诱导液晶分子取向所产生的各向异性ΔA和有序度参数S达到最大,分别为0.22和0.048。
In this article,an ultraviolet spectrum method was used to measure the photoreaction property of polymer film containing coumarin photosensitive group.The photochemical reaction property of the film corresponding to the different exposure temperature and the different exposure energy were investigated.The orientation performance of liquid crystal induced by the film at different annealing conditions was also conducted.The results indicate that when the exposure temperature is 130℃,the value of anisotropyΔAof the polymer film gets to the maximum and the corresponding exposure energy is the minimum.At the same time,the degree of photoreaction is about 45%.When the exposure energy achieve 320mJ/cm2 and 384mJ/cm2,and the annealing temperature is 160 ℃,the induced value of anisotropyΔA and order parameter Sis 0.22and0.048,respectively.
In this article,an ultraviolet spectrum method was used to measure the photoreaction property of polymer film containing coumarin photosensitive group.The photochemical reaction property of the film corresponding to the different exposure temperature and the different exposure energy were investigated.The orientation performance of liquid crystal induced by the film at different annealing conditions was also conducted.The results indicate that when the exposure temperature is 130℃,the value of anisotropyΔAof the polymer film gets to the maximum and the corresponding exposure energy is the minimum.At the same time,the degree of photoreaction is about 45%.When the exposure energy achieve 320mJ/cm2 and 384mJ/cm2,and the annealing temperature is 160 ℃,the induced value of anisotropyΔA and order parameter Sis 0.22and0.048,respectively.
引文
[1]周期凤,王新久.液晶高分子[M].北京:科学出版社,1994.1-116.Zhou Q F,Wang X J.Polymer Liquid Crystal[M].Beijing:Science Press,1994.1-116.
[2]Kunihiro Ichimura.Photoalignment of liquid-crystal systems[J].Chemical Reviews,2000,100(5):1847-1874.
[3]李巍,高志强,密保秀.液晶取向技术[J].南京邮电大学学报,2009,4:90-96.Li Wei,Gao Z Q,Mi B X.Progress in the liquid crystal alignment[J].Journal of Nanjing University of Posts and Telecommunication,2009,4:90-96.
[4]马颖,张方辉,盛锋.液晶显示器摩擦取向技术的新发展[J].液晶与显示,2003,18(4):279-285.Ma Y,Zhang F H,Sheng F.Progress of research on rubbing alignment techniques for LCD[J].Journal of Liquid Crystals and Displays,2003,18(4):279-285.
[5]Schadt M,Schmitt K,Kozinkov V,Chigrinov V.Surface-induced parallel alignment of liquid crystals by linearly polymerized photopolymers[J].Japanese Journal of Applied Physics,1992,31(7):2155-2164.
[6]Chigrinov V G,Kozenkov V M,Kwok H.Photoalignment of Liquid Crystalline Materials.Physics and Applications[M].Wiley,2008.
[7]Angiolini L.Smart light-responsive materials.azobenzenecontaining polymers and liquid crystals[J].Macromolecular Chemistry and Physics,2010,211(4):481.
[8]Nobuhiro K,Hitomi M,Mizuho K,Tomoyuki S,Hiroshi O.Photoinduced reorientation and polarization holography in a new photopolymer with 4-methoxy-N-benzylideneaniline side groups[J].Applied Matter,2013,1(2):2477-2481.
[9]纪小妹,焦阳,魏杰.液晶光定向材料研究进展[J].信息记录材料,2008,9:33-41.Ji X M,Jiao Yang,Wei Jie.Development of researchon LC light control materials[J].Information Recording Material,2008,9:33-41.
[10]Peter S,Isabel M,Saez.Side chain liquid crystal polyacrylate and polymethacrylate nickel complexesfree from covalent cross-linking[J].Molecular Crystals and Liquid Crystals,2004,411(1):491-502.
[11]Schadt M,Seiberle H,Schuster A.Optical patterning of multidomain liquid-crystal displays with wide viewing angles[J].Nature,1996,381:212-215.
[12]Kawatsuki N,Matsuyoshi K,Hayashi M,Takatsuka H,Yamamoto T.Photoreaction of photo-cross-linkable methacrylate polymer films comprising 2-cinnamoyloxyethoxybiphenyl side group by linearly polarized ultraviolet light and liquid crystal alignment on the resultant films[J].Chemistry of Materials,2000,12(6):1549-1555.
[13]Obi M,Morino S,Ichimura K.Photocontrol of liquid crystal alignment by polymethacrylates with diphenylacetylene side chains[J].Chemistry of Materials,1999,11(5):1293-1301.
[14]Obi M,Morino S,Ichimura K.The reversion of photoalignment direction of a liquid crystal induced by apolymethacrylate with coumarin side chains[J].Macromolecular Rapid Communications,1998,19(12):643-646.
[15]Jackson P O,Bergmann G,Hogg J H C,O’Neill M.Grazing incidence X-ray reflectivity of coumarin side-chain polymers used for liquid crystal photoalignment layers[J].Synthetic Metals,2002,127(s1-3):95-98.
[16]Jackson P O,O’Neill M.An investigation of the role of cross-linking and photodegradation of side-chain coumarin polymers in the photoalignment of liquid crystals[J].Chemistry of Materials,2001,13(2):694-703.
[17]冯利邦,方红霞,周树学,顾广新,武利民.一步法制备聚二甲基硅氧烷大分子偶氮引发剂及其用于嵌段共聚物的合成[J].高分子学报,2007,(5):472-477.Feng L B,Fang H X,Zhou S X,Gu G X,Wu L M.Synthesis of PDMS-containing macroazoinitiator by one step method and its application in preparation of block copolymers[J].Acta Polymerica Sinica,2007,(5):472-477.
[18]Michael P,Ringsdorf H,Zentel R.Synthesis and phase behaviour of liquid crystalline polyacrylates[J].Die Makromolekulare Chemie,Macromolecular Symposia,1982,183(10):2311-2321.
[19]Macdonald R,Schulz R,Schreiber C.Polarization-induced orientational order and surface relief gratings in liquid crystalline polymers containing photosensitive azochromophores[J].Proceedings of SPIE,1999,3800.
[20]Hiroshi S,Kouki T,Mizuho K,Nobuhiro K.Photoinduced cooperative orientation and pattern formation in copolymer films with 4-methoyazobenzene and benzoic acid side groups[J].Molecular Crystals and Liquid Crystals,2012,563(1):131-138.
[21]Nobuhiro K,Masaki H,Tohei Y.Alignment of photocrosslinkable copolymer liquid crystals induced by linearly polarized ultraviolet light irradiation and annealing:effect of heating rate[J].Macromolecular Chemistry and Physics,2001,202:3087-3098.
[2]Kunihiro Ichimura.Photoalignment of liquid-crystal systems[J].Chemical Reviews,2000,100(5):1847-1874.
[3]李巍,高志强,密保秀.液晶取向技术[J].南京邮电大学学报,2009,4:90-96.Li Wei,Gao Z Q,Mi B X.Progress in the liquid crystal alignment[J].Journal of Nanjing University of Posts and Telecommunication,2009,4:90-96.
[4]马颖,张方辉,盛锋.液晶显示器摩擦取向技术的新发展[J].液晶与显示,2003,18(4):279-285.Ma Y,Zhang F H,Sheng F.Progress of research on rubbing alignment techniques for LCD[J].Journal of Liquid Crystals and Displays,2003,18(4):279-285.
[5]Schadt M,Schmitt K,Kozinkov V,Chigrinov V.Surface-induced parallel alignment of liquid crystals by linearly polymerized photopolymers[J].Japanese Journal of Applied Physics,1992,31(7):2155-2164.
[6]Chigrinov V G,Kozenkov V M,Kwok H.Photoalignment of Liquid Crystalline Materials.Physics and Applications[M].Wiley,2008.
[7]Angiolini L.Smart light-responsive materials.azobenzenecontaining polymers and liquid crystals[J].Macromolecular Chemistry and Physics,2010,211(4):481.
[8]Nobuhiro K,Hitomi M,Mizuho K,Tomoyuki S,Hiroshi O.Photoinduced reorientation and polarization holography in a new photopolymer with 4-methoxy-N-benzylideneaniline side groups[J].Applied Matter,2013,1(2):2477-2481.
[9]纪小妹,焦阳,魏杰.液晶光定向材料研究进展[J].信息记录材料,2008,9:33-41.Ji X M,Jiao Yang,Wei Jie.Development of researchon LC light control materials[J].Information Recording Material,2008,9:33-41.
[10]Peter S,Isabel M,Saez.Side chain liquid crystal polyacrylate and polymethacrylate nickel complexesfree from covalent cross-linking[J].Molecular Crystals and Liquid Crystals,2004,411(1):491-502.
[11]Schadt M,Seiberle H,Schuster A.Optical patterning of multidomain liquid-crystal displays with wide viewing angles[J].Nature,1996,381:212-215.
[12]Kawatsuki N,Matsuyoshi K,Hayashi M,Takatsuka H,Yamamoto T.Photoreaction of photo-cross-linkable methacrylate polymer films comprising 2-cinnamoyloxyethoxybiphenyl side group by linearly polarized ultraviolet light and liquid crystal alignment on the resultant films[J].Chemistry of Materials,2000,12(6):1549-1555.
[13]Obi M,Morino S,Ichimura K.Photocontrol of liquid crystal alignment by polymethacrylates with diphenylacetylene side chains[J].Chemistry of Materials,1999,11(5):1293-1301.
[14]Obi M,Morino S,Ichimura K.The reversion of photoalignment direction of a liquid crystal induced by apolymethacrylate with coumarin side chains[J].Macromolecular Rapid Communications,1998,19(12):643-646.
[15]Jackson P O,Bergmann G,Hogg J H C,O’Neill M.Grazing incidence X-ray reflectivity of coumarin side-chain polymers used for liquid crystal photoalignment layers[J].Synthetic Metals,2002,127(s1-3):95-98.
[16]Jackson P O,O’Neill M.An investigation of the role of cross-linking and photodegradation of side-chain coumarin polymers in the photoalignment of liquid crystals[J].Chemistry of Materials,2001,13(2):694-703.
[17]冯利邦,方红霞,周树学,顾广新,武利民.一步法制备聚二甲基硅氧烷大分子偶氮引发剂及其用于嵌段共聚物的合成[J].高分子学报,2007,(5):472-477.Feng L B,Fang H X,Zhou S X,Gu G X,Wu L M.Synthesis of PDMS-containing macroazoinitiator by one step method and its application in preparation of block copolymers[J].Acta Polymerica Sinica,2007,(5):472-477.
[18]Michael P,Ringsdorf H,Zentel R.Synthesis and phase behaviour of liquid crystalline polyacrylates[J].Die Makromolekulare Chemie,Macromolecular Symposia,1982,183(10):2311-2321.
[19]Macdonald R,Schulz R,Schreiber C.Polarization-induced orientational order and surface relief gratings in liquid crystalline polymers containing photosensitive azochromophores[J].Proceedings of SPIE,1999,3800.
[20]Hiroshi S,Kouki T,Mizuho K,Nobuhiro K.Photoinduced cooperative orientation and pattern formation in copolymer films with 4-methoyazobenzene and benzoic acid side groups[J].Molecular Crystals and Liquid Crystals,2012,563(1):131-138.
[21]Nobuhiro K,Masaki H,Tohei Y.Alignment of photocrosslinkable copolymer liquid crystals induced by linearly polarized ultraviolet light irradiation and annealing:effect of heating rate[J].Macromolecular Chemistry and Physics,2001,202:3087-3098.