本文设计合成了含有香豆素光敏基团的单体4-(6-丙烯酰氧基己氧基)苯甲酸-7-羟基香豆素酯(M1)和一种只含液晶基元的单体4-(丙烯酰氧基)己基苯甲酸-4-甲氧基苯酚酯(M2),并将这两种单体进行自由基聚合得到了共聚物.当该聚合物薄膜置于线性偏振紫外光(LPUV)下,会发生轴选择性的光化学反应,利用动态紫外光谱(UV光谱),对所合成的共聚物的光化学性能进行了研究.结果表明:当曝光能量为1740 mJ/cm2时,光反应达到饱和,紫外吸光度将不随曝光能量的变化而变化;随着曝光能量的增加,聚合物在反应初期光反应速率比较大,当曝光能量达到500 mJ/cm2左右,光反应度已经超过50％;当曝光量达到324 mJ/cm2,各向异性△A达到最大,△Amax=0.039.
参考文献
| [1] | 周期凤;王新久.液晶高分子[M].北京:科学出版社,1994:1-116. |
| [2] | Kunihiro Ichimura .Photoalignment of Liquid-Crystal Systems[J].Chemical Reviews,2000(5):1847-1873. |
| [3] | Gibbons W M;Shannon P J;Sun S T et al.Swetlin,surface-mediated alignment of nematic liquid crystals with polarized laser light[J].Nature,1991,351:49-50. |
| [4] | Kang H;Kang D;Lee JC .Liquid crystal alignment properties of polystyrene derivatives containing coumarin side groups[J].Liquid Crystals: An International Journal in the Field of Anisotropic Fluids,2008(8):1005-1013. |
| [5] | 纪小妹,JIAO Yang,董晓明,WEI Jie,冯振基,SONG Xiao-chun.液晶光定向材料研究进展[J].信息记录材料,2008(04):33-41. |
| [6] | Peter Styring;Isabel M. Saez .SIDE CHAIN LIQUID CRYSTAL POLYACRYLATE AND POLYMETHACRYLATE NICKEL COMPLEXES FREE FROM COVALENT CROSS-LINKING[J].Molecular crystals and liquid crystals,2004(0):491-502. |
| [7] | Peregrine Orr Jackson;Mary O'Neill;Warren Lee Duffy;Paul Hindmarsh;Stephen Malcom Kelly;Stephen Malcom Kelly .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(2):694-703. |
| [8] | 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(05):472-477. |
| [9] | Michael P;Ringsdorf H;Zentel R .Synthesis and phase behaviour of liquid crystalline polyacrylates[J].Die Makromolekulare Chemie,1982,183(10):2311-2321. |
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