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西南科技大学 材料科学与工程学院,四川 绵阳 621010
收稿日期:2011-04-19,
修回日期:2011-06-10,
网络出版日期:2011-10-20,
纸质出版日期:2011-10-20
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刘剑, 王明乐, 李园园, 罗海波. 偏振光照对偶氮苯侧链聚硅氧烷膜表面能的提高[J]. 液晶与显示, 2011,26(5): 577-581
LIU Jian, WANG Ming-le, LI Yuan-yuan, LUO Hai-bo. Promotion of Surface Free Energy of Azobenzene Containing Side-Chain Liquid Crystalline Polysiloxane Film by Polarized Light[J]. , 2011,26(5): 577-581
刘剑, 王明乐, 李园园, 罗海波. 偏振光照对偶氮苯侧链聚硅氧烷膜表面能的提高[J]. 液晶与显示, 2011,26(5): 577-581 DOI: 10.3788/YJYXS20112605.0577.
LIU Jian, WANG Ming-le, LI Yuan-yuan, LUO Hai-bo. Promotion of Surface Free Energy of Azobenzene Containing Side-Chain Liquid Crystalline Polysiloxane Film by Polarized Light[J]. , 2011,26(5): 577-581 DOI: 10.3788/YJYXS20112605.0577.
采用硅氢加成法合成了含偶氮苯侧链的聚硅烷液晶聚合物
用FTIR、DSC和偏光显微镜对聚合物结构及液晶特性进行了表征。采用473 nm偏振光对聚合物膜进行了光致取向
用偏光显微镜对取向结果进行了表征
发现偏振光倾斜照射后侧链偶氮苯基团发生了面外垂直取向。采用量高法测量了取向前后膜的接触角
根据接触角计算了膜的表面能。聚合物膜在取向前接触角为94.5
偏振光照射取向后降低为76.5
表明光照使聚合物膜从疏水变为亲水
膜的表面能明显增加。结合锥光显微镜观察到的干涉图结果
提出了极性偶氮苯基团面外垂直排列取向提升膜表面能的机理。
Azobenzene containing side-chain liquid crystalline polymer was synthesized by hydrosilation reaction of poly(methylhydrosiloxane) with the azo monomer. The chemical structure and its liquid crystalline properties were investigated by FITR
DSC and POM with a hot stage. Photo-alignment treatment was performed on the polysiloxane film by using a linearly polarized light source with the wavelength of 473 nm. A static contact angle mea-surement was carried out and the surface free energy was also calculated from the contact angles of a drop of water on the polymer film. The water contact angles was decreased from 94.5 to 76.5 after the light irradiation. We conclude that the changes in the hydrophilic of LC polymer were influenced by the surface compositions upon the photoinduced reorientation of the azobenzene side groups perpendicularly towards the film surface
which was confirmed by conoscopic POM observation results.
李增俊, 沈冬. 含偶氮基团的不对称弯曲型液晶分子的合成及其光谱特性[J]. 液晶与显示, 2011, 26 (3): 274-280.[2] Ichimura K, Oh S K, Nakagawa M. Light-driven motion of liquids on a photoresponsive surface [J]. Science, 2000, 288 (5471):1624-1626.[3] Delorme N, Bardeau J F, Bulou A, et al. Azobenzene-containing monolayer with photoswitchable wettability [J]. Langmuir, 2005, 21 (26):12278-12282.[4] Feng chunliang, Zhang Yanjie, Jin Jian, et al. Reversible wettability of photoresponsive fluorine-containing azobenzene polymer in Langmuir-Blodgett films [J]. Langmuir, 2001, 17(15):4593-4597.[5] 侯昭升, 张其震, 王大庆,等. 偶氮苯侧链共聚硅氧烷的合成及液晶行为的研究[J]. 高分子学报, 2002, (6): 742-745.[6] Zenkiewicz M. New method of analysis of the surface free energy of polymeric materials calculated with Owens-Wendt and Neumann methods [J]. Polimery, 2006, 51 (7-8): 584-587.[7] 张其震, 王艳, 侯建安. 光致变色液晶高分子研究(Ⅲ)含胆甾介晶基元偶氮苯光色基元侧链共聚硅氧烷的液晶行为[J]. 高等学校化学学报, 1994, 15(8):1240-1243.[8] Ikeda T. Photomodulation of liquid crystal orientations for photonic applications [J]. J. Mater. Chem., 2003, 13 (9):2037-2057.[9] Liu J, Wang M, Li Y, et al. Photo-triggered assembly/disassembly of macroscopically ordered monodomain lamellar structure in side-chain liquid crystalline polymer containing strong polar azobenzene mesogens [J]. Liq. Cryst, 2011, 38(1):105 -113.[10] 刘剑, 吴晓华, 王明乐. 偶氮苯型侧链液晶聚合物的阻隔特性研究[J]. 高分子学报, 2010, (10):1231-1237.[11] Jiang W H, Wang G J, He Y N, et al. Photo-switched wettability on an electrostatic self-assembly azobenzene monolayer [J]. Chem. Commun., 2005, (28):3550-3552.[12] 赵东宇, 孟庆勇, 杨光达,等. 自组装法制备新型液晶垂直取向膜[J]. 液晶与显示, 2010, 25(1):62-67.
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