Liquid crystal polysiloxanes with a lateral 4-(4-cyanophenoxycarbonyl)phenyl 4-(2-perfluoroalkylethoxy)-2-propyleneoxybenzoate side group and a 4-decyloxy-2-propyleneoxy-benzoate hydrocarbon analogue were prepared, and the mesomorphic properties were determined by the microscopic observation and differential scanning calorimeter (DSC) thermogram, and the layer structure of the smectic A phase was characterized by an X-ray diffraction experiment. The introduction of the perfluoroalkyl chain to the polymer remarkably enhances the smectic properties due to the strong fluorophilic interactions around the perfluoroalkyl chain. The effect of the perfluoroalkyl chain on the monolayer formation was studied at the air–water interface. The surface pressure–area isotherms show that the perfluoroalkyl chain enhances the stability of the monolayer versus surface pressure. In the condensed state the cyano group in the side chain is assumed to be anchored on the water surface and the mean axis of the liquid crystal core is approximately normal to the water surface. The monolayers were easily deposited on a hydrophobic glass slide, giving uniform Langmuir–Blodgett (LB) films by the vertical deposition method. The X-ray diffraction results indicate that the perfluorooctyl chain effectively stabilizes the layer structure in the multilayer LB film at room temperature. The side chain monomers also show a similar behavior to the polymers and give uniform LB films on hydrophobic glass slides.

卟啉类化合物具有良好的电子转移和能量传递的功能 [1]，是很好的光敏剂和氧化还原剂 [2] 血卟啉及其衍生物在恶性肿瘤临床诊断及治疗中已得到应用 [3]，文献 [4] 曾研究了6种无脂链卟啉在花生酸单分子膜中的镶嵌行为，其结果是卟啉被挤出花生酸单分子层成团聚集。并用sEM直接观察到混合膜的相分离现象。本文是这一工作的继续、血卟啉分子自身在液一气界面上有一定的成膜能力，但稳定性较差，难于在固体基片上沉积、将血卟啉与硬脂酸混 合时，两者在单分子膜内有较好的相容性，易于沉积在固体基片上。

The Langmuir film behavior of fluorine-containing side chain liquid crystal copolysiloxanes at the air-water interface has been studied over a temperature range of 277.5-310K. The surface pressure-area isotherms exhibited a transition from an expanded to a condensed phase. In the expanded phases the main chains of the polymers were anchored at the air-water interface. In the condensed phases the extension or partial exclusion of the main chains at the air-water interface was mainly controlled by the cross-sectional area of the side chain. The transferred Langmuir-Blodgett LB multilayer did not give any X-ray diffraction peak. With heating, a molecular ordering of the LB film was induced so that the film showed the Bragg diffraction peak.

In this paper, Langmuir-Blodgett films of hematoporphyrin mixed with stcaric acid have been investigated. It was found that hematoporphyrin molecules were inlaid in monolayers of stearic acid. The UV-vis spectra of the LB films showed that there wasn't strong interaction between ematoporphyrin molecules when compared with the solution spectrum. The particular orientation of hematoporphyrin macrocycle in LB f'dm was con-firmed by polarized' UV-vis spectra.

This paper describes the phase transition behavior of a copolysiloxane (1) bearing a 4-cyanophenyl benzoate core at the terminal of the side chain. While polymer 1 exhibits only a nematic phase in bulk, it easily forms layer structures involving monolayer, trilayer, and complex multilayers at the air-water interface. In the monolayer state the cyano groups are anchored on the water surface and the aromatic moieties involving the copolysiloxane chain are directed towards the air phase. The trilayer has a partially bilayer structure on the top of the monolayer, where the layer structure was confirmed by X-ray diffraction measurement of the LB films, giving the layer spacing of 1.47 times of the calculated side chain length. Complex multilayer transitions were also observed by a further compression or changing subphase temperature.