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首页> 外文期刊>Crystallography reports >Investigation into the structure of Langmuir-Blodgett films prepared from salts of acetylenic acids
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Investigation into the structure of Langmuir-Blodgett films prepared from salts of acetylenic acids

机译：由乙炔酸盐制备的Langmuir-Blodgett膜的结构研究

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Langmuir-Blodgett films are prepared from lead, cadmium, and copper salts of carboxylic acids, namely, 23-tetracosynoic acid HC=C(CH2)(21)COOH (with the terminal triple bond) and 2-docosynoic acid CH3(CH2)(18)C=CCOOH (with the internal triple bond). The structural transformations in the films during polymerization under exposure to UV radiation are investigated using X-ray reflectomertry. It is found that the X-ray reflectograms of the initial films prepared from salts of both acids exhibit no less than four or five pronounced intense Bragg reflections. This suggests that the initial films have good layer ordering. The bilayer periods for all the films are determined, and the influence of the salt type on the bilayer period is analyzed. It is established that, under exposure to UV radiation, the structural transformations in the films prepared from the salts of 23-tetracosynoic acid occur without substantial disturbances and defects, as can be judged from the absence of significant changes in the location and intensity of the Bragg reflections. An increase in the time of irradiation of the films prepared from the salts of 2-docosynoic acid leads to an increase in the bilayer period. This effect is especially pronounced for the lead and copper salts. However, upon long-term exposure to UV radiation, the salts undergo photolysis, the bilayer period decreases, and the structure of the film begins to break down. (C) 2005 Pleiades Publishing, Inc.
机译：Langmuir-Blodgett膜是由羧酸的铅盐，镉盐和铜盐制成的，即羧酸的23-四丁香酸HC = C（CH2）（21）COOH（带有末端三键）和2-二十二碳六烯酸CH3（CH2） （18）C ＝ CCOOH（具有内部三键）。使用X射线反射仪研究了在暴露于紫外线辐射下聚合过程中薄膜的结构转变。发现由两种酸的盐制备的初始膜的X射线反射图显示不少于四或五个明显的强烈布拉格反射。这表明初始膜具有良好的层序。确定所有膜的双层周期，并分析盐类型对双层周期的影响。已经确定，在暴露于UV辐射下，由23-四羟壬酸的盐制备的膜中的结构转变发生而没有实质性的干扰和缺陷，这可以从不存在显着变化的位置和强度来判断。布拉格的几点思考。由2-二十二碳五烯酸的盐制备的膜的辐照时间增加导致双层时间增加。对于铅盐和铜盐，这种效果尤其明显。然而，长期暴露于紫外线辐射后，盐会发生光解，双层时间会减少，并且膜的结构开始破裂。 （C）2005年Pleiades Publishing，Inc.

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