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研究了液晶分子的排列方式对聚合物膜阻隔特性的影响,采用473 nm线偏振光照无定形偶氮液晶聚合物,使其介晶基元发生从无序到有序的取向排列.用膜透射率变化和锥光干涉图表征了分子的取向,其锥光干涉图为粗黑十字,说明在线偏振光下作用下液晶分子取向形成了单相畴沿面内排列的有序态.用金属表面氧化法进一步研究了取向态聚合物膜的阻隔性能.实验结果表明,取向后膜对水和氧气的阻隔性约为多相畴热致液晶相的1.25倍,是无定型态膜的2.5倍.光致取向使光照区域内所有介晶基元沿偏振光电矢量垂直方向排列,形成为整体的单相畴有序区,相当于消除了热致液晶相中多相畴液晶微相区之间的可渗透的无序区,因此光致取向能显著提高液晶聚合物膜的阻隔性能.
The influence of the arrangement of liquid crystal molecules on the barrier properties of polymer films was investigated. The amorphous azo liquid crystal polymer (473 nm) was used to orient the mesogenic elements from disordered to ordered orientation. The rate of change and the cone of interference interferometer to characterize the molecular orientation, the cone of light interference diagram for the black cross, indicating the role of linear polarized light under the action of the liquid crystal molecules aligned to form a single-phase domain along the in-plane ordered state with metal surface oxidation The barrier properties of oriented polymer films were further studied.The experimental results show that the barrier properties of the oriented films to water and oxygen are about 1.25 times that of the polyphase thermotropic liquid crystal phase and 2.5 times that of the amorphous state film. Photoinduced alignment causes all the mesogenic elements in the illuminated area to be aligned in the vertical direction of the polarization vector to form a monolithic single-phase domain ordered area, which is equivalent to the elimination of the heterogeneity between the multiphase liquid crystal microdomains in the thermotropic liquid crystal phase Permeable and disordered zone, the photo-alignment can significantly improve the barrier property of the liquid crystal polymer film.