通过两次光照法制备了一种基于共价键结构的自组装光控取向膜.首先采用重氮树脂与聚(4-丙烯酰氧基肉桂酸(4′-磺酸钠)苯酚酯)在水溶液状态下通过静电离子沉积法制备了layer-by-layer型的自组装多层膜,制备过程的紫外-可见光谱表明薄膜为逐层、均匀沉积.第一次光照将膜层间的重氮磺酸盐离子键转化为共价键结构,然后采用线性偏振紫外光进行第二次光照,获得具有各向异性的光控取向膜.紫外-可见光谱法证实了薄膜辐照过程中的光化学反应方式.这种液晶光控取向膜可以水平均匀取向向列相液晶,而且具有良好的热稳定性,可达到150 ℃.
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