以对苯二胺、3-氯丙醇和4-羟基苯甲醛为原料,合成对苯二(对苯丙氧基醇)亚胺液晶基元,再与对苯二异氰酸酯和1,3-双(3-氨基丙基)四甲基二硅氧烷反应,合成席夫碱型硅氧烷聚氨酯液晶聚合物.通过红外光谱法、X射线衍射、热分析、偏光显微镜等技术手段对其结构和性能进行了表征.结果表明,该物质为席夫碱有机硅聚氨酯液晶聚合物,属于近晶相液晶,液晶区间为103 ～ 150℃,热分解温度为300℃.用席夫碱型硅氧烷聚氨酯液晶固定相制备填充色谱柱,考察固定液的相对极性及其对取代苯位置异构体的色谱分离性能.合成的席夫碱型硅氧烷聚氨酯液晶聚合物的液晶温度范围为103～146℃,属于强极性固定液(Px=79),各组分色谱峰的分离度为0.96～3.33.
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