在铁电液晶中形成的聚合体网络及其对液晶载体分子组合排列的影响

在灌装于未经表面处理的样品盒内处于不同状态的液晶中制备聚合体网络。液晶／单体混合物由铁电液晶和双丙烯酸单体制成。单体的聚合通过维持该混合物处在一定的液晶态的条件下经紫外线固化来完成。不同的液晶态可通过控制铁电液晶的温度来获得。双丙烯酸单体或聚合体网络的存在会导致铁电液晶载体的相变温度降低。通过光学显微镜可观察聚合体网络对铁电液晶分子组合排列的影响。结果发现：在某一液晶态中铁电液晶分子的组合排列可被在该液晶态中聚合而成的聚合体网络所稳定，双丙烯酸基聚合体网络的存在可改良铁电液晶的电光开关特性。

Polymer Network Formed in a Ferroelectric Liquid Crystal and Its Influences on the Molecular Packing Arrangement of the Liquid Crystal Host of the Liquid Crystal Host

Polymer networks have been produced in a variety of liquid crystal phases in cells without surface treatment.The liquid crystal/monomer mixtures are prepared using a ferroelectric liquid crystal and a diacrylate monomer.The polymerisation of the monomer is carried out by UV curing the mixture when it was kept in a specific phase which can be obtained by controlling the temperature of the ferroelectric liquid crystal.Both the monomer and the polymer network will depress phase transition temperatures.The effects of the polymer network on the packing arrangement of the ferroelectric liquid crystal molecules are examined by means of optical microscopy.The molecular packing arrangement of the ferroelectric liquid crystal in a specific mesogenic phase is frozen on the formation of a polymer network in the ferroelectric liquid crystal in that phase.The existence of the diacrylate based polymer network can improve the electrooptical switching of the ferroelectric liquid crystal.