Stability of phenyl-isothiocyanate liquid crystal materials
Phenyl isothiocyanate compounds can be used to produce nematic liquid crystal materials with high birefringence.These materials can simultaneously possess high birefringence and low viscosity,and can achieve rapid response in liquid crystal optical devices.However,this type of liquid crystal material is considered to have stability problems,and it is believed that the liquid crystal devices made from it cannot maintain stable operation for a long time.This study found that in accelerated aging experiments,the birefringence of the material decreased by 8.5%after 1 000 h of treatment at 100℃.Then,the reasons for the poor stability of isothiocyanate liquid crystal compounds were analyzed by high-performance liquid chromatography and mass spectrometry,confirming that hydroxyl compounds can cause the dissociation of isothiocyanate groups.Finally,the stability of the material was tested in the designed anhydrous environment,and it was shown that the degradation degree of the material was significantly reduced,with a decrease in birefringence of 1.1%under the same conditions.The research in this paper will provide some guidance for the application of such materials.
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