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对联苯乙炔类液晶单体的紫外稳定性进行了研究。实验数据显示:经紫外照射200min后,液晶的阈值电压降低,折射率减小。液晶化合物的UV降解不仅与吸收波长有关,而且还与分子结构有关。本文分析了末端官能基团以及连接基团对此类单体紫外稳定性的影响:联苯乙炔与末端基团为NCS官能团连接的化合物的UV稳定性要优于与CN连接的化合物;并且当以1,4-环己基作为连接基团时化合物的UV稳定性要好于酯基(-COO-)作为连接基团和没有连接基团的化合物。
The UV stability of biphenyl acetylene liquid crystal monomer was studied. Experimental data show that: after UV irradiation 200min, the threshold voltage of liquid crystal decreases, the refractive index decreases. UV degradation of liquid crystal compounds not only with the absorption wavelength, but also with the molecular structure. In this paper, the effects of terminal functional groups and linking groups on the UV stability of these monomers were analyzed: the UV stability of diphenylacetylene with the terminal groups attached to the NCS functional groups was better than that of the CN-linked compounds; and when The UV stability of the compounds with 1,4-cyclohexyl as the linker is better than the ester (-COO-) as the linker and without the linker.