一种反铁电液晶薄膜相变过程的变温红外光谱研究

通过变温红外光谱对反铁电液晶MHOCPOOB薄膜相变过程中的分子构象、排布及相互作用的变化进行了研究.结果表明,室温时,薄膜中的分子烷基链同时含有zigzag和gauche两种构象.随着温度的升高,有序的zigzag构象转化为无序的gauche构象,链的扭曲程度增加.但S*IA到S*CA的转变并不引起烷基链构象和取向发生明显变化.刚性核中的羰基与相邻的苯环形成共轭体系,苯环之间相互倾斜排列,在相变过程中羰基与苯环的共平面作用逐渐被打破,且在相变点苯环间的二面角明显增大.

Temperature-denpendent FTIR Spectroscopy Phase Transition Process of Thin Films of Antiferroelectric Liquid Crystal

The conformation and orientation of the alkyl chain and the core of AFLC were studied by temperature-dependence spectroscopy. The conformation and orientation of the alkyl chain changed obviously as the temperature increased except the phase transition point between the S~*_(IA) and S~*_(CA). Three CO stretching vibrational modes gave two different phase transition behavior. The phase transition between increasing and decreasing temperature was quite different, this is due to the influence of substrate.