Carbon-13 NMR Study of Liquid Crystals

本研究是物理化学实验的一部分， 计划，将使用碳-13核磁共振研究取向排序 的液晶。 使用的方法包括去除 质子-质子耦合，快速样品旋转附近的 魔角和碳-质子耦合还原，耦合 利用傅里叶变换技术来解析峰值 不同的碳原子。 将研究几个系统， 该方法包括在介晶中引入液晶， 核心 侧链上取代基的影响 铁电液晶将与它们的 自发极化 侧链的取向有序化 含聚丙烯酸酯和聚硅氧烷的液晶聚合物 骨干将接受调查。 链序计算 基于分子场理论， 实验结果。

This research, part of the Physical Chemistry Experimental Program, will use carbon-13 NMR to study orientational ordering of liquid crystals. The method to be used involves the removal of proton-proton couplings, rapid sample spinning near the magic angle and reduction of carbon-proton couplings, coupled with the use of Fourier transform techniques to resolve peaks of different carbon atoms. Several systems will be studied by this method including nematic liquid crystals in the mesogenic core. The effects of substituents in the side chain of ferroelectric liquid crystals will be correlated with their spontaneous polarization. Orientational ordering of side chain liquid crystal polymers with polyacrylate and polysiloxane backbones will be investigated. Chain ordering calculations based upon molecular field theory will be performed to analyze the experimental results.