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Study on Synthesis and Characterization of Ferroelectric Side Chain Liquid Crystalline Polymers

铁电侧链液晶聚合物的合成与表征研究

基本信息

批准号：
03650732
负责人：
IIMURA Kazuyoshi
金额：
$ 1.15万
依托单位：
Science University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650732/
关键词：
Ferroelectric Side Chain Liquid Crystalline Polymer Chiral Smectic C Phase Smectic C Phase Orientational Structure Tilt Angle 強誘電性側鎖型高分子液晶カイラルスメクティックC^*相光学活性基

项目摘要

1) Various liquid crystalline polymethacrylates with terminal chains were schematically synthesized, and effects of terminal chain lengths for their phase transitions and smectic layer structures were examined.In the liquid crystalline polymethacrylates (SCLCPMs) having terminal alkoxy chains in the mesogenic pendant group, SCLCPMs form smectic C phases with polytype layer structures when the length (m) of the terminal alkoxy group is longer than butoxy group (m=4). In SCLCPMs having the terminal chains of m=4, 5, and 6, tilt angles are 60-62ﾟ, and in the case of m=7 and 8, the tilt angle is 50ﾟ. however, Chiral SCLCPM having s-(-)-2-methylbutoxy terminal group (corresponding to the length of m=4) forms a tilted monolayer structure with the tilt angle of 42ﾟ in a chiral smectic C^* phase.These results conclude that the layer structure and tilt angle can be con-trolled through the length and structure of the terminal chain.2) Novel ferroelectric side chain liquid crystalline polymers were prepared and their spontaneous polarizations were examined.A chiral liquid crystalline polytartrate which have chiral groups in a polymer backbone forms a chiral smectic C^* phase and has a large spontaneous polarization (PS) of 5 mc/m^2. A chiral liquid crystalline polymethacrylate having a chiral group in a spacer unit also exhibit a chiral smectic C^* phase with Ps of 1.2 mC/m^2A chiral group can be also introduced in the polymer skeleton through copolymerization. A chiral liquid crystalline copolymethacrylate prepared by copolymerization of chiral nonmesomorphic and achiral mesogenic methacrylates forms a chiral smectic C^* phase.

1)合成了各种端链型液晶聚甲基丙烯酸酯（SCLCPMs），考察了端链长度对其相变和近晶层结构的影响.在端链烷氧基侧基的液晶聚甲基丙烯酸酯（SCLCPMs）中，当末端烷氧基的长度（m）大于丁氧基（m=4）时，SCLCPMs形成具有多型层状结构的近晶C相。在具有m=4、5和6的末端链的SCLCPM中，倾斜角为60-62 °，并且在m=7和8的情况下，倾斜角为50 °。但是，在此情况下，具有s-（-）-2-甲基丁氧基端基的手性SCLCPM（对应于m=4的长度）在手性近晶C^* 相中形成倾斜的单层结构，倾斜角为42 °，表明可以通过末端链的长度和结构来控制层结构和倾斜角。合成了一种新型的铁电性侧链液晶聚合物，并对其自发极化进行了研究.聚合物主链上含有手性基团的手性液晶聚酒石酸酯形成了手性近晶C^* 相，并具有5 mc/m^2的大自发极化（PS）。在间隔单元中具有手性基团的手性液晶聚甲基丙烯酸酯也表现出手性近晶C^* 相，Ps为1.2 mC/m^2。也可以通过共聚将手性基团引入聚合物骨架中。通过手性非介晶甲基丙烯酸酯和非手性介晶甲基丙烯酸酯的共聚制备的手性液晶共聚甲基丙烯酸酯形成手性近晶C^* 相。