Liquid Crystallinity of Thermotropic Liquid crystal Polymers Studied by Two-Dimensional Poralized Infrared Spectroscopy and X-ray Diffraction Correlation Spectroscopy

二维偏振红外光谱和X射线衍射相关光谱研究热致液晶聚合物的液晶性

• 批准号: 14540477
• 负责人: OZAKI Yukihiro
• 金额: $ 1.79万
• 依托单位: Kwansei Gakuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540477/
• 关键词: Infrared Spectroscopy; X-ray diffraction; Liquid crystal polymers; Two-dimensional correlation spectroscopy; Thermal liquid crystals; X線回折法

Thermotropic liquid crystal polymers, R_1,R_2,R_3, and R_4, which contain a phenyl group in the main chain, have a rigid backbone and in their side chains a low molecular weight liquid crystal is incorporated. At the end of their side chains a flexible alkoxy group -O(CH_2)_5-CH_3 is attached to realize liquid crystalline states by reducing their melting points. The purpose of the present study was to explore the relation between the structure and the liquid crystallinity of the four kinds of liquid crystalline polymers, R_1,R_2,R_3,R_4 by using two-dimensional infrared spectroscopy and x-ray diffraction correlation spectroscopy.First of all, the phase transition temperatures of R_1,R_2,R_3, and R_4 were determined by measuring differential scanning calorimetry (DSC) and polarized microscopy. It was found from x-ray diffraction patterns that R_1,R_2,R_3, and R_4 are nematic liquid crystals and that not only the mesogen but also the main chain are oriented with the side chains being fitted inside the other. The orientation is not two dimensional but three dimensional. it is not simple one but complicated one. The DSC results revealed that R_1,R_2,R_3, and R_4 are not pure nematic liquid crystal but partly smetic liquid crystal. It was found from temperature-dependent infrared spectroscopic study that there are two kinds of C=O groups and conformational change around the C-O bond occurs in the side chain. An asynchronous spectrum calculated from the temperature-dependent infrared spectra of R_1,R_2,R_3, and R_4 elucidated that the side chain is oriented at higher temperature than the main chain. This result was also confirmed by the temperature-dependent x-ray diffraction measurements.

热致液晶聚合物R_1，R_2，R_3和R_4主链上含苯基，主链为刚性结构，侧链为低分子量液晶。在它们的侧链末端连接一个柔性的烷氧基-O（CH_2）_5-CH_3，通过降低它们的熔点实现液晶态。本文用二维红外光谱和X射线衍射相关光谱研究了四种液晶聚合物R_1，R_2，R_3，R_4的结构与液晶性的关系，首先测定了R_1，R_2，R_3，用差示扫描量热法（DSC）和偏光显微镜测定R_4。X-射线衍射分析表明，R_1，R_2，R_3，R_4均为双相液晶，不仅液晶基元而且主链都是侧链相互嵌配的取向。定向不是二维的而是三维的。这不是简单的问题，而是复杂的问题。DSC结果表明，R_1，R_2，R_3，R_4不是纯的双相液晶，而是部分的同相液晶。变温红外光谱研究发现，侧链中存在两种C=O基团，且在C-O键附近发生构象变化。由R_1，R_2，R_3，R_4的变温红外光谱计算得到的非同步谱图说明侧链的取向温度高于主链。这一结果也得到了与温度相关的X射线衍射测量的证实。

项目成果

Dynamics a Ferroelectric Liquid Crystal with a Naphthalene Ring during Electric-Field Induced Switching Studied by Time-Resolved Infrared Spectroscopy Combined with Two-Dimensional Correlation

时间分辨红外光谱结合二维相关研究电场感应切换期间具有萘环的铁电液晶的动力学

• 发表时间: 2005
• 期刊: Asian Chemistry Letters (printing)
• 作者: J.Zhao;Y.Ozaki
• 通讯作者: Y.Ozaki

J.G.Zhao, J.H.Jiang, T.Yoshihara, H.W.Siesler, Y.Oxaki: "Dynamics a Ferroelectric Liquid Crystal with a Naphthalene Ring during Electric-Field-Induced Switching Studied by Time-Resolved Infrared Spectroscopy Combined with Two-Dimensional Correlation"Appli

J.G.Zhao、J.H.Jiang、T.Yoshihara、H.W.Siesler、Y.Oxaki：“通过时间分辨红外光谱结合二维相关研究电场感应切换期间具有萘环的铁电液晶的动力学”应用

Dynamics of a Ferroelectric Liquid Crystal during Electric-Field-Induced Switching Studied by Time-Resolved Infrared Spectroscopy Combined with Normalized Sample-Sample Two-Dimensional Correlation Spectroscopy

时间分辨红外光谱结合归一化样本-样本二维相关光谱研究铁电液晶电场诱导切换过程中的动力学

• 发表时间: 2005
• 期刊: Asian Chemistry Letters (発表予定)
• 作者: J.Zhao;Y.Ozaki
• 通讯作者: Y.Ozaki

Harumi, Sato, S.Sasao, K.Matsukawa, Y.Kito, T.Ikeda, H.Tashiro, Y.Ozaki: "Raman Mapping Study of Compatibilized and Uncompatibilized Polymer Blends of Nylon 12 and Polyethy lene"Appl. Spectrosc.. 56. 1038-1043 (2002)

Harumi、Sato、S.Sasao、K.Matsukawa、Y.Kito、T.Ikeda、H.Tashiro、Y.Ozaki：“尼龙 12 和聚乙烯的相容性和不相容性聚合物共混物的拉曼图谱研究”Appl。

An Infrared Study of Langmuir-Blodgett Films of Side-Chain Chiral Liquid Crystalline Polysiloxane

侧链手性液晶聚硅氧烷Langmuir-Blodgett薄膜的红外研究

• 发表时间: 2005
• 期刊: Langmuir (発表予定)
• 作者: X.Wang;L.Sun;B.Zhao;W.Xu;Q.Xue;K.Yang;Q.Zhang;Y.Ozaki
• 通讯作者: Y.Ozaki