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Study on Control of Liquid Crystal formation for Optically Anisotropic Films Synthesized from Chitin

甲壳素合成光学各向异性薄膜液晶形成控制研究

基本信息

批准号：
16380219
负责人：
TAKEMURA Akio
金额：
$ 10.05万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16380219/
关键词：
Chitin Liquid Crystalline Optically Anisotropic 2D FT-IR Hydrogen bonding

项目摘要

From the previous our study, the following knowledge was obtained that microcrystalline chitin (MC), which is moderately hydrolyzed in aqueous hydrochloric acid, has NH3+ and shows chiral-nematic liquid crystalline structure in both aqueous suspension and including acrylic acid monomer, where isotropic, anisotropic and birefringence phases are found. The orientation was induced by placing in magnetic field or applying shear strength. The composite polymers made from the orientated suspension still had an orientation. From the polarized FT- IR analysis, glucose ring was orientating 90°, amide and NH groups were orientating 0° against magnetic field direction. When orientated by shear strength, glucose ring was orientating 0°, amide and NH groups were orientating 90° against shear direction, which was totally opposite when applying magnetic field.The present study is focusing on controlling LC formation of the above synthesized composite. In the course of studying 2D FT-IR of composite, it is known that the chitin structure is changing with the increase of temperature. The 2D FT-IR spectrum of orientated LC film was investigated. We can observe the state of hydrogen bonding(HB) and the sequence of breaking HB occurred in the order of [O(6)H... O(6)] of intermolecular hydrogen bonding, and [O(6')H...O(7)], [O(3')H...O(5)] of intramolecular HB with the increase of temperature. These results corresponds with X ray diffraction analysis.The structure of β chitin is similarly analyzed. It can be assigned that 3515 and 3376cm-1 are derived intermolecular HB of C(6)OH, 3342cm-1 the intramolecular HB of C(3)OH, 3617 and 1567cm-1 are due to free C(3)OH and C(6)OH, respectively.

从之前的研究中，我们得到以下认识：在盐酸水溶液中适度水解的微晶甲壳素（MC）具有NH3+，并且在水悬浮液和包括丙烯酸单体中均显示出手性向列液晶结构，其中发现了各向同性、各向异性和双折射相。通过放置在磁场中或施加剪切强度来诱导取向。由取向悬浮液制成的复合聚合物仍然具有取向。根据偏振 FT-IR 分析，葡萄糖环与磁场方向成 90° 取向，酰胺和 NH 基团与磁场方向成 0° 取向。当通过剪切强度取向时，葡萄糖环取向为0°，酰胺和NH基团相对于剪切方向取向为90°，这与施加磁场时完全相反。本研究的重点是控制上述合成复合材料的LC形成。在研究复合材料的2D FT-IR过程中，发现甲壳素结构随着温度的升高而发生变化。研究了取向液晶薄膜的二维傅立叶变换红外光谱。可以观察到随着温度的升高，氢键(HB)的状态以及HB断裂的顺序按照分子间氢键的[O(6)H...O(6)]，分子内氢键的[O(6')H...O(7)]、[O(3')H...O(5)]的顺序发生。这些结果与X射线衍射分析相符。β甲壳素的结构也进行了类似的分析。可以认为，3515和3376cm-1是C(6)OH的分子间HB，3342cm-1是C(3)OH的分子内HB，3617和1567cm-1分别是游离的C(3)OH和C(6)OH。