Fundamental Studies on Functionalization of Cellulosics by Control of Their Molecular Assemblies

通过控制其分子组装进行纤维素功能化的基础研究

• 批准号: 01490011
• 负责人: MIYAMOTO Takeaki
• 金额: $ 4.42万
• 依托单位: Ktoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01490011/
• 关键词: Cellulose; Cello-oligosaccharides; Cholesteric; Columnar liquid crystal; LB films; Polymer reactions; Fine structure; fluorescence spectroscopy; カラムナ-液晶; セルロ-ス誘導体; セロビオ-ス; 水面単分子膜

This research project concerns the fundamental studies on the formation of organized molecular assemblies by cellulose derivatives, especially on the formation of liquid crystals and Langmuir-Blodgett(LB) films. To this end, we have prepared various types of novel cellulose derivatives by utilizing conventional polymer reactions. The results revealed that(1) cellulose ether derivatives having a flexible substituent of appropriate length can form a cholesteric mesophase and undergo a thermally induced inversion of helicoidal sense at a characteristic temperature, depending on the length of flexible substituent and main chain.(2) The ester derivatives such as cellulose triacylates do not form a cholesteric mesophase but a new type of columnar liquid crystal.(3) Cello-oligosaccharides including cellobiose are very interesting mesogens.As to LB films, different types of amphiphilic ester and ether derivatives were prepared from cellulose and cellulose derivatives and the fine structure of mono- and multi-layer films was examined by electron microscopy and fluorescence spectroscopy. It was found that completely homogeneous mono- and multiーlayer films are formed with esters derived from cellulose, while other derivatives including tri-O-alkyl celluloses cannot form a homogeneous monoーlayer.The results were discussed from a viewpoint of novel functionalization of cellulosics.

本研究项目涉及纤维素衍生物形成有序分子组装的基础研究，特别是液晶和Langmuir-Blodgett(LB)膜的形成。为此，我们利用传统的聚合物反应制备了各种类型的新型纤维素衍生物。结果表明：(1)具有适当长度柔性取代基的纤维素醚衍生物可以形成胆甾型中间相，并在一定的特征温度下发生螺旋状的热致反转，这取决于柔性取代基和主链的长度。(2)纤维素三酯类衍生物不形成胆甾型中间相，而是一种新型的柱状液晶。(3)包括纤维二糖在内的纤维素低聚糖是一种非常有趣的介晶。研究发现，由纤维素衍生的酯可以形成完全均一的单层和多层ー膜，而包括三-O-烷基纤维素在内的其他衍生物不能形成均一的单ー层。

项目成果

T. Miyamoto et al.: "Preparation and Monolayer Films of Cellobiose Alkyl Esters" Bull. Inst. Chem. Res., Kyoto Univ.68. 53-62 (1990)

T. Miyamoto 等人：“纤维二糖烷基酯的制备和单层薄膜”公牛。

T.Miyamoto,et al.: "Effects of Chain Length and Its Distribution on Thermotropic Mesophase Structure of TriーOーheptyl Cellulose" Cell.Chem.technol.

T. Miyamoto 等人：“链长及其分布对三邻庚基纤维素热致中间相结构的影响”Cell.Chem.technol。

T.Miyamotoetal.: "PreparationandMonolayerFilmsofCellobioseAlkylEsters" Bull.Inst.Chem.Res.,KyotoUniv.68. 53-62 (1990)

T.Miyamoto等人：“纤维二糖烷基酯的制备和单层薄膜”Bull.Inst.Chem.Res.，KyotoUniv.68。

T. Miyamoto et al.: Ellis Horwood Pub."Cellulose : Structural and Functional Aspects, (1990)

T. Miyamoto 等人：Ellis Horwood Pub.“纤维素：结构和功能方面，(1990)

T.Miyamoto,et al.: "Dynamic Viscoelasticity of Thermotropic Liquid Crystalline Cellulose Derivatives" Nihon Reoroji Gakkaishi. 18. 27-32 (1990)

T.Miyamoto 等：“热致液晶纤维素衍生物的动态粘弹性”Nihon Reoroji Gakkaishi。