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Structure and Relaxation of Cellulose Derivatives

纤维素衍生物的结构和松弛

基本信息

批准号：
63560163
负责人：
HIRAI Nobuyuki
金额：
$ 1.34万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63560163/
关键词：
Relaxation of Cellulose Derivatives Piezoelectric Materials Cellulose Derivatives With Fluorine Crystalline Dispersion of Cellulose Crystalline Structure and NMR Spectrum セルロ-ス誘導体の緩和セルロース誘導体圧電緩和誘電緩和

项目摘要

The purpose of this research is to obtain new cellulose derivatives with high piezoelectric constants and investigate the elastic, dielectric and piezoelectric relaxations. The piezoelectric properties of cyanoethyl cellulose have been investigated. New cellulose derivatives with fluorine were synthesized. The piezoelectricity of them was investigated. The degree of crystallinity and orientation of the cellulose derivatives were very low. And so the piezoelectric constants of them were very low compared with that of cyanoethyl cellulose which was of the order of 10^<-13> C/N. But it may be considered that there is a possibility of development of high piezoelectric materials from cellulose derivatives by high orientation and crystallization of them. The relaxation behaviors of cellulose derivatives are investigated. Dispersions due to side chain in cellulose derivatives are studied about cellulose acetate, cellulose tosylate, cyanoethyl cellulose, PDAF-cyanoethyl cellulose, and PDAF-ethyl cellulose. There was a difference between cellulose triacetate and cellulose diacetate in local mode of side chain. There was observed the piezoelectric, dielectric and elastic temperature dispersions at about -30ﾟC in cellulose triacetate due to acetyl group, and at about -80ﾟC in cellulose diacetate due to methylol group. There were observed the primary dispersions of the piezoelectric, dielectric and elastic moduli in ethyl cellulose and cellulose acetate, at about 55ﾟC in ethyl cellulose, at about 100ﾟC in cellulose triacetate, and above 100ﾟC in cellulose diacetate. Because the cellulose derivatives were very low at the degree of crystallinity and orientation, we could not measure the temperature dependency of them. The temperature dependency of cellulose crystals was measured. There was an abrupt thermal expansion perpendicular to molecular chain in cellulose crystals above 200ﾟC. It may be considered that there is the temperature dispersion in cellulose crystals.

本研究的目的是获得具有高压电常数的新型纤维素衍生物，并研究其弹性、介电和压电弛豫。研究了氰乙基纤维素的压电特性。合成了新的含氟纤维素衍生物。研究了它们的压电性。纤维素衍生物的结晶度和取向度非常低。因此，与氰乙基纤维素相比，它们的压电常数非常低，为10^-13C/N量级。但可以认为，通过纤维素衍生物的高取向和结晶化，有可能开发出压电材料。研究了纤维素衍生物的松弛行为。研究了乙酸纤维素、甲苯磺酸纤维素、氰乙基纤维素、PDAF-氰乙基纤维素和PDAF-乙基纤维素由于纤维素衍生物中的侧链引起的分散。三醋酸纤维素和二醋酸纤维素在侧链的局部模式上存在差异。由于乙酰基，在三醋酸纤维素中观察到约-30°C的压电、介电和弹性温度色散，由于羟甲基，在二醋酸纤维素中观察到约-80°C的压电、介电和弹性温度色散。在乙基纤维素和醋酸纤维素中观察到压电模量、介电模量和弹性模量的初级色散，乙基纤维素在约55℃，三醋酸纤维素在约100℃，二醋酸纤维素在100℃以上。由于纤维素衍生物的结晶度和取向度非常低，因此我们无法测量它们的温度依赖性。测量纤维素晶体的温度依赖性。纤维素晶体在200℃以上会出现垂直于分子链的突然热膨胀。可以认为纤维素晶体中存在温度分散。