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Structure and Properties of Cellulose Derivatives with Piezoelectricity, Pyroelectricity and Ferroelectricity

压电、热电、铁电纤维素衍生物的结构与性能

基本信息

批准号：
07660214
负责人：
HIRAI Nobuyuki
金额：
$ 1.41万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

The purpose of the present investigation is to develop electrically functional materials of cellulose derivatives. High piezoelectricity and also the possibility of ferroelectricity of cellulose derivatives have been studied, It is recognized that cyanoethylated cellulose has the highest piezoelectric modulus in the cellulose derivatives. The results obtained are sumarized as follows.1. High piezoelectric modulus and electromechanical coupling factor of cyanoethylated hydroxyethylcelluloseThe piezoelecric moduli of cellulose nitrate. cellulose acetate, cyanoethylated cellulose and cyanoethylated hydoroxyethylcellulose have been measured. The value of cyanoethylated hydroxyethylcellulose is about 1-2*10^<-11> C/N at 20ﾟC.The value of it is the highest in the cellulose derivatives and is almost the same to the value of Polyvinyl fluoride. It may be possible to use it as indusyrial materials with electric functions. Electromechanical coupling factor K is considered as an important figure of merit in estimating the properties of the piezoelectric materials. There is a linear relationship between piezoelectric constant and electromechanical coupling factor. Compared with the K value of the polyvinylidene fluoride. that of cyanoetylated hydroxyethylcellulose is very small and under 4%.2. Possibility of ferroelectric cellulose derivativesWe could not prove the existence of ferroelectricity in cyanoethylated hydoroxyethyl-cellulose and benzyl cellulose experimentally. Measurements of ferroelecricity of cellulose derivatives oriented by high electric field or high magnetic field are now under consideration. And pyroelectricity of cyanoethylated hydroxyethylcellulose was examined. But we could not recognized the pyroelectricity of cyanoethylated hydroxyethyl-cellulose. though we can observed the pyroelectricity of P (VDF/TrFE).

本研究的目的是开发纤维素衍生物的电功能材料。研究了纤维素衍生物的高压电性和铁电性的可能性，认为在纤维素衍生物中，氰乙基化纤维素具有最高的压电模量。所得结果总结如下：1。氰乙基化羟乙基纤维素的高压电模量和机电耦合系数硝酸纤维素的压电模量。测定了醋酸纤维素、氰乙基化纤维素和氰乙基化氢氧乙基纤维素。在20ºC时，氰乙基羟乙基纤维素的值约为1-2*10^<-11> C/N。它的价值是纤维素衍生物中最高的，与聚乙烯醇的价值几乎相同。它有可能用作具有电气功能的工业材料。机电耦合系数K是评价压电材料性能的重要指标。压电常数与机电耦合系数之间存在线性关系。与聚偏氟乙烯的K值进行了比较。氰乙基化羟乙基纤维素的纤维素含量很少，在4%以下。铁电性纤维素衍生物的可能性氰乙基化羟氧乙基纤维素和苄基纤维素的铁电性尚不能通过实验证明。高电场或强磁场取向下纤维素衍生物铁电性的测定是目前研究的课题。并测定了氰乙基羟乙基纤维素的热电性。但是我们不能识别氰乙基化羟乙基纤维素的热电性。虽然我们可以观察到P （VDF/TrFE）的热电性。