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Basic research on development of cellulose derivatives as highly functional materials.

纤维素衍生物作为高功能材料开发的基础研究。

基本信息

批准号：
02660170
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：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

In this study, the cellulose derivatives which have an important characteristic were synthesized and the piezoelectricity, dielectricity and elasticity of them were investigated. Cyanoetylated cellulose and nitrocellulose were studied as the materials with high piezoelectricity. The piezoelectric modulus is the order of 10^<-12> C/N. In the cellulose derivatives the value is very high. It is possible to increase the value by drawing more than 100 %. It was proved that nitrocellulose has high value of piezoelectric modulus at high temperature. The values of the piezoelectric moduli of cellulose nitrate depend on the values of the degrees of substitution. Cellulose trinitrate has higher. value of piezoelectric modulus than cellulose dinitrate. At high temperature region, it has the piezoelectric modulus of 10^<-12> C/N which approaches the value of cyanoetylated cellulose. It may be possible to use it as industrial materials with electric functions by increasing the piezoelectric polarization. In order to get the cellulose nitrate with high piezoelectic modulus the investigation has been done. It may be considered that highly crystalline cellulose derivatives can be synthesized by decreasing degree of polimerization, for example acid hydrolysis or radiation irradiation.Studies on piezoelectricity, dielectricity and elasticity of the cellulose nitrate with electric functions have been done. It may be considered that there were different structures in the state of orientation of molecules or crystallinity in the process of heat drawing. There were observed that temperature dispersions in the piezoelectricity, dielectricity and elasticity at about -80ﾟC, -10ﾟC, 70ﾟC and 130ﾟC. While the piezoelectric modulus was small, there was not observed the dispersion at 130ﾟC and the elastic modulus decreased suddenly at temperature above 50ﾟC.

本研究合成了具有重要特性的纤维素衍生物，并对其压电性、介电性和弹性进行了研究。研究了氰乙基化纤维素和硝化纤维素作为高压电材料。压电模量为10^<-12> C/N数量级。在纤维素衍生物中价值很高。通过绘制超过100%，可以增加价值。结果表明，硝化纤维素在高温下具有较高的压电模量。硝酸纤维素的压电模量的大小取决于取代度的大小。三硝酸纤维素具有较高的。压电模量比硝酸纤维素高。在高温区，它的压电模量为10^<-12> C/N，接近氰基化纤维素的值。通过增加压电极化，使其成为具有电功能的工业材料成为可能。为了得到具有高压电模量的硝酸纤维素，进行了研究。可以认为，通过降低聚合度，例如酸水解或辐射辐照，可以合成高结晶纤维素衍生物。对具有电功能的硝酸纤维素的压电性、介电性和弹性进行了研究。可以认为在热拉伸过程中，分子的取向状态或结晶度状态存在着不同的结构。在-80、-10、70和130左右的温度下，材料的压电性、介电性和弹性均存在温度分散。虽然压电模量很小，但在130ºC时没有观察到弥散现象，而在50ºC以上时，弹性模量突然下降。