权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Electromechanical properties of cellulose derivatives with electrical function

具有电功能的纤维素衍生物的机电性能

基本信息

批准号：
12660147
负责人：
HIRAI Nobuyuki
金额：
$ 2.3万
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：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The purpose of the present investigation is to develop electrically functional and environmentally friendly materials from cellulose derivatives. The electrical and mechanical properties of cyanoethylated hydroxyethyl-cellulose (CEHEC) were investigated. The results obtained were summarized as follows.1) Relationship between degree of substitution and values of the dielectric constants was investigated. With increase of degree of substitution by cyano group, the values of the dielectric constants of CEHEC increased.2) The electromechanical coupling factors for CEHEC were calculated from the resonance curve of vibrating reed method in the cases of short-circuit (st) and open-circuit (op). Open-circuited measurement gives the elastic constant corresponding to zero elastic displacement, while short-circuited one gives the constant to zero electric field. Resonance curves were measured at dry condition and 40%RH. Values of Elasticity ratio, Eop/Est were almost larger than 1. Values of elas … More tic loss factor (tan δ) at short-circuit were almost larger than those of the elastic loss factor at open-circuit. But relationship between values of Eop/Est and the piezoelectric constants was not clear. Resonance frequency decreased with increasing continuous measurements, because of temperature rise in the measuring chamber by the temperature rise of the electric driver. Values of resonance frequency at continuous measurements and discontinuous measurements were almost same at each temperature. The electromechanical coupling factor (K) was calculated from the values of piezoelectric, dielectric and elastic constants at dried condition and the electromechanical coupling factor (K_E) was calculated from both elastic constants, Eop and Est. The values of K_E were larger than those of K.3) Pyroelectric substance behaves piezoelectric effect. As CEHEC behaves as piezoelectric substance, CEHEC is expected to be pyroelectric. Pyroelectricity of CEHEC films was showed without applying high voltage poling treatment. Electrical charge produced by pyroelectric effect was observed at high temperature region. It is necessary that we measure pyroelectric behavior about specimens applied high voltage.4) The films of which DS were different were buried in soil. All films were gradually decomposed with increasing treated time in the soil, and resonance frequency of vibrating reed method decreased. The firms with the lowest DS decomposed most rapidly. It is recognized that biodegradation takes place easily with decrease of degree of substitution of cyano group and CEHEC film can be degraded by microorganisms in soil. Less

本研究的目的是利用纤维素衍生物开发电功能且环保的材料。研究了氰乙基化羟乙基纤维素（CEHEC）的电气和机械性能。所得结果总结如下：1)研究了取代度与介电常数值之间的关系。随着氰基取代度的增加,CEHEC的介电常数值增大。2)根据振动簧片法在短路(st)和开路(op)情况下的谐振曲线计算CEHEC的机电耦合系数。开路测量给出与零弹性位移相对应的弹性常数，而短路测量给出与零电场相对应的常数。共振曲线是在干燥条件和 40%RH 下测量的。弹性比Eop/Est的值几乎大于1。短路时的弹性损耗因子(tanδ)的值几乎大于开路时的弹性损耗因子的值。但Eop/Est值与压电常数之间的关系尚不清楚。由于电驱动器的温度升高导致测量室的温度升高，因此随着连续测量的增加，共振频率降低。连续测量和不连续测量时的共振频率值在各温度下几乎相同。机电耦合系数 (K) 由干燥条件下的压电常数、介电常数和弹性常数的值计算得出，机电耦合系数 (K_E) 由弹性常数 Eop 和 Est 计算得出。 K_E的值比K的值大。3)热释电物质表现出压电效应。由于 CEHEC 表现为压电物质，因此 CEHEC 预计是热释电的。 CEHEC 薄膜在未进行高压极化处理的情况下也显示出热电性。在高温区域观察到热释电效应产生的电荷。有必要测量施加高电压的样品的热释电行为。4)将不同DS的薄膜埋在土壤中。随着处理时间的延长，所有薄膜均逐渐分解，振动簧片法的共振频率降低。 DS 最低的公司分解得最快。人们认识到，随着氰基取代度的降低，容易发生生物降解，并且CEHEC膜可以被土壤中的微生物降解。较少的