Study of Polymer Dynamics by Nonlinear Dielectric Relaxation Spectroscopy

非线性介电弛豫谱研究聚合物动力学

基本信息

批准号：
61460073
负责人：
HAYAKAWA Reinosuke
金额：
$ 3.52万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

in this study, nonlinear dieletric relaxation spectrometers in both the time and frequency domains were developed and applied to polymers with special functions. A summary of the study is as follows:1. A high-speed, high-voltage rectangular electric field generator and a circuit for detection of electric displacement were fabricated. By combining these equipments with a digital storage oscilloscope and a personal computer, we developed the time-domain nonlinear spectrometer for observing the acceleration of the rise response thme by a high electric field.2. Using a synthesizer, a high-volatge amplifier, the digital storage oscilloscope and the personal computer, we developed the frequency-domain nonlinear spectrometer for detecting the magnitudes and the phase retardations of the fundamental and the harmonics contained in the dielectric response.3. By use of the above spectrometers, we measured the nonlinear dielectric relaxation spectrum of the copolymer of vinylidene fluoride and trifluoro ethylene (ferroelectric, piezoelectric polymer) and the nonlinear conductivity spectrum of polythiophene (conducting polymer). The nonlinear dielectric relaxation spectrum of the copolymer observed in the temperature range around the Curie point gave information on local dipolar interactions important for the appearance of ferroelectricity, Further, by measuring the nonlinear conductivity spectrum of polythiophene in a wide temperature range from liquid nitrogen temperature to the room temperature, we obtained a new information on the conduction mechanism in conducting polymers.

在这项研究中，开发了时域和频域的非线性介电弛豫光谱仪，并将其应用于具有特殊功能的聚合物。研究内容如下： 1．制作了高速高压矩形电场发生器和电位移检测电路。将这些设备与数字存储示波器和个人计算机相结合，开发了时域非线性谱仪，用于观测强电场下上升响应时间的加速。 2．利用合成器、高压放大器、数字存储示波器和个人计算机，研制了频域非线性谱仪，用于检测介电响应中基波和谐波的幅值和相位延迟。 3．利用上述光谱仪，我们测量了偏二氟乙烯和三氟乙烯共聚物（铁电、压电聚合物）的非线性介电弛豫谱和聚噻吩（导电聚合物）的非线性电导谱。在居里点附近的温度范围内观察到的共聚物的非线性介电弛豫谱提供了对于铁电性的出现很重要的局部偶极相互作用的信息。此外，通过测量聚噻吩在从液氮温度到在室温下，我们获得了有关导电聚合物导电机制的新信息。