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Evaluation of charging characteristics of polymeric powders by thermally stimulated current spectroscopy

热激电流谱评价聚合物粉末的充电特性

基本信息

批准号：
11650058
负责人：
IKEZAKI Kazuo
金额：
$ 2.3万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

We proposed a method for correcting the open-TSC error induced by thermal change in thickness of sample powder layers during TSC measurement. For application of this proposed method to polymeric powders we developed an equipment for measuring the thickness change of sample powder compactions. Two kinds of sample container were also developed in response to the characteristics of sample powders. The proposed correcting-method of TSC of powder-formed polymers was applied to the following 3 systems, using a newly developed sample molding technique and above-mentioned containers of powder samples:(1) From the results of TSC spectra of powder paints stored at high temperatures, it was confirmed that lowering in charge stability of these powder paints appeared before blocking generation of the powders. It was also shown that progress in cure reaction of powder paints could be evaluated by TSC method.(2) Electrical characteristics and crystalline structure of a quaternary ammonium salt charge … More control additive were examined. As a result, irreversible transition of the crystalline structure and remarkable increase in the electrical conductivity of the additive was observed when it was heat-treated at temperatures higher than 162 ℃. TSC spectra of a pseudo-toner containing this charge control additive showed that the additive was more effective to contact and triboelectrification than corona electrification. Triboelectrification between toner and carrier was also studied using a newly developed carrier dropping method" which can be used under two different conditions: electrically isolated and unisolated conditions. It was also found that the proposed method was useful for examining the mechanism of functional recovery in charging sites of carriers.(3) TSC spectra of cryogenically pulverized polypropylene powders have one broad TSC band peaked around 110℃ in a temperature range above room temperature, unlike the case of film samples of polypropylene This broad TSC band was assigned to a band relating with crystalline defects introduced during pulverization. An irreversible crystalline structural change (α_1 to α_2) was also observed for polypropylene powders heat-treated above 150℃. Less

提出了一种修正TSC测量过程中样品粉末层厚度热变化引起的开TSC误差的方法。为了将所提出的方法应用于聚合物粉末，我们开发了一种用于测量样品粉末压制的厚度变化的设备。针对样品粉末的特点，研制了两种样品容器。采用新开发的样品成型技术和上述粉末样品容器，将所提出的粉末成型聚合物的TSC校正方法应用于以下3个体系：（1）从粉末涂料在高温下储存的TSC谱的结果，证实了这些粉末涂料的电荷稳定性的降低出现在粉末的阻塞产生之前。试验还表明，用热激电流法可以评价粉末涂料的固化反应进程。(2)一种季铵盐电荷的电学特性和晶体结构 ...更多信息检查对照添加剂。结果表明，当热处理温度高于162 ℃时，添加剂的晶体结构发生不可逆转变，电导率显著提高。含有该电荷控制添加剂的伪调色剂的TSC光谱表明，该添加剂对接触和摩擦起电比电晕起电更有效。采用一种新开发的"载体滴落法“研究了墨粉和载体之间的摩擦带电，该方法可用于两种不同的条件：电隔离和非隔离条件。有人还发现，所提出的方法是有用的，用于检查在充电网站的载体的功能恢复的机制。(3)低温粉碎聚丙烯粉末的TSC谱在室温以上的温度范围内有一个宽的TSC带，峰值在110℃附近，这与聚丙烯薄膜样品的情况不同。在150℃以上热处理的聚丙烯粉料中，还观察到不可逆的结晶结构变化（α_1 → α_2）。少