作　　者： ; ;

机构地区： 惠州学院电子科学系物理系

出　　处： 《湖北大学学报（自然科学版）》 2002年第4期315-318,共4页

摘　　要： 传统的热刺激电流技术包含速冷极化过程.而基于"温度窗口"的热刺激电流技术因考虑速冷极化过程涉及复杂的温度变化和时间弛豫过程,排除了这一过程.因速冷极化过程可能含有各种材料的结构和温度变化信息,故专门对此过程作了初步的实验和理论研究.实验样品为聚丙烯,从40℃分别速冷至0℃和液氮温度.理论上主要从两个方面进行了分析:其一,分析了温度梯度与电荷运动的关系;其二,分析了温度突变导致的结构弛豫的原理及其非平衡电荷积累产生的衰减过程.提出了用虚温度TS表示结构弛豫的过程.得到了弛豫函数(t)∝[1-exp(-t τ1)]atxexp[-(t τ2)b].此公式与实验结果符合得较好. The traditional thermally stimulated current(TSC) includes quenching polarization process. But the recently developed 'thermal windowing' technique of TSC avoids this process by considering complicated temperature change and the time relaxation process in the measurement. As the probability of the information of structure and temperature variations is existed in the process, the quenching polarization process has been investigated in experiment and theory. The experiment data, polarization from 40?℃ to 0?℃ and liquid N2 respectively, show an abnormally charging phenomenon in polypropylene. The results are analyzed in terms of the relationship of temperature grads with charge movement, the principles of structural relaxation due to the configuration influenced by temperature and the decay of the accumulated non-equilibrium charges. A fictitious temperature, TS,is introduced to express the process of structural relaxation. The obtained relaxation function(t)∝atxexp,has a good agreement with the experimental results.

关 键 词： 聚合物 速冷极化过程 弛豫机理 介电弛豫 温度梯度 热刺激电流技术

领　　域： [理学] [理学]