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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >The use of the final thermally stimulated discharge current technique to study the molecular movements around glass transition
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The use of the final thermally stimulated discharge current technique to study the molecular movements around glass transition

机译：使用最终的热刺激式放电电流技术来研究玻璃过渡周围的分子运动

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During electric polarization charge is injected into the material. The structure is decorated with space charge and during the subsequent heating an apparent peak and the genuine peaks that are related to dipole randomization and charge detrapping are observed. The method is used here to analyze the molecular movements in polyimide in the temperature range from 293 to 623 K. Two weak relaxations have been observed around 337 K and around 402 K. The electrical conductivity changes with temperature in agreement with the Arrhenius law only below (W = (0.84 ± 0.03) eV) and above (W = (0.82 ± 0.03) eV) the temperature range where the β relaxation is observed. The variation of the electrical conductivity with temperature, in the range of the β relaxation, is controlled by the variation of the charge currier mobility with temperature and it shows a non-Arrhenius behavior. We suggest that the β_1 sub-glass relaxation is related to the rotation or oscillation of phenyl groups and the β_2 sub-glass relaxation is related to the rotation or oscillation of the imidic ring. At higher temperatures an apparent peak was observed. The relaxation time of the trapped charge, at 573 K, is high than 8895 s.
机译：在电极化电荷期间注入材料中。该结构装饰有空间电荷，并且在随后的加热过程中，观察到与偶极随机化和电荷脱裂有关的正版峰值。这里使用该方法以分析293至623k的温度范围内的聚酰亚胺中的分子运动。已经观察到左右337 k和约402k左右的两个弱弛豫。电导率随温度的变化，同意仅与Arrhenius法律相一致（W =（0.84±0.03）EV）及以上（W =（0.82±0.03）EV）观察β松弛的温度范围。在β松弛范围内，温度与温度的电导率的变化由电荷竞争迁移率的变化控制，并且它显示出非arrenius行为。我们建议β_1副玻璃弛豫与苯基的旋转或振荡有关，β_2副玻璃弛豫与模型环的旋转或振荡有关。在更高的温度下，观察到表观峰。捕获电荷的放松时间在573 k，高于8895秒。

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