Influence of molecular orientation on polarization phenomena in polyethylene terephthalate films

[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials Pub Date : 1991-07-08 DOI:10.1109/14.142708

A. Bernès, D. Chatain, C. Lacabanne

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引用次数: 12

Abstract

The influence of uniaxial and biaxial orientation on polarization phenomena of polyethylene terephthalate (PET) films has been investigated. Thermally stimulated current (TSC) spectroscopy has been applied to the study of the kinetics of polarization phenomena in unoriented and in uniaxially and biaxially oriented PET films. Around 50 degrees C, a relaxation mode that seems to be a precursor of the glass transition is observed. This sub-T/sub g/ mode has been attributed to free volume diffusion. Around the glass transition temperature (T/sub g/) a relaxation mode is observed in all samples: in unoriented PET, it is located at 82 degrees C, while in uniaxially oriented PET, is is shifted to 85 degrees C, and in biaxially oriented PET, it reaches 100 degrees C. These complex relaxation modes have been analyzed by using the technique of fractional polarizations, and the kinetics of the elementary depolarizations has been characterized by activation enthalpies and entropies. Around the crystallization temperature, a spontaneous TSC peak due to pyrocurrent is observed in unoriented and uniaxially oriented PET. It has been associated with the dielectric manifestation of the crystallization.<>

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分子取向对聚对苯二甲酸乙二醇酯薄膜极化现象的影响

研究了单轴和双轴取向对聚对苯二甲酸乙二醇酯(PET)薄膜极化现象的影响。热刺激电流(TSC)光谱已被应用于研究无取向、单轴和双轴取向PET薄膜的极化现象动力学。在50℃左右，可以观察到一种松弛模式，它似乎是玻璃化转变的前兆。这种次t /次g/模式归因于自由体积扩散。在玻璃化转变温度(T/sub g/)附近，所有样品都观察到一个弛豫模式:在无取向PET中，它位于82℃，在单轴取向PET中，它位于85℃，在双轴取向PET中，它达到100℃。利用分数极化技术分析了这些复杂的弛豫模式，并通过激活焓和熵表征了基本脱极化的动力学。在结晶温度附近，在无取向和单轴取向的PET中观察到一个自发的TSC峰。它与结晶的介电表现有关。

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[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials

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