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首页> 外文期刊>Journal of Applied Polymer Science >Dielectric and optical properties of a poly(ethylene terephthalate) membrane in the temperature interval 150-400 K
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Dielectric and optical properties of a poly(ethylene terephthalate) membrane in the temperature interval 150-400 K

机译：在150-400 K的温度区间内，聚对苯二甲酸乙二酯薄膜的介电和光学性质

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摘要

In this study, the dielectric and optical properties of poly(ethylene terephthalate) (PET) membranes were examined. The dielectric measurements were carried out in the temperature interval 150-400 K and in the frequency range 20 Hz-60 kHz. We analyzed in detail the temperature dependences of the dielectric permittivity and dielectric loss (tan delta) at various test frequencies. The relaxation tan delta peak, which appeared in the temperature range 150-300 K, was identified as the secondary beta relaxation. The increase in tan delta at temperatures higher than 300 K could be explained as approaching the alpha relaxation. Optical measurements were performed in the UV-visible region from 200 to 400 nm at various temperatures between 150 and 400 K. The values of the direct and indirect band gaps were calculated at various temperatures. These values were lower for higher temperatures. An absorption peak was observed at a wavelength around of 285 nm at temperatures lower than 300 K. Such insight into the dielectric and optical responses of PET track membranes in a wide temperature range is particularly important when this material is used as a matrix for the semiconductor structure in the development of optoelectronic or microfluid devices. (C) 2015 Wiley Periodicals, Inc.
机译：在这项研究中，检查了聚对苯二甲酸乙二醇酯（PET）膜的介电和光学性能。介电测量是在150-400 K的温度区间和20 Hz-60 kHz的频率范围内进行的。我们详细分析了各种测试频率下介电常数和介电损耗（损耗角正切）的温度依赖性。出现在150-300 K温度范围内的松弛tanδ峰被确定为二次β松弛。在高于300 K的温度下，tanδ的增加可以解释为接近α弛豫。在150至400 K之间的各种温度下，在200至400 nm的紫外线可见区域中进行光学测量。在不同温度下计算直接和间接带隙的值。对于较高的温度，这些值较低。在低于300 K的温度下，在285 nm左右的波长处观察到吸收峰。当这种材料用作半导体的基质时，对PET履带膜在宽温度范围内的介电和光学响应的​​洞察尤为重要。光电子或微流体设备开发中的结构。 （C）2015年Wiley Periodicals，Inc.

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