Pyroelectric properties and dielectric hysteresis of a poly(vinyl alcohol) with azobenzene-alkoxy side chains
Pyroelectric properties and dielectric hysteresis of a poly(vinyl alcohol) with azobenzene-alkoxy side chains
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DOI：
10.1016/s0032-3861(98)00563-1
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发表时间：
1999-06
期刊：
影响因子：
4.6
通讯作者：
P. Frübing;M. Wegener;R. Gerhard-Multhaupt;A. Buchsteiner;W. Neumann;L. Brehmer
中科院分区：
文献类型：
--
作者：
P. Frübing;M. Wegener;R. Gerhard-Multhaupt;A. Buchsteiner;W. Neumann;L. Brehmer
热极化后，在偶氮苯-烷氧基侧链（Az-PVA）的聚乙烯醇薄膜上观察到热释电和明显的介电滞后。根据介电光谱数据和差热分析的结构信息，热释电可以用热膨胀过程中可逆的偶极子密度变化来解释，而介电滞后则是由电荷载流子（可能是离子）引起的极化造成的。这些发现对于解释其他聚合物-驻极体材料的介电滞后测量也具有重要意义。
After thermal poling, pyroelectricity and a pronounced dielectric hysteresis have been observed on films of a poly(vinyl alcohol) with azobenzene-alkoxy side chains (Az-PVA). Based on dielectric spectroscopy data and structural information from differential thermal analysis, the pyroelectricity can be explained with reversible dipole–density changes during thermal expansion, whereas the dielectric hysteresis is proposed to result from the polarisation caused by charge carriers, probably ions. These findings are also significant for the interpretation of dielectric hysteresis measurements on other polymer-electret materials.