Puente-Córdova Jesús G, Rentería-Baltiérrez Flor Y, López-Walle Beatriz, Aguilar-Garib Juan A
Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Av. Universidad s/n, Cd. Universitaria, San Nicolás de los Garza 66455, Mexico.
Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Av. Universidad s/n, Cd. Universitaria, San Nicolás de los Garza 66455, Mexico.
Polymers (Basel). 2023 Dec 16;15(24):4725. doi: 10.3390/polym15244725.
Dielectric and thermal properties of polyvinyl butyral (PVB) were studied in this work, using dynamic electrical analysis (DEA) at frequencies from 100 Hz to 1 MHz and temperatures from 293 K to 473 K. Two electrical relaxation processes were investigated: glass transition and interfacial polarization. Above the glass transition temperature (~343 K), interfacial polarization dominates conductive behavior in polyvinyl butyral. The framework of the complex electric modulus was used to obtain information about interfacial polarization. The viscoelastic behavior was analyzed through dynamic mechanical analysis (DMA), where only the mechanical manifestation of the glass transition is observed. The experimental results from dielectric measurements were analyzed with fractional calculus, using a fractional Debye model with one cap-resistor. We were successful in applying the complex electric modulus because we had a good correlation between data and theoretical predictions. The fractional order derivative is an indicator of the energy dissipated in terms of molecular mobility, and the calculated values close to 1 suggest a conductive behavior at temperatures above the glass transition temperature of PVB.
本研究采用动态电分析（DEA）方法，在100 Hz至1 MHz的频率范围以及293 K至473 K的温度范围内，对聚乙烯醇缩丁醛（PVB）的介电和热性能进行了研究。研究了两种电弛豫过程：玻璃化转变和界面极化。在玻璃化转变温度（约343 K）以上，界面极化主导了聚乙烯醇缩丁醛的导电行为。利用复电模量的框架来获取有关界面极化的信息。通过动态力学分析（DMA）对粘弹性行为进行了分析，在DMA中仅观察到玻璃化转变的力学表现。利用含一个电容电阻的分数阶德拜模型，通过分数阶微积分对介电测量的实验结果进行了分析。我们成功应用了复电模量，因为我们的数据与理论预测之间具有良好的相关性。分数阶导数是根据分子迁移率耗散能量的指标，计算值接近1表明在高于PVB玻璃化转变温度的温度下具有导电行为。
