Modeling Dynamics of Isotropic Dielectrics in a Laminar Heterogeneous Configuration

详细信息    查看全文

• 作者：Ruel McKenzie ; Walter Zurawsky ; Jovan Mijovic
• 刊名：The Journal of Physical Chemistry B
• 出版年：2012
• 出版时间：April 12, 2012
• 年：2012
• 卷：116
• 期：14
• 页码：4346-4353
• 全文大小：573K
• 年卷期：v.116,no.14(April 12, 2012)
• ISSN：1520-5207

文摘

The predictive capabilities of models that satisfy the Weiner bounds and Hashin鈥揝htrikman (HS) bounds were studied for isotropic dielectrics in a laminar heterogeneous configuration oriented perpendicular to the electric field. The dynamics were investigated isothermally using broadband dielectric relaxation spectroscopy (DRS) in the frequency range of 1 MHz to 100 mHz. The molecules chosen for study were low molecular weight glass formers, glycerol, phenyl salicylate, imidazole, and dimethyl sulfoxide, and macromolecules, polymethylhydrosiloxane, polyvinylpyrrolidone-co-vinyl acetate, poly-dl-lactic acid, and poly l-lactic acid. It was found that none of the models were able to adequately predict in entirety the resultant dynamics. Of the models studied, the most successful were the HS upper bound (HSUB), the complementary universal Weiner equation (CWE), and the Lichtenecker model for the dimensional parameter, 味 = 鈭?/2. The least successful models were the upper Weiner bound (UWB), the Neelakantaswamy, Turkman, and Sarkar (NTS) model for 味 = 1/2, and the Lichtenecker model for 味 = 1/2.