Enhanced Dielectric Strength and Capacitive Energy Density of Cyclic Polystyrene Films

被引:24
|
作者
Singh, Maninderjeet [1 ]
Dong, Mei [2 ,3 ,4 ]
Wu, Wenjie [1 ]
Nejat, Roushanak [5 ]
Tran, David K. [2 ,3 ,4 ]
Pradhan, Nihar [6 ]
Raghavan, Dharmaraj [7 ]
Douglas, Jack F. [8 ]
Wooley, Karen L. [2 ,3 ,4 ]
Karim, Alamgir [1 ]
机构
[1] Univ Houston, Dept Chem & Biomol Engn, Houston, TX 77204 USA
[2] Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA
[3] Texas A&M Univ, Dept Chem Engn & Mat Sci, College Stn, TX 77842 USA
[4] Texas A&M Univ, Dept Engn, College Stn, TX 77842 USA
[5] Univ Houston, Mat Engn Program, Houston, TX 77204 USA
[6] Jackson State Univ, Dept Chem Phys & Atmospher Sci, Jackson, MS 39217 USA
[7] Howard Univ, Dept Chem, Washington, DC 20059 USA
[8] NIST, Mat Sci & Engn Div, Gaithersburg, MD 20899 USA
来源
ACS POLYMERS AU | 2022年 / 2卷 / 05期
基金
美国国家科学基金会;
关键词
Polymeric dielectric capacitors; Cyclic polymers; Ring polymers; Capacitive energy storage; Dielectric breakdown; Free volume; Chain-ends; Polymer films; Enhancing capacitive energy density; MOLECULAR-WEIGHT; TRANSITION-TEMPERATURES; BREAKDOWN STRENGTH; BARIUM-TITANATE; POLYMER; SUPPRESSION; DEPENDENCE; ROUTE; MELT;
D O I
10.1021/acspolymersau.2c00014
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The maximum capacitive energy stored in polymeric dielectric capacitors, which are ubiquitous in high-power-density devices, is dictated by the dielectric breakdown strength of the dielectric polymer. The fundamental mechanisms of the dielectric breakdown, however, remain unclear. Based on a simple free-volume model of the polymer fluid state, we hypothesized that the free ends of linear polymer chains might act as "defect" sites, at which the dielectric breakdown can initiate. Thus, the dielectric breakdown strength of cyclic polymers should exhibit enhanced stability in comparison to that of their linear counterparts having the same composition and similar molar mass. This hypothesis is supported by the similar to 50% enhancement in the dielectric breakdown strength and similar to 80% enhancement in capacitive energy density of cyclic polystyrene melt films in comparison to corresponding linear polystyrene control films. Furthermore, we observed that cyclic polymers exhibit a denser packing density than the linear chain melts, an effect that is consistent with and could account for the observed property changes. Our work demonstrates that polymer topology can significantly influence the capacitive properties of polymer films, and correspondingly, we can expect polymer topology to influence the gas permeability, shear modulus, and other properties of thin films dependent on film density.
引用
收藏
页码:324 / 332
页数:9
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