Crystalline microstructure and dielectric properties of oriented poly(ethylene-co-tetrafluoroethylene)

POLYMER

卷:113

Article

Huang, Yun¹  Miranda, Daniel F.^1,2  Iacob, Ciprian¹  Zhang, Shihai³  Runt, James¹ 

[1] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[2] Sichuan Univ, Polymer Res Inst, State Key Lab Polymer Mat Engn China, Chengdu 610065, Peoples R China

[3] PolyK Technol LLC, 2124 Old Gatesburg Rd, State Coll, PA 16803 USA

关键词: Crystalline polymer microstructure;    Dielectric breakdown;    Polymer dynamics;   

DOI  :  10.1016/j.polymer.2017.02.038

来源: Elsevier

【 摘 要 】

In the present investigation, we explore the influence of uniaxial orientation and subsequent thermal annealing on semi-crystalline poly(ethylene-tetrafluoroethylene) (ETFE) microstructure and dynamics, and the connection to dielectric breakdown strength. Understanding the influence of crystalline microstructure on dynamics and breakdown, and in turn how processing influences microstructure, is critical for establishing rational design of polymer dielectrics. When drawn below the glass transition temperature (Tg), the Weibull breakdown strength decreases compared to that of the undrawn precursor film, but increases on thermal annealing near or above Tg. This behavior is associated with the formation and elimination of drawing-induced microvoids, respectively. When drawn above Tg, the breakdown strength increases to 870 MV/cm, dominated by orientation of amorphous segments, and decreases on thermal annealing above Tg to near that of the undrawn film. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free