Improving electric thermal stability of polypropylene by chemically linking small amount of hindered phenol groups

Xin Chen; Wenyi Zhu; Q M Zhang

doi:10.1557/s43580-021-00016-1

Improving electric thermal stability of polypropylene by chemically linking small amount of hindered phenol groups

MRS Adv. 2021;6(12):321-326. doi: 10.1557/s43580-021-00016-1. Epub 2021 Feb 3.

Authors

Xin Chen^{1

2}, Wenyi Zhu^{1

3}, Q M Zhang^{1

2

3}

Affiliations

¹ Materials Research Institute, The Pennsylvania State University, University Park, PA 16802 USA.
² Materials Science and Engineering Department, The Pennsylvania State University, University Park, PA 16802 USA.
³ Electrical Engineering Department, The Pennsylvania State University, University Park, PA 16802 USA.

Abstract

Thermal stability of polypropylene (PP) over a broad temperature is critical for many applications. Hindered phenol (HP) groups have been utilized in PP for thermal-oxidative protection. This paper studies thermal stability of the electret property of PP linked with 0.2 mol% HP. It is observed that small amount of chemically linked HP groups improves electret thermal stability as reflected by the higher peak temperature of the thermally stimulated discharge curve and about 65% increase in the trap level. In addition, the HP groups in PP generate "rigid backbones" which maintain the PP film shapes to temperatures near the melting (~ 150 °C), compared with pristine PP at 70 °C.

Supplementary information: The online version of this article (10.1557/s43580-021-00016-1) contains supplementary material, which is available to authorized users.

Keywords: Dielectric; Polymer electrets; Polypropylene; Thermal-stability.