Effect of the corona treatment on the microstructure of PVDF probed by electrochemical impedance spectroscopy

• Published in: Materials research express Vol. 6; no. 1; pp. 15044 - 15048
• Main Authors: Luo, Qi-Zhao, Huang, Qing, Chen, Zhe, Yao, Lei, Fu, Ping, Lin, Zhi-Dong, Li, Jing-Jing, He, Chun-Qing, Fang, Peng-Fei
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.01.2019
• Subjects: corona treatment; electrochemical impedance spectroscopy; hole structure; polyvinylidene fluoride
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/aae87e

The microstructure of Polyvinylidene Fluoride (PVDF) membrane treated by corona was investigated in this study. The crystalline structure of PVDF membrane was confirmed by x-ray diffraction (XRD), and the hole structure was evaluated by electrochemical impedance spectroscopy (EIS). It was found that the β phase appears in XRD pattern for treated PVDF, implying the polarization during corona treatment. The variation of membrane resistance suggested that the hole structure of PVDF became more porous with increasing treated time from 0 h to 2 h firstly, then became denser with treated time from 2 h to 4 h, and finally cracked at the treated time longer than 4 h. All the results indicated that corona treatment would induce the change of the bulk structure of PVDF membrane.