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β-Phase Formation of Polyvinylidene Fluoride via Hot Pressing under Cyclic Pulsating Pressure by Zhao-Xia Huang; Meng-Meng Wang; Yan-Hong Feng; Jin-Ping Qu is a Materials Science article available to read on EtoBox.

What is β-Phase Formation of Polyvinylidene Fluoride via Hot Pressing under Cyclic Pulsating Pressure about?

Phase control is now challenging the manufacturing of electroactive polyvinylidene fluoride (PVDF) toward energy storage applications. Currently, the state-of-the-art approach in fabricating virgin, unfilled PVDF with predominantly the β-phase always needs complex procedures and requires extreme processing conditions. Herein, for the first time, we fabricated PVDF with a controlled β-phase under mild processing conditions by introducing a cyclic pulsating pressure (CPP) during hot pressing. Fouriertransform infrared spectroscopy and wide-angle X-ray diffraction revealed the relationship between the β-phase fraction and CPP condition. Consequently, we obtained melt-processed, virgin, and unfilled PVDF with 72.2% β-phase, as well as enhanced dielectric and mechanical properties, under hot pressing with a maximum pressure as low as 40 MPa. The mechanism of volume reduction-induced β-phase formation was proposed and verified. Moreover, in contrast to the conventional understanding of the phase transition that requires continuous ultrahigh pressure, we find that the inclusion of the relaxation process can further promote the formation of the β-phase. We believe that this work breaks exi

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Author

Zhao-Xia Huang; Meng-Meng Wang; Yan-Hong Feng; Jin-Ping Qu

Publisher

American Chemical Society (ACS)

Published

2020

Language

EN

Field

Materials Science (Physical Sciences)