Low-pressure H₂, NH₃ microwave plasma treatment of Polytetrafluoroethylene (PTFE) powders: chemical, thermal and wettability analysis.

Hunke, Harald, Soin, Navneet ORCID: 0000-0002-0196-2071, Shah, Tahir H., Kramer, Erich, Pascual, Alfons, Karuna, Mallampalli S.L. and Siores, E. ORCID: 0000-0003-2971-9580 (2015) Low-pressure H₂, NH₃ microwave plasma treatment of Polytetrafluoroethylene (PTFE) powders: chemical, thermal and wettability analysis. Materials, 8 (5). pp. 2258-2275. ISSN 1996-1944

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Abstract

Functionalization of Polytetrafluoroethylene (PTFE) powders of ~6 μm particle size is carried out using low-pressure 2.45 GHz H₂, NH₃ microwave plasmas for various durations (2.5, 10 h) to chemically modify their surface and alter their surface energy. The X-ray Photoelectron Spectroscopy (XPS) analyses reveal that plasma treatment leads to significant defluorination (F/C atomic ratio of 1.13 and 1.30 for 10 h NH₃ and H₂ plasma treatments, respectively vs. 1.86 for pristine PTFE), along with the incorporation of functional polar moieties on the surface, resulting in enhanced wettability. Analysis of temperature dependent XPS revealed a loss of surface moieties above 200 °C, however, the functional groups are not completely removable even at higher temperatures (>300 °C), thus enabling the use of plasma treated PTFE powders as potential tribological fillers in high temperature engineering polymers. Ageing studies carried over a period of 12 months revealed that while the surface changes degenerate over time, again, they are not completely reversible. These functionalised PTFE powders can be further used for applications into smart, high performance materials such as tribological fillers for engineering polymers and bio-medical, bio-material applications.

Item Type: Article
Additional Information: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license,(CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords: polytetrafluoroethylene (PTFE),low-pressure microwave plasma, ESCA/XPS, degeneration,thermal stability
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
Depositing User: Tracey Gill
Date Deposited: 08 Apr 2016 13:38
Last Modified: 01 Jun 2018 08:15
Identification Number: 10.3390/ma8052258
URI: http://ubir.bolton.ac.uk/id/eprint/838

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