Wetting and friction behavior of chemically bonded PA-PTFE-oil compounds

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Thanh Duong Nguyen - , Chair of Organic Chemistry of Polymers, Leibniz Institute of Polymer Research Dresden (Author)
  • Negin Farshchi - , Chair of Polymer Materials, Leibniz Institute of Polymer Research Dresden, TUD Dresden University of Technology (Author)
  • Tim Thomas Johannes Ulbricht - , Leibniz Institute of Polymer Research Dresden (Author)
  • Thomas Schmidt - , Leibniz Institute of Polymer Research Dresden (Author)
  • Anne Marschner - , Leibniz Institute of Polymer Research Dresden (Author)
  • Guenter K. Auernhammer - , Leibniz Institute of Polymer Research Dresden (Author)
  • Markus Stommel - , Chair of Polymer Materials, Leibniz Institute of Polymer Research Dresden, TUD Dresden University of Technology (Author)
  • Brigitte Voit - , Chair of Organic Chemistry of Polymers, Leibniz Institute of Polymer Research Dresden, TUD Dresden University of Technology (Author)
  • Michaela Gedan-Smolka - , Leibniz Institute of Polymer Research Dresden (Author)

Abstract

Polyamide (PA), polytetrafluoroethylene (PTFE), and olefinic oils are incompatible. High-energy radiation in the presence of oxygen can break the PTFE chain, generating hydrophilic functional groups (COF, COOH) and peroxy-radicals. Based on the functional groups and radicals, it is possible to establish a chemical bond between PA and PTFE as well as between PTFE and olefinic oil molecules. This study prepared PA-PTFE-oil-cb compounds (cb: chemically bonded) by reactive extrusion. The compounds wetting behavior are analyzed by contact angle measurement. Additionally, the sliding properties of the compound are investigated by micro friction testing against stainless steel. Due to good fragmentation and dispersion of PTFE in PA12 matrix, the PA12-MP1100-cb and PA12-MP1100-MO-cb compounds show a slight change in wetting behavior compared to virgin PA12. In contrast, the wetting behavior of compounds based on PA46 increases dramatically compared to virgin PA46. Moreover, due to the chemical bonding, the PA-PTFE-cb compound surface is significantly smoother than a physical blend used as a model compound. Similarly, the compounds based on PA12 and PA66-matrix show improved tribological properties compared to PA46-based compounds. COF values for PA66 and PA12-Z7321 are 0.69 and 0.55, respectively. In comparison, PA66-MP1100-MO-cb and PA12-MP1100-MO-cb (Z7321) have COF value of 0.34 and 0.38, respectively.

Details

Original languageEnglish
Pages (from-to)1818-1827
Number of pages10
JournalJournal of Polymer Science
Volume61
Issue number16
Early online dateMar 2023
Publication statusPublished - 15 Aug 2023
Peer-reviewedYes

External IDs

Scopus 85150929103
ORCID /0000-0002-4531-691X/work/148608051
Mendeley 52891e5a-5dff-3cc0-a294-4605c45067cf

Keywords

Keywords

  • Chemically bonded polyamide-polytetrafluoroethylene-oil, Friction behavior, Surface roughness, Wetting behavior, chemically bonded polyamide-polytetrafluoroethylene-oil, friction behavior, surface roughness, wetting behavior