Influence of plasma pre-treatment of polytetrafluoroethylene (PTFE) micropowders on the mechanical and tribological performance of Polyethersulfone (PESU)-PTFE composites

Harald Hunke, Navneet Soin, Tahir Shah, Erich Kramer, Kurt Witan, Elias Siores

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Tribological and mechanical properties of Polyethersulfone (PESU) composites, containing pristine and plasma modified polytetrafluoroethylene (PTFE) micro-powders as solid-lubricants have been investigated. Low pressure 2.45GHz microwave plasma functionalisation of PTFE powders was carried out using H2 and NH3 as process gases to introduce functional polar groups on the PTFE surfaces to enhance their wettability and mixing with PESU. As compared to pristine PTFE (F/C atomic ratio 1.86), X-ray photoelectron spectroscopy analysis confirmed the significant deflourination for both the NH3 (F/C atomic ratio 1.13) and H2 (F/C atomic ratio 1.30) plasma treated samples along with the attachment of polar surface moieties. An increase in the interaction between the plasma functionalised PTFE powders with PESU matrix was confirmed based on an increase in the glass transition temperature of the PESU-PTFE composites. The plasma treated PTFE-PESU composites exhibited nearly 75% higher force absorption capabilities (3.3kN) than their pristine PTFE-PESU counterparts (0.96kN). Moreover, the plasma treated PTFE-PESU composites exhibited a wear rate (3.42±0.51×10-06mm3/Nm) which was nearly half of that of pristine PTFE-PESU composites (5.75±0.80×10-06mm3/Nm). Thus, low-pressure microwave plasma modification offers an efficient route for surface functionalisation of solid lubricants, like PTFE, for enhanced dispersion in high-performance polymers.

LanguageEnglish
Pages480-487
Number of pages8
JournalWEAR
Volume328-329
DOIs
Publication statusPublished - 11 Mar 2015

Fingerprint

polytetrafluoroethylene
Polytetrafluoroethylene
Polytetrafluoroethylenes
pretreatment
Plasmas
composite materials
Composite materials
Powders
solid lubricants
Solid lubricants
polyether sulfone
low pressure
Microwaves
microwaves
Beam plasma interactions
wettability
glass transition temperature
attachment
Wetting
Polymers

Keywords

  • Plasma treatment
  • Polyethersulfone (PESU)
  • Polymers
  • Polytetrafluoroethylene (PTFE)
  • Solid lubricants
  • Wear

Cite this

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title = "Influence of plasma pre-treatment of polytetrafluoroethylene (PTFE) micropowders on the mechanical and tribological performance of Polyethersulfone (PESU)-PTFE composites",
abstract = "Tribological and mechanical properties of Polyethersulfone (PESU) composites, containing pristine and plasma modified polytetrafluoroethylene (PTFE) micro-powders as solid-lubricants have been investigated. Low pressure 2.45GHz microwave plasma functionalisation of PTFE powders was carried out using H2 and NH3 as process gases to introduce functional polar groups on the PTFE surfaces to enhance their wettability and mixing with PESU. As compared to pristine PTFE (F/C atomic ratio 1.86), X-ray photoelectron spectroscopy analysis confirmed the significant deflourination for both the NH3 (F/C atomic ratio 1.13) and H2 (F/C atomic ratio 1.30) plasma treated samples along with the attachment of polar surface moieties. An increase in the interaction between the plasma functionalised PTFE powders with PESU matrix was confirmed based on an increase in the glass transition temperature of the PESU-PTFE composites. The plasma treated PTFE-PESU composites exhibited nearly 75{\%} higher force absorption capabilities (3.3kN) than their pristine PTFE-PESU counterparts (0.96kN). Moreover, the plasma treated PTFE-PESU composites exhibited a wear rate (3.42±0.51×10-06mm3/Nm) which was nearly half of that of pristine PTFE-PESU composites (5.75±0.80×10-06mm3/Nm). Thus, low-pressure microwave plasma modification offers an efficient route for surface functionalisation of solid lubricants, like PTFE, for enhanced dispersion in high-performance polymers.",
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Influence of plasma pre-treatment of polytetrafluoroethylene (PTFE) micropowders on the mechanical and tribological performance of Polyethersulfone (PESU)-PTFE composites. / Hunke, Harald; Soin, Navneet; Shah, Tahir; Kramer, Erich; Witan, Kurt; Siores, Elias.

Vol. 328-329, 11.03.2015, p. 480-487.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Influence of plasma pre-treatment of polytetrafluoroethylene (PTFE) micropowders on the mechanical and tribological performance of Polyethersulfone (PESU)-PTFE composites

AU - Hunke, Harald

AU - Soin, Navneet

AU - Shah, Tahir

AU - Kramer, Erich

AU - Witan, Kurt

AU - Siores, Elias

PY - 2015/3/11

Y1 - 2015/3/11

N2 - Tribological and mechanical properties of Polyethersulfone (PESU) composites, containing pristine and plasma modified polytetrafluoroethylene (PTFE) micro-powders as solid-lubricants have been investigated. Low pressure 2.45GHz microwave plasma functionalisation of PTFE powders was carried out using H2 and NH3 as process gases to introduce functional polar groups on the PTFE surfaces to enhance their wettability and mixing with PESU. As compared to pristine PTFE (F/C atomic ratio 1.86), X-ray photoelectron spectroscopy analysis confirmed the significant deflourination for both the NH3 (F/C atomic ratio 1.13) and H2 (F/C atomic ratio 1.30) plasma treated samples along with the attachment of polar surface moieties. An increase in the interaction between the plasma functionalised PTFE powders with PESU matrix was confirmed based on an increase in the glass transition temperature of the PESU-PTFE composites. The plasma treated PTFE-PESU composites exhibited nearly 75% higher force absorption capabilities (3.3kN) than their pristine PTFE-PESU counterparts (0.96kN). Moreover, the plasma treated PTFE-PESU composites exhibited a wear rate (3.42±0.51×10-06mm3/Nm) which was nearly half of that of pristine PTFE-PESU composites (5.75±0.80×10-06mm3/Nm). Thus, low-pressure microwave plasma modification offers an efficient route for surface functionalisation of solid lubricants, like PTFE, for enhanced dispersion in high-performance polymers.

AB - Tribological and mechanical properties of Polyethersulfone (PESU) composites, containing pristine and plasma modified polytetrafluoroethylene (PTFE) micro-powders as solid-lubricants have been investigated. Low pressure 2.45GHz microwave plasma functionalisation of PTFE powders was carried out using H2 and NH3 as process gases to introduce functional polar groups on the PTFE surfaces to enhance their wettability and mixing with PESU. As compared to pristine PTFE (F/C atomic ratio 1.86), X-ray photoelectron spectroscopy analysis confirmed the significant deflourination for both the NH3 (F/C atomic ratio 1.13) and H2 (F/C atomic ratio 1.30) plasma treated samples along with the attachment of polar surface moieties. An increase in the interaction between the plasma functionalised PTFE powders with PESU matrix was confirmed based on an increase in the glass transition temperature of the PESU-PTFE composites. The plasma treated PTFE-PESU composites exhibited nearly 75% higher force absorption capabilities (3.3kN) than their pristine PTFE-PESU counterparts (0.96kN). Moreover, the plasma treated PTFE-PESU composites exhibited a wear rate (3.42±0.51×10-06mm3/Nm) which was nearly half of that of pristine PTFE-PESU composites (5.75±0.80×10-06mm3/Nm). Thus, low-pressure microwave plasma modification offers an efficient route for surface functionalisation of solid lubricants, like PTFE, for enhanced dispersion in high-performance polymers.

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KW - Polyethersulfone (PESU)

KW - Polymers

KW - Polytetrafluoroethylene (PTFE)

KW - Solid lubricants

KW - Wear

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