Plasma modified Polytetrafluoroethylene (PTFE) lubrication of α-olefin-copolymer impact-modified Polyamide 66

Harald Hunke, Navneet Soin, Andreas Gebhard, Tahir Shah, Erich Kramer, Kurt Witan, Anand Arcot Narasimulu, Elias Siores

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Tribological and mechanical properties of α-olefin-copolymer, impact-modified Polyamide 66, containing pristine and plasma treated Polytetrafluoroethylene (PTFE) micro-powders as solid-lubricants have been investigated. The PTFE powders were subjected to low pressure 2.45GHz microwave plasma treatment with H2 and NH3 as the process gases to aid their dispersion in PA66. Formation of polar surface groups in conjunction with significant defluorination was observed for both H2 (F/C atomic ratio 1.30) and NH3 (F/C atomic ratio 1.13) plasma treated powders. The H2 PTFE-impact modified PA66 composites exhibited a 25% increase in their impact energy absorption capabilities (25.0J) than their pristine counterparts (20.0J), along with a significant reduction of the specific wear rate at higher pv-values. At the pv-value of 6MPam/s, the specific wear rates for composites containing hydrogen plasma treated PTFE and nitrogen plasma treated PTFE were reduced by 33% (0.7×10-6mm3/Nm) and 50% (0.6×10-6mm3/Nm), respectively, as compared to pristine PTFE-α-olefin PA66 composites (1.1×10-6mm3/Nm); while showing similar coefficient of friction values. The use of plasma functionalized PTFE powders thus provides a facile route for the production of impact modified PA66 compounds with significantly lower coefficient of friction and higher wear resistance for applications like bearings and sliding elements where impact strength as well as good tribological properties are required.

LanguageEnglish
Pages122-132
Number of pages11
JournalWEAR
Volume338-339
DOIs
Publication statusPublished - 11 Jun 2015

Fingerprint

polytetrafluoroethylene
Nylons
Polytetrafluoroethylene
Alkenes
lubrication
Polyamides
Polytetrafluoroethylenes
alkenes
Olefins
Lubrication
copolymers
Copolymers
Plasmas
Powders
coefficient of friction
composite materials
Composite materials
Bearings (structural)
defluorination
Wear of materials

Keywords

  • Impact modification
  • Plasma treatment
  • Polyamide 66
  • Polytetrafluoroetyhlene (PTFE)
  • Solid lubricants
  • Wear

Cite this

Hunke, Harald ; Soin, Navneet ; Gebhard, Andreas ; Shah, Tahir ; Kramer, Erich ; Witan, Kurt ; Narasimulu, Anand Arcot ; Siores, Elias. / Plasma modified Polytetrafluoroethylene (PTFE) lubrication of α-olefin-copolymer impact-modified Polyamide 66. 2015 ; Vol. 338-339. pp. 122-132.
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abstract = "Tribological and mechanical properties of α-olefin-copolymer, impact-modified Polyamide 66, containing pristine and plasma treated Polytetrafluoroethylene (PTFE) micro-powders as solid-lubricants have been investigated. The PTFE powders were subjected to low pressure 2.45GHz microwave plasma treatment with H2 and NH3 as the process gases to aid their dispersion in PA66. Formation of polar surface groups in conjunction with significant defluorination was observed for both H2 (F/C atomic ratio 1.30) and NH3 (F/C atomic ratio 1.13) plasma treated powders. The H2 PTFE-impact modified PA66 composites exhibited a 25{\%} increase in their impact energy absorption capabilities (25.0J) than their pristine counterparts (20.0J), along with a significant reduction of the specific wear rate at higher pv-values. At the pv-value of 6MPam/s, the specific wear rates for composites containing hydrogen plasma treated PTFE and nitrogen plasma treated PTFE were reduced by 33{\%} (0.7×10-6mm3/Nm) and 50{\%} (0.6×10-6mm3/Nm), respectively, as compared to pristine PTFE-α-olefin PA66 composites (1.1×10-6mm3/Nm); while showing similar coefficient of friction values. The use of plasma functionalized PTFE powders thus provides a facile route for the production of impact modified PA66 compounds with significantly lower coefficient of friction and higher wear resistance for applications like bearings and sliding elements where impact strength as well as good tribological properties are required.",
keywords = "Impact modification, Plasma treatment, Polyamide 66, Polytetrafluoroetyhlene (PTFE), Solid lubricants, Wear",
author = "Harald Hunke and Navneet Soin and Andreas Gebhard and Tahir Shah and Erich Kramer and Kurt Witan and Narasimulu, {Anand Arcot} and Elias Siores",
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Hunke, H, Soin, N, Gebhard, A, Shah, T, Kramer, E, Witan, K, Narasimulu, AA & Siores, E 2015, 'Plasma modified Polytetrafluoroethylene (PTFE) lubrication of α-olefin-copolymer impact-modified Polyamide 66', vol. 338-339, pp. 122-132. https://doi.org/10.1016/j.wear.2015.06.003

Plasma modified Polytetrafluoroethylene (PTFE) lubrication of α-olefin-copolymer impact-modified Polyamide 66. / Hunke, Harald; Soin, Navneet; Gebhard, Andreas; Shah, Tahir; Kramer, Erich; Witan, Kurt; Narasimulu, Anand Arcot; Siores, Elias.

Vol. 338-339, 11.06.2015, p. 122-132.

Research output: Contribution to journalArticle

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T1 - Plasma modified Polytetrafluoroethylene (PTFE) lubrication of α-olefin-copolymer impact-modified Polyamide 66

AU - Hunke, Harald

AU - Soin, Navneet

AU - Gebhard, Andreas

AU - Shah, Tahir

AU - Kramer, Erich

AU - Witan, Kurt

AU - Narasimulu, Anand Arcot

AU - Siores, Elias

PY - 2015/6/11

Y1 - 2015/6/11

N2 - Tribological and mechanical properties of α-olefin-copolymer, impact-modified Polyamide 66, containing pristine and plasma treated Polytetrafluoroethylene (PTFE) micro-powders as solid-lubricants have been investigated. The PTFE powders were subjected to low pressure 2.45GHz microwave plasma treatment with H2 and NH3 as the process gases to aid their dispersion in PA66. Formation of polar surface groups in conjunction with significant defluorination was observed for both H2 (F/C atomic ratio 1.30) and NH3 (F/C atomic ratio 1.13) plasma treated powders. The H2 PTFE-impact modified PA66 composites exhibited a 25% increase in their impact energy absorption capabilities (25.0J) than their pristine counterparts (20.0J), along with a significant reduction of the specific wear rate at higher pv-values. At the pv-value of 6MPam/s, the specific wear rates for composites containing hydrogen plasma treated PTFE and nitrogen plasma treated PTFE were reduced by 33% (0.7×10-6mm3/Nm) and 50% (0.6×10-6mm3/Nm), respectively, as compared to pristine PTFE-α-olefin PA66 composites (1.1×10-6mm3/Nm); while showing similar coefficient of friction values. The use of plasma functionalized PTFE powders thus provides a facile route for the production of impact modified PA66 compounds with significantly lower coefficient of friction and higher wear resistance for applications like bearings and sliding elements where impact strength as well as good tribological properties are required.

AB - Tribological and mechanical properties of α-olefin-copolymer, impact-modified Polyamide 66, containing pristine and plasma treated Polytetrafluoroethylene (PTFE) micro-powders as solid-lubricants have been investigated. The PTFE powders were subjected to low pressure 2.45GHz microwave plasma treatment with H2 and NH3 as the process gases to aid their dispersion in PA66. Formation of polar surface groups in conjunction with significant defluorination was observed for both H2 (F/C atomic ratio 1.30) and NH3 (F/C atomic ratio 1.13) plasma treated powders. The H2 PTFE-impact modified PA66 composites exhibited a 25% increase in their impact energy absorption capabilities (25.0J) than their pristine counterparts (20.0J), along with a significant reduction of the specific wear rate at higher pv-values. At the pv-value of 6MPam/s, the specific wear rates for composites containing hydrogen plasma treated PTFE and nitrogen plasma treated PTFE were reduced by 33% (0.7×10-6mm3/Nm) and 50% (0.6×10-6mm3/Nm), respectively, as compared to pristine PTFE-α-olefin PA66 composites (1.1×10-6mm3/Nm); while showing similar coefficient of friction values. The use of plasma functionalized PTFE powders thus provides a facile route for the production of impact modified PA66 compounds with significantly lower coefficient of friction and higher wear resistance for applications like bearings and sliding elements where impact strength as well as good tribological properties are required.

KW - Impact modification

KW - Plasma treatment

KW - Polyamide 66

KW - Polytetrafluoroetyhlene (PTFE)

KW - Solid lubricants

KW - Wear

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