New PTFE-polyamide compounds

Lehmann, D.; Hupfer, B.; Lappan, Uwe; Pompe, G.; Häußler, Liane; Jehnichen, Dieter; Janke, Andreas; Geißler, Uwe; Reinhardt, Robert M.; Lunkwitz, K.; Franke, R.; Kunze, Klaus

doi:10.1163/156855502760158006

Cited by 39 publications

(34 citation statements)

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“…However, electron beam modification provides a simple and effective method for modification of PTFE powder [13][14][15][16][17][18][19][20]. Recently, newly developed chemically coupled PTFE-PA compounds have opened a new way in producing high performance wearresistant materials [21][22][23]. A new class of potential wear-resistant materials based on modified PTFE powder filled SBS, NBR and EPDM compounds were also produced [24].…”

Section: Introductionmentioning

confidence: 99%

Modification of PTFE nanopowder by controlled electron beam irradiation: A useful approach for the development of PTFE coupled EPDM compounds

Khan¹,

Lehmann²,

Heinrich³

2008

Express Polym. Lett.

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Abstract. Low-temperature reactive mixing of controlled electron beam modified Polytetrafluoroethylene (PTFE) nanopowder with Ethylene-Propylene-Diene-Monomer (EPDM) rubber produced PTFE coupled EPDM rubber compounds with desired physical properties. The radiation-induced chemical alterations in PTFE nanopowder, determined by electron spin resonance (ESR) and Fourier transform infrared (FTIR) spectroscopy, showed increasing concentration of radicals and carboxylic groups (-COOH) with increasing irradiation dose. The morphological variations of the PTFE nanopowder including its decreasing mean agglomerate size with the absorbed dose was investigated by particle size and scanning electron microscopy (SEM) analysis. With increasing absorbed dose the wettability of the modified PTFE nanopowder determined by contact angle method increased in accordance with the (-COOH) concentration. Transmission electron microscopy (TEM) showed that modified PTFE nanopowder is obviously enwrapped by EPDM. This leads to a characteristic compatible interphase around the modified PTFE. Crystallization studies by differential scanning calorimetry (DSC) also revealed the existence of a compatible interphase in the modified PTFE coupled EPDM. Vol.2, No.4 (2008) [284][285][286][287][288][289][290][291][292][293] Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2008.34 powder was specially utilized in NBR to expand its utility as wear-resistant material for sealing applications [25]. PTFE micropowders produced by emulsion polymerization are low-molecular weight fine coagulated powder commonly used as an additive in variety of applications [26][27]. In the previous study, PTFE coupled EPDM compounds were produced by reactive mixing of pre-modified PTFE nanopowder with EPDM [28]. In the present work the influence of dose-controlled agglomerate size, structural morphology and interfacial compatibility of PTFE nanopowder on the physical properties of the resulting modified PTFE-EPDM blends are presented. These investigations are of extreme importance especially in the development of new rubber compounds which require optimization of both the physical and tribological properties [29][30]. It has been shown that the desired physical properties can be achieved simply by controlled modification of PTFE nanopowder. Keywords: mechanical properties, PTFE nanopowder, EPDM, electron beam irradiation, compatibility eXPRESS Polymer Letters Materials and experimental MaterialsBoth EPDM (Buna EP G 6850) with ethylidene norbornene (ENB) content 7.7 wt%; ethylene content 51 wt%; Mooney viscosity, ML (1+4) at 125°C, 60; ash content 0.2 wt%; specific gravity, 0.86; and peroxide (Perkadox 14-40 MB GR) were supplied from Lanxess Deutschland GmbH, Germany while coagent (R-20S/Saret 634C) was used from Sartomer, USA. Algoflon L100X an emulsion grade received from Solvay Solexis S.p.A, Italy is an agglomerated white PTFE nanopowder with the bulk density and surface area of 0.25-0.44 g·cm -3 and 26 g·m -2 , respectively. Modification of...

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Section: Introductionmentioning

confidence: 99%

Modification of PTFE nanopowder by controlled electron beam irradiation: A useful approach for the development of PTFE coupled EPDM compounds

Khan¹,

Lehmann²,

Heinrich³

2008

Express Polym. Lett.

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“…5 Mechanism of the formation of PTFE-PA block copolymers [18] PTFE-Based Rubber Composites for Tribological Applications 257…”

Section: Chemically Coupled Ptfe-based Compoundsmentioning

confidence: 99%

PTFE-Based Rubber Composites for Tribological Applications

Khan

Heinrich

2010

Advanced Rubber Composites

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The unique properties of rubber, along with its diverse applications, have prompted a great deal of interest among researchers to explore advanced multifunctional materials for special purpose applications by incorporating various filler materials into the rubber matrix. This article deals with the application of a relatively new class of materials based on the addition of polytetrafluoroethylene (PTFE) powder to rubber matrixes for preparing PTFE-based elastomeric composites. Besides other properties, the remarkably low friction coefficient of PTFE enables its utilization for tribological applications. However, PTFE in rubbers has not been fully explored, mainly due to its inherent chemical inertness and incompatibility. The present work describes the electron modification of PTFE powder to improve its compatibility with rubber matrixes, the state of the art regarding its application in rubbers, and the preparation of PTFE-based elastomeric composites for tribological applications. It has been demonstrated that, in addition to the improvement in engineering properties, the chemical coupling of modified PTFE powder with rubber matrixes can significantly improve the friction and wear properties of the host elastomer. In addition, a new class of chloroprene composites, with exceptional mechanical and dispersion properties due to chemical coupling of electron-modified PTFE particles and chloroprene rubbers, has been produced. An explanation of the proposed chemical reaction mechanism between the irradiated PTFE and chloroprene rubber, along with a detailed characterization of the compatibility, dispersion, and chemical coupling is presented.

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“…Among them, chemical modification during blending has proved to be an effective method. [2,3] In the present article, polyamide 6 (PA 6) is chosen as the second component in the binary blends with polytetrafluoroethylene (PTFE) due to its importance in the field of engineering plastics. Such PA 6/PTFE blends with various compositions are prepared by the reactive extrusion during which trans-amidation reaction occurs between the amino or amide group of PA 6 matrix and the carboxyl group of PTFE micro-powders.…”

Section: Introductionmentioning

confidence: 99%

“…Such PA 6/PTFE blends with various compositions are prepared by the reactive extrusion during which trans-amidation reaction occurs between the amino or amide group of PA 6 matrix and the carboxyl group of PTFE micro-powders. [2,3] The carboxyl group on the surface of PTFE micro-powders is created by pre-modification with electron irradiation under ambient condition. A schematic route is shown as follows:…”

Section: Introductionmentioning

confidence: 99%

Miscibility and Crystallization Behaviors of Polyamide 6/Polytetrafluoroethylene Blends

Song

Zhao

Stamm

2004

Macro Materials & Eng

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Summary: The miscibility and crystallization behaviors of polyamide 6 (PA 6)/polytetrafluoroethylene (PTFE) blends, prepared via reactive extrusion, are systematically investigated by means of wide‐angle X‐ray diffraction (WAXD), differential scanning calorimetry (DSC), and dynamic mechanical thermal analysis (DMTA). WAXD measurements show that no co‐crystallization occurred between two components, while DSC and DMTA measurements suggest that a certain degree of miscibility between them might exist due to the formation of some copolymers during the reactive extrusion.

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New PTFE-polyamide compounds

Cited by 39 publications

References 1 publication

Modification of PTFE nanopowder by controlled electron beam irradiation: A useful approach for the development of PTFE coupled EPDM compounds

Modification of PTFE nanopowder by controlled electron beam irradiation: A useful approach for the development of PTFE coupled EPDM compounds

PTFE-Based Rubber Composites for Tribological Applications

Miscibility and Crystallization Behaviors of Polyamide 6/Polytetrafluoroethylene Blends

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