Preface

Ebnesajjad, Sina

doi:10.1016/b978-188420784-6.50002-1

Cited by 13 publications

(29 citation statements)

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“…As already mentioned, the materials offering both viscous and elastic behavior. Modulus of elasticity thus has an elastic portion, the storage modulus E', and a viscous component, the loss modulus E'', as shown in preliminary investigations [15].…”

Section: Dma-analysismentioning

confidence: 74%

Developing a roadmap of the modified PTFEs - characterization of a high-performance material

Tebbe¹

2016

Zeitschrift Kunststofftechnik

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Developing a roadmap of the modified PTFEscharacterization of a high-performance material In the present work, for the first time non-, low-and high-modified PTFE-materials were analyzed in terms of chemical and physical properties to set up a detailed fingerprint of each material. Based on these fingerprints, it is possible to completely define a PTFE roadmap. The basic properties of each material, the chemical composition and the polymer structures are used to define its position on the map. It is also shown how by well-balancing molecular weight and modifier content the property profile of the materials can be tailored to the specific requirements and applications. Thus, this PTFE roadmap can be considered as an important tool for material selection to choose the right material for the best fit between requirements and material performance. Entwicklung einer Landkarte für modifizierte PTFEs-Charakterisierung eines Hochleistungswerkstoffes In der vorliegenden Arbeit wurden erstmalig nicht-, niedrig und hoch-modifizierte PTFE Werkstoffe bezüglich ihrer chemischen und physikalischen Eigenschaften analysiert, um hiermit einen detaillierten Fingerabdruck für jedes Material aufzustellen. Unter Verwendung dieser Fingerabdrücke wurde eine komplette PTFE Landkarte erstellt, in der jedes Produkt den entsprechend seiner charakteristischen Eigenschaften definierten Platz einnimmt. Die Basiseigenschaften, die chemische Zusammensetzung und die daraus resultierenden Polymerstrukturen wurden genutzt, um seine Position in dieser Karte festzulegen. Außerdem wird gezeigt, wie durch ein exaktes Ausbalancieren von Molekulargewicht und Modifiziergehalt das Eigenschaftsprofil der Materialien maßgeschneidert werden kann, um die speziellen Anforderungen der jeweiligen Anwendungen zu erfüllen. Diese PTFE-Landkarte kann als ein wichtiges Werkzeug für die Auswahl von Werkstoffen angesehen werden.

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Section: Dma-analysismentioning

confidence: 74%

Developing a roadmap of the modified PTFEs - characterization of a high-performance material

Tebbe¹

2016

Zeitschrift Kunststofftechnik

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“…The latter can be formed directly during the plasma treatment by using extra oxygen atoms ripped from the material itself or from leftover humidity or air retained in the fibers. Another explanation for the carboxyl groups is the formation of acyl fluoride groups (FCO) during treatment, which readily react with humidity upon contact with atmosphere, forming hydroxyl groups, as described by Ebnesajjad . The appearance of a peak at 529.2 eV, which is usually associated with metallic oxides, is not clearly understood.…”

Section: Resultsmentioning

confidence: 99%

Effects of different plasma treatments of short fibers on the mechanical properties of polypropylene‐wood composites

et al. 2016

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In this work, a custom‐made reactor was developed to treat batches of short wood fibers with plasma. Three different plasma gases were tested: air, methane (CH4) and sulfur hexafluoride (SF6). The latter showed very promising results and was therefore used to prepare additional samples to determine the effects of plasma treatment and conditions on the wood fiber surface properties as well as the adhesion in a polypropylene matrix. As a result, composites made out of fibers plasma treated for 40 min at 60 W demonstrated an increase in the elastic modulus of more than 25%. Scanning electron microscope micrographs of the composites’ fracture surfaces indicated stronger interactions between treated fibers and the matrix. The incorporation of fluorine on treated fiber surfaces, mostly in covalent bonds with carbon, was clearly observed and analyzed by X‐ray photoelectron spectroscopy. The water contact angle on wood specimens treated under similar conditions displayed hydrophobic to superhydrophobic behavior, with contact angles exceeding 130°. POLYM. COMPOS., 39:1468–1479, 2018. © 2016 Society of Plastics Engineers

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“…Polytetrafluoroethylene (PTFE) is a fluoropolymer with many outstanding properties including excellent thermal stability, chemical inertness and very low coefficient of friction, making it suitable for a wide range of applications …”

Section: Introductionmentioning

confidence: 99%

“…Conventional melt processing techniques such as extrusion and injection molding cannot be applied to Ultra‐High Molecular Weight PTFE resulting from its very high melt viscosity (10 10 −10 11 poise) . Industrially, PTFE is processed by semi‐continuous melt extrusion or compaction (pre‐forming) of PTFE molding powder at room temperature followed by sintering .…”

Section: Introductionmentioning

confidence: 99%

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Mechanism and kinetics of ultra‐high molecular weight polytetrafluoroethylene sintering

Ganguly

Lesser

2014

J of Applied Polymer Sci

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The effect of sintering time on the melt evolution of Ultra‐High Molecular Weight Polytetrafluoroethylene was studied in situ by high temperature Wide Angle X‐ray Scattering, and by cyclic thermal loading profiles within a Differential Scanning Calorimeter (DSC) and Thermo‐Mechanical Analyzer (TMA). Results obtained from these techniques support the concept of molecular ordering in the melt state as a function of sintering time well above the melting temperature. TMA, which is not a conventional technique for monitoring thermal transitions, is shown to be sensitive enough for such purposes. Both DSC and TMA exhibit nonequilibrium melt behavior even 30°C above its equilibrium melting temperature for long time periods. A correlation between the DSC and TMA results is established. The cyclic thermal profile leads to a dramatic growth in enthalpy of crystallization/melting. The mechanism for this growth is associated with two independent processes; isothermal annealing at the sintering temperature and lamellar thickening in the solid state. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40967.

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Preface

Cited by 13 publications

References 0 publications

Developing a roadmap of the modified PTFEs - characterization of a high-performance material

Developing a roadmap of the modified PTFEs - characterization of a high-performance material

Effects of different plasma treatments of short fibers on the mechanical properties of polypropylene‐wood composites

Mechanism and kinetics of ultra‐high molecular weight polytetrafluoroethylene sintering

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