Performance properties and applications of polytetrafluoroethylene (PTFE)—a review

Dhanumalayan, E.; Joshi, Girish M.

doi:10.1007/s42114-018-0023-8

Cited by 266 publications

(113 citation statements)

References 121 publications

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“…In contrast, the system pressure gradually increased when using stainless steel and sand particles, probably due to the accumulation of polymeric material within the packed-bed. These results could be ascribed to the very low van-der-Waals forces characteristic of PTFE, which prevent materials to easily stick to its surface [40]. Moreover, this material is fully inert under most reaction conditions.…”

Section: Resultsmentioning

confidence: 99%

Enhanced mixing of biphasic liquid-liquid systems for the synthesis of gem-dihalocyclopropanes using packed bed reactors

2019

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A continuous flow procedure for the gem-dichlorocyclopropanation of alkenes has been developed. The method is based on the generation of dichlorocarbene utilizing the classical biphasic aqueous sodium hydroxide/chloroform system. This reaction typically requires vigorous stirring for several hours in batch for completion. Tarry materials precipitate due to partial polymerization of dichlorocarbene and the process is difficult to scale. To overcome these problems and achieve very efficient mixing during the flow process a column reactor packed with PTFE beads as inert filling material has been used. PTFE beads have been found to be the optimal material to obtain fine dispersions of the aqueous phase in the organic solution. By heating the packedbed reactor at 80°C excellent conversions have been achieved after a residence time of only 4 min. The process has been applied for the synthesis of Ciprofibrate, a dichlorocyclopropane-containing drug used as treatment for several diseases associated with high lipid content in blood.

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Section: Resultsmentioning

confidence: 99%

Enhanced mixing of biphasic liquid-liquid systems for the synthesis of gem-dihalocyclopropanes using packed bed reactors

2019

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“…Hence fluorine-based polymers are recognized as great value-added molecules owing to their versatile unique feature particularly low value of refractive index, cohesive energy, surface energy and relative permittivity, and high value of thermal resistance, high chemical stability, resistance against UV, concentrated mineral acids, alkalis, and aging [76][77][78]. The tradename of commercially available Fluoropolymers has been tabulated in Table 5.…”

Section: Selection Of the Coating Materialsmentioning

confidence: 99%

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

2019

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Galling is the surface phenomenon which involves adhesion of local contact points and creation of protrusions on the juxtaposition of surfaces owing to high friction, inappropriate tribological loading, starved lubrication and high contact pressure (~ 1000 kPa). All these factors result in severe plastic deformation varying from 8000 to 10,000 µε (ε-strain) and diffusion of materials into one another, which consequently results in fatigue wear, surface roughness, tribocorrosion and seizing up of critical parts. The aim of the review is to analyze and summarizes the issue of galling, concurrently it also deals with the novel and economical mitigation method i.e. use of fluorine based coatings e.g. PTFE, owing to their lowest friction coefficient from 0.02 to 0.2 among other solids, high stiffness, high thermal stability and non-adherent characteristics that augments the mechanical and tribological properties and concurrently protect against hostile environments that eventually upsurges the life of components.

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“…Electrospraying, otherwise called electro-hydrodynamic spraying or electro-hydrodynamic atomization or steady cone-jet mode, is known as a unique technology to produce novel materials including particles, films or coatings [12]. The fundamental mechanism is similar to electrospinning except for the final output.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Electrosprayed, Microporous Particle Filled Layers

et al. 2020

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Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer known for its excellent hydrophobic properties. In this work, samples from PTFE dispersions with different combinations of water and carbon microparticles were prepared using an electrospraying method. The morphologies and sizes of carbon particles were investigated and the properties of layers including roughness, hydrophobicity and electrical resistivity were investigated. The non-conductive carbon microparticles were selected as a model particle to check the compatibility and electrospraying ability, and it had no effect on the hydrophobic and electrical properties. Carbon microparticles in polymer solution increased the degree of ionization and was found to be beneficial for the shape control of materials. The results showed that PTFE dispersion with the composition of water and carbon microparticles produced fine sphere particles and the layer fabricated with increased roughness. It was also found that the electrical resistivity and hydrophobicity of all the layers comparatively increased. The fabricated microporous layers can be used in various applications like interlining layer in multilayer textile sandwiches.

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Performance properties and applications of polytetrafluoroethylene (PTFE)—a review

Cited by 266 publications

References 121 publications

Enhanced mixing of biphasic liquid-liquid systems for the synthesis of gem-dihalocyclopropanes using packed bed reactors

Enhanced mixing of biphasic liquid-liquid systems for the synthesis of gem-dihalocyclopropanes using packed bed reactors

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

Preparation of Electrosprayed, Microporous Particle Filled Layers

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