Fluoroplastics, vol. 1 - non-melt processible fluoroplastics - Book Review

Ebnesajjad, Sina

doi:10.1109/mei.2004.1318853

Cited by 15 publications

(30 citation statements)

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“…The inference from Fig. 3 that the highfriction, high-wear configurations manifest less adhesion than the low-friction configuration is consistent with what is known experimentally about the low shear strength of PTFE [43]. Fig.…”

Section: Effects Of Temperature Load and Sliding Directionsupporting

confidence: 86%

Effect of Temperature on the Friction and Wear of PTFE by Atomic-Level Simulation

et al. 2015

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The tribological behavior of oriented, selfmated poly(tetrafluoroethylene) (PTFE) sliding surfaces is examined as a function of temperature from 25 to 300 K. Three distinct sliding configurations are considered: sliding perpendicular to the chain alignment in both PTFE surfaces, sliding parallel to chain alignment in both PTFE surfaces and sliding parallel to the chain alignment on one surface but perpendicular to chain alignment on the other. Our simulations reveal a general trend of increasing friction coefficient with decreasing temperature for configurations where the chains are aligned in the direction of sliding or crossed. However, for conditions where the chains are aligned but the sliding motion is perpendicular to this alignment, gross deformation and athermal friction behaviors are observed. The atomic-level processes associated with these increases in friction at low temperatures are characterized.

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Section: Effects Of Temperature Load and Sliding Directionsupporting

confidence: 86%

Effect of Temperature on the Friction and Wear of PTFE by Atomic-Level Simulation

et al. 2015

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“…It can be concluded that the critical stress decreases with increasing fluorine content in polymers. The low adhesion and surface energy of fluorinecontaining materials might be responsible to their lower critical stress [35]. The second critical transition of ETFE occurs approximately at the shear rate of 1,170 s -1 , which agrees with the visible irregular melt fracture beginning based on appearance observation (see Table 1).…”

Section: Apparent Flow Curvesupporting

confidence: 81%

Melt rheological properties of ETFE: an attempt to illuminate the fluorine-substitution effect

Yuan

et al. 2012

Polym. Bull.

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Flow behaviors and rheological properties of ethylene tetrafluoroethylene alternating copolymer (ETFE) under high-shear conditions were first reported. Flow instabilities, shear and extensional viscosities, and die swell of ETFE were investigated. Rheological behaviors of perfluorinated ethylene propylene copolymers (FEP), partially fluorinated ETFE, and non-fluorinated polyethylenes (PE) were compared for understanding the role of fluorine incursion on materials properties. It is found that (1) ETFE does not have sharkskin region or second smooth region which frequently occurs in FEP and linear PE; (2) critical shear stresses at which surface melt fracture occurs for the three polymers follow the order: FEP \ ETFE \ PE; (3) stable flow region narrows, die swell weakens, and flow activation energy increases when fluorine content of polymer increases. After time-temperature superposition, shifted shear viscosity, extensional viscosity, and elastic data (die swell) present universal scaling characteristic and superpose well in term of the same shift factors.

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“…Certain materials in widespread biomedical application such as expanded polytetrafluororethylene (ePTFE) are superhydrophobic as commercially prepared because of the inherent hydrophobicity of PTFE (advancing water contact angle of about 114 °)[33] and a fibrillated texture introduced by biaxial stretching (see Figure 1.). [34, 35] For example, we observe an advancing contact angle of about 138° on the ePTFE used in this work. The blood compatibility of ePTFE vascular grafts[36, 37] has stimulated interest in understanding, and improving upon, biocompatibility of the general class of superhydrophobic materials.…”

Section: 0 Introductionmentioning

confidence: 66%

Superhydrophobic effect on the adsorption of human serum albumin

et al. 2009

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Analytical protocol greatly influences measurement of human-serum albumin (HSA) adsorption to commercial expanded polytetrafluororethylene (ePTFE) exhibiting superhydrophobic wetting properties. Degassing of buffer solutions and evacuation of ePTFE adsorbent to remove trapped air immediately prior to contact with protein solutions are shown to be essential. Results obtained with ePTFE as a prototypical superhydrophobic test material suggest that vacuum degassing should be applied in the measurement of protein adsorption to any surface exhibiting superhydrophobicity. Solution depletion quantified using radiometry (I-125 labeled HSA) or electrophoresis yield different measures of adsorption, with nearly four-fold higher surface concentrations of unlabeled HSA measured by the electrophoresis method. This outcome is attributed to the influence of the radiolabel on HSA hydrophilicity which decreases radiolabeled-HSA affinity for a hydrophobic adsorbent in comparison to unlabeled HSA. These results indicate that radiometry underestimates the actual amount of protein adsorbed to a particular material. Removal of radiolabeled HSA adsorbed to ePTFE by 3X serial buffer rinses also shows that the remaining “bound fraction” was about 35% lower than the amount measured by radiometric depletion. This observation implies that measurement of protein bound after surface rinsing significantly underestimates the actual amount of protein concentrated by adsorption into the surface region of a protein-contacting material.

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Fluoroplastics, vol. 1 - non-melt processible fluoroplastics - Book Review

Cited by 15 publications

References 0 publications

Effect of Temperature on the Friction and Wear of PTFE by Atomic-Level Simulation

Effect of Temperature on the Friction and Wear of PTFE by Atomic-Level Simulation

Melt rheological properties of ETFE: an attempt to illuminate the fluorine-substitution effect

Superhydrophobic effect on the adsorption of human serum albumin

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