Conditioning polytetrafluoroethylene surfaces for use in vascular prostheses

Miller, M. L.; Postal, R. H.; Sawyer, Philip N.; Martin, Juliette; Kaplit, M. J.

doi:10.1002/app.1970.070140201

Cited by 35 publications

(27 citation statements)

References 4 publications

(1 reference statement)

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“…The asymmetry of the C1s peak to higher binding energies also suggests the existence of CC double bonds and O bonded C species 54. This interpretation was also given in ref 1,102…”

Section: Resultssupporting

confidence: 77%

Formation of Plasma Polymer Layers with Functional Groups of Different Type and Density at Polymer Surfaces and their Interaction with Al Atoms

Friedrich

Kühn

Mix

et al. 2004

Plasma Processes & Polymers

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Summary: Monotype functionalizations with different types of functional groups (OH, NH2, COOH) on polypropylene and poly(tetrafluoroethylene) surfaces were synthesized using pulsed plasma‐initiated homo‐ or copolymerization of functional group‐carrying monomers. The maximum concentrations of functional groups were 31 OH, 18 NH2 or 24 COOH groups per 100 C atoms using allyl alcohol, allylamine or acrylic acid respectively as the monomer. The measured peel strengths of aluminium deposits increased linearly with the concentration of functional groups. Near the maximum concentration of OH (>27 OH/100 C atoms) or at moderate concentrations of COOH groups (>10 COOH/100 C atoms), constant (maximum) peel strengths were measured due to the mechanical collapse of one component in the composite (cohesive failure). Interface failures in Al‐PP composites were found with COOH, NH2 and OH groups and cohesive failures were seen when higher concentrations of COOH groups were applied (>10 COOH/100 C atoms).

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“…The asymmetry of the C1s peak to higher binding energies also suggests the existence of CC double bonds and O bonded C species 54. This interpretation was also given in ref 1,102…”

Section: Resultssupporting

confidence: 77%

Formation of Plasma Polymer Layers with Functional Groups of Different Type and Density at Polymer Surfaces and their Interaction with Al Atoms

Friedrich

Kühn

Mix

et al. 2004

Plasma Processes & Polymers

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show abstract

“…Redox mediator: 1, 2,4′-dipyridyl; 2, phenanthridine; 3, 2,2′-dipyridyl; 4, 4-phenylpyridine; 5, benzonitrile. Symbols: experimental chronoamperograms; lines: best fit of the chronoamperograms according to (25). is potential dependent.…”

Section: Short-time Behavior Nucleation Of the Ptfe Transformationmentioning

confidence: 99%

Surface Modification of Halogenated Polymers. 8. Local Reduction of Poly(tetrafluoroethylene) by the Scanning Electrochemical Microscope − Transient Investigation

Combellas¹,

Kanoufi²,

Mazouzi³

2004

J. Phys. Chem. B

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Local reduction of poly(tetrafluoroethylene) (PTFE) was achieved by scanning electrochemical microscopy (SECM). The PTFE reduction process was analyzed by the current transients, which helped propose general trends for PTFE microfabrication. The SECM was used to investigate quantitatively the kinetics of PTFE phase transformation. In a short time, a nucleation process accounts for the PTFE reduction evolution. The nucleation rate follows a potential dependency similar to that observed for conducting polymer growth or metal deposition. At long time, the expansion of the PTFE carbonization proceeds in a hemi-ellipsoidal fashion, the radial expansion being much easier than the in-depth one. Those expansions can be correlated to the tip current when changing reduction time, reducing species concentration, nature of the electrolytic solution, SECM tip radius, and tip-substrate separation. The stoichiometry of the reduction was estimated, and the existence of two kinetic regimes owing to the redox mediator reduction potential was evidenced, which confirmed previous results by feedback experiments. A rough model was proposed in which the reduction along the in-depth direction is mainly controlled by a diffusive process while the material resistivity controls the radial expansion. The observed variations may be explained by penetration of the reducing species into the rough reduced PTFE material.

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“…UV irradiation [ 1 , 2 , 3 ], electron beam (EB) irradiation [ 4 , 5 ], and synchrotron irradiation [ 6 ] have been used to improve the adhesion properties of PTFE; however, these methods concern a deep modification depth and thus were excluded from the present study. Although various surface modification methods for polymers such as corrosive solution immersion treatment [ 7 ], plasma treatment [ 8 , 9 , 10 , 11 ], and ion irradiation [ 12 , 13 , 14 ] have been developed, the most effective methods for PTFE modification include Na-containing solution immersion treatment (Na treatment) [ 15 , 16 , 17 ], surface graft polymerization after plasma treatment [ 18 , 19 , 20 ], surface graft polymerization during plasma treatment [ 21 , 22 , 23 ], and heat-assisted plasma (HAP) treatment [ 24 ]. Conventional plasma treatments have given a low effect of improvement in the adhesion property for PTFE [ 8 , 9 , 10 , 11 ]; however, Ohkubo et al found that heating during plasma treatment positively affected the adhesion property of PTFE.…”

Section: Introductionmentioning

confidence: 99%

Effects of He and Ar Heat-Assisted Plasma Treatments on the Adhesion Properties of Polytetrafluoroethylene (PTFE)

et al. 2021

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Heat-assisted plasma (HAP) treatment using He gas is known to improve the adhesive-bonding and adhesive-free adhesion properties of polytetrafluoroethylene (PTFE). In this study, we investigated the effects of He and Ar gaseous species on the HAP-treated PTFE surface. Epoxy (EP) adhesive-coated stainless steel (SUS304) and isobutylene–isoprene rubber (IIR) were used as adherents for the evaluation of the adhesive-bonding and adhesive-free adhesion properties of PTFE. In the case of adhesive bonding, the PTFE/EP-adhesive/SUS304 adhesion strength of the Ar-HAP-treated PTFE was the same as that of the He-HAP-treated PTFE. In the case of adhesive-free adhesion, the PTFE/IIR adhesion strength of the Ar-HAP-treated PTFE was seven times lower than that of the He-HAP-treated PTFE. The relation among gaseous species used in HAP treatment, adhesion properties, peroxy radical density ratio, surface chemical composition, surface modification depth, surface morphology, surface hardness, and the effect of irradiation with vacuum ultraviolet (VUV) and UV photons were investigated. The different adhesive-free adhesion properties obtained by the two treatments resulted from the changes in surface chemical composition, especially the ratios of oxygen-containing functional groups and C–C crosslinks.

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Conditioning polytetrafluoroethylene surfaces for use in vascular prostheses

Cited by 35 publications

References 4 publications

Formation of Plasma Polymer Layers with Functional Groups of Different Type and Density at Polymer Surfaces and their Interaction with Al Atoms

Formation of Plasma Polymer Layers with Functional Groups of Different Type and Density at Polymer Surfaces and their Interaction with Al Atoms

Surface Modification of Halogenated Polymers. 8. Local Reduction of Poly(tetrafluoroethylene) by the Scanning Electrochemical Microscope − Transient Investigation

Effects of He and Ar Heat-Assisted Plasma Treatments on the Adhesion Properties of Polytetrafluoroethylene (PTFE)

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