Results 101 to 110 of about 427,792 (144)

Etching and functionalization of a fluorocarbon polymer by UV laser treatment

Applied Surface Science, 1996
The most important modifications of PTFE surface composition are obtained when the polymer is irradiated with an excimer laser in O2: with XPS, we have shown the possibility to oxidize more than 2% of carbon species on the polymer surface; they might be proved suitable to improve compatibility with biological tissues.
Girardeaux, Christophe, Idrissi, Y., Pireaux, Jean-Jacques, Caudano, Roland   +3 more
openaire   +2 more sources

An infrared structural study of fluorocarbon polymers

Journal of Polymer Science Part A: General Papers, 1965
AbstractThe 3μ infrared spectra of copolymers of ethylene and 1,1‐difluoroethylene with chlorotrifluoroethylene have been investigated. By applying “dilute solution” techniques, models for head‐to‐head and head‐to‐tail polymers have been prepared and spectrally characterized.
openaire   +1 more source

Fluorocarbon-Modified Water Soluble Polymers

1994
Copolymers of acrylamide (AM) and perfluoroalkyl acrylates and -methacrylates were synthesized in aqueous media containing perfluoroalkyl carboxylates and acetone as surfactants and dispersing agents, respectively and persulfates as initiators. The copolymers, especially those with 2(N-ethylperfluoro octane sulfoamido) acrylate (RFA) as comonomers were
Y.-X. Zhang, F. S. Hwang, T. E. Hogen-Esch   +2 more
openaire   +1 more source

Collagen Synthesized in Fluorocarbon Polymer Implant in the Rabbit Cornea

Experimental Eye Research, 1996
The integration of microporous polymer into tissues is of great interest for the production of keratoprosthetic devices. Our previous studies showed functional differentiated cells and collagen synthesis in the pore of an expanded polytetrafluoroethylene implant. This study identifies and quantifies collagen types synthesized in the implant.
I, Drubaix, J M, Legeais, N, Malek-Chehire, M, Savoldelli, M, Ménasche, L, Robert, G, Renard, Y, Pouliquen   +7 more
openaire   +2 more sources

Relationship between the structure of polymers with well-defined fluorocarbon segmental lengths and the formation of secondary ions in SIMS

Surface and Interface Analysis, 2002
A series of fluorinated polymers were studied using time-of-flight secondary ion mass spectrometry (ToF-SIMS) to investigate the relationship between the structures of the polymers and secondary ions.
Li, Lin, Chan, Chi Ming, Weng, Lu Tao, Ng, Kai Mo, Zhou, Hui   +4 more
exaly   +2 more sources

The determination of sulphur in fluorocarbon polymers by neutron activation

Analytica Chimica Acta, 1969
Abstract Sulphur can be determined in fluorocarbon polymers and other fluorine compounds by neutron irradiation to convert sulphur-32 to phosphorus-32 by the (n,p) reaction. The phosphorus produced is determined by a substoichiometric extraction of vanadomolybdophosphoric acid, followed by measurement of β-emission. The method is satisfactory for sub-
R.B. Heslop, S.K. Tay
openaire   +1 more source

Hydrolytically stable fluorocarbon ether bibenzoxazole polymers

Journal of Polymer Science: Polymer Chemistry Edition, 1981
AbstractHydrolytically and thermooxidatively stable fluorocarbon ether bibenzoxazole (FEB) polymers were synthesized by the acetic acid‐promoted polycondensation of fluorocarbon ether bis(o‐aminophenol) monomers with novel fluorocarbon ether dithioimidate ester monomers.
Robert C. Evers, Tonson Abraham, Jerald L. Burkett   +2 more
openaire   +1 more source

Electrical conduction in thin polymer fluorocarbon films

Thin Solid Films, 1975
Abstract The current-voltage characteristics of thin polymer fluorocarbon films with thicknesses between 0.02 and 1.50 μm, deposited by different methods and with different contact materials, have been studied. Over the whole range of thickness and field strength investigated the measured characteristics can be described by a uniform conduction ...
W. Vollmann, H.-U. Poll
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Fluorocarbon bibenzoxazole polymers: Transitions and thermal stability

Journal of Applied Polymer Science, 1975
AbstractThe thermomechanical behavior (−180° to 500°C) in nitrogen is reported for two fluorocarbon bibenzoxazole homopolymers and a corresponding copolymer. The dynamic mechanical spectra were generated at low frequencies (∼1 Hz) by an adaptation of the torsional pendulum, torsional braid analysis (TBA), which uses polymer/glass braid composites as ...
C. K. Schoff, J. K. Gillham
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3He-19F interaction at the surface of fluorocarbon polymers

Journal of Low Temperature Physics, 1989
The interaction between19F nuclear spins in Teflon and3He spins on its surface has been studied in magnetic fields up to 6 Tesla. At temperatures below 1 K, a monolayer of3He is sufficient to increase the NMR relaxation rate of19F more than an order of magnitude over the value with vacuum or with a coverage of pure4He.
Geng, Q, Olsen, Malte, Rasmussen, Finn Berg   +2 more
openaire   +2 more sources