Stock material or miscellaneous articles – Composite – Of fluorinated addition polymer from unsaturated monomers
Patent
1994-03-15
1997-10-21
Nakarani, D. S.
Stock material or miscellaneous articles
Composite
Of fluorinated addition polymer from unsaturated monomers
134 11, 216 50, 216 65, 216 66, 216 67, 428422, B29C 5916, B29C 5910, B32B 2730
Patent
active
056794606
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to the modifying of a fluorine-containing plastic, to the modified fluorine-containing plastic and to materials, particularly bio-materials, containing such a modified, fluorine-containing plastic, possibly as coating (plasmapolymers). The invention relates particularly to a method with which the surface of the fluorine-containing plastic can be made superhydrophobic, and according to a preferred embodiment the fluorine-containing plastic is modified such that a portion of the surface becomes superhydrophobic and another portion of the surface hydrophilic. In preference both types of surface are located on either side of a fluorine-containing plastic sheet.
Fluorine-containing plastics, such as polytetrafluoroethylene (PTFE) offer interesting technical applications because of the material properties such as a high thermal and chemical resistance and the hydrophobic nature of the surface. The materials seem very suitable as bio-material. PTFE is for example strong, flexible and bio-inert and can be made elastic and if necessary porous (e-PTFE). This hydrophobic material can be used as bio-material when a small adhesion to body tissues is required, for example at the lumen side of vascular prostheses, paradontological membranes and the visceral side of abdominal wall patches. If a good interaction with body tissue is necessary, as for instance on the dermal side of abdominal wall patches, the use of hydrophilic PTFE is preferred.
SUMMARY OF THE INVENTION
The invention has for its object to modify the surface of fluorine-containing plastics such that the applicability in industrial products and in bio-materials is thereby increased, particularly in that the hydrophobic character of the surface is greatly influenced. This is achieved according to the invention with a method for modifying at least a part of the surface of a fluorine-containing plastic, which method comprises making the surface hydrophobic by:
DESCRIPTION OF THE PREFERRED EMBODIMENTS
It has been found that due to the combined treatment consisting of ion-etching and glow discharging the hydrophobic character of the fluorine-containing plastic is greatly enlarged. If as a measure of the hydrophobic character the mean contact angle of water on the modified surface is used, the method according to the invention results in an increase of the average contact angle of 108.degree. to more than 125.degree., preferably more than 130.degree. and even to more than 140.degree.. It is noted that ion-etching alone results in a smaller increase in the hydrophobic character (mean contact angle of water approximately 120.degree.) and that glow discharging alone results in a lessening of the hydrophobic character (mean contact angle of water 100.degree.).
Ion-etching is a per se conventional treatment technique well known to a person skilled in the art.
The cleaning treatment which must be performed on the plastic surface treated by ion-etching after the ion-etching has for its object to remove from the plastic surface substances or structures generated on the plastic surface by the ion-etching. This cleaning treatment can comprise a chemical, physical and/or physical-chemical treatment of the plastic surface treated by ion-etching such as a treatment with acid, base, salts, solvents and/or combinations thereof, assuming that the effect according to the present invention is thereby not adversely affected to any great extent. A cleaning treatment preferred at this moment comprises glow discharging, which is a per se conventional treatment technique.
Suitable for use as fluorine-containing plastic in the modification method according to the invention are those plastics whose mechanical properties are such that the ion-etching and the glow discharging treatment, while optionally the plastic is cooled, does not result in a serious deterioration in the physical and chemical properties of the plastic. In general can be used fluorine- and fluorochlorine-containing plastics such as the polymers polyfluoroeth
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patent: 5437900 (1995-08-01), Kuzowski
H. Griesser, "Long Term Behaviour of Contact Angles on Modified Fluorocarbon Surfaces," Polym. Mater. Sci. Eng., vol. 62, 1990, pp. 872-875.
G. Picha, "Tissue Response to Peritoneal Implants," Chemical Abstracts, vol. 94, No. 18, 1980.
Busscher Hendrik Jan
Schakenraad Josephus Maria
Nakarani D. S.
Rijksuniversiteit Groningen
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