Combined plasma and gamma radiation polymerization method for modifying surfaces
First Claim
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1. A method for modifying a surface of a hydrophobic material by a gamma-irradiation or electron beam irradiation induced polymerization thereon of one or a mixture of ethylenically unsaturated monomers so as to form a hydrophilic polymeric coating on said surface, the improvement comprising the steps of:
- a) exposing said surface to a glow discharge plasma (GDP) having a power from about 1 to about 500 W and for a time sufficient to induce grafting sites on said surface for the surface graft polymerization of steps b and c;
b) exposing said surface to a solution of an ethylenically unsaturated monomer or mixture thereof capable, via said ethylenic unsaturation, of gamma-irradiation or electron beam induced polymerization; and
c) irradiating said activated surface with gamma or electron beam radiation in the presence of said ethylenic unsaturated monomer or mixture thereof to thereby form a hydrophilic polymeric surface coating on said surface, said polymerization being initiated by said gamma or electron beam radiation wherein said polymerization is conducted under the following conditions;
i) monomer concentration in said solution in the range of from about 0.1% to about 50%, by weight;
ii) total gamma or electron beam dose in the range of from about 0.001 to less than about 0.50 Mrad; and
iii) gamma dose rate in the range of from about 10 to about 2500 rads/min, or electron beam dose rate in the range of from about 10 to about 108 rads/min.
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Abstract
A method for modifying the surface of a material by:
a. exposing the surface to a glow discharge plasma to activate the surface;
b. exposing the surface to an ethylenically unsaturated monomer or mixture of monomers; and
c. irradiating the activated surface with gamma radiation or electron beam radiation in the presence of the ethylenically unsaturated monomer to form a graft polymerized coating thereon.
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18 Claims
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1. A method for modifying a surface of a hydrophobic material by a gamma-irradiation or electron beam irradiation induced polymerization thereon of one or a mixture of ethylenically unsaturated monomers so as to form a hydrophilic polymeric coating on said surface, the improvement comprising the steps of:
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a) exposing said surface to a glow discharge plasma (GDP) having a power from about 1 to about 500 W and for a time sufficient to induce grafting sites on said surface for the surface graft polymerization of steps b and c; b) exposing said surface to a solution of an ethylenically unsaturated monomer or mixture thereof capable, via said ethylenic unsaturation, of gamma-irradiation or electron beam induced polymerization; and c) irradiating said activated surface with gamma or electron beam radiation in the presence of said ethylenic unsaturated monomer or mixture thereof to thereby form a hydrophilic polymeric surface coating on said surface, said polymerization being initiated by said gamma or electron beam radiation wherein said polymerization is conducted under the following conditions; i) monomer concentration in said solution in the range of from about 0.1% to about 50%, by weight; ii) total gamma or electron beam dose in the range of from about 0.001 to less than about 0.50 Mrad; and iii) gamma dose rate in the range of from about 10 to about 2500 rads/min, or electron beam dose rate in the range of from about 10 to about 108 rads/min. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification