Surface modified separation media
AssigneeApplied Membrane Technology, Inc.
InventorAshok Sharma
Life of this patent
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Abstract
A substrate surface may be modified with a polymer coating to render the surface suitable for plasma functionalization. The polymer coating is deposited onto the surface at ambient temperature to a thickness of less than 0.1 μm. The polymer coating includes poly(p-xylylene) or a derivative thereof, and is capable of penetrating into pores of a porous substrate while no substantially altering the porosity of the substrate. The coated substrate is selected from a material lacking a primary or secondary aliphatic hydrogen atom.
Claims15
A method for modifying a surface of a porous substrate, the method comprising:
- depositing a polymer coating onto the surface at ambient temperature to a thickness of less than 0.1 μm to form a coated porous substrate, wherein the polymer coating comprises poly (p-xylylene) or a derivative thereof, and wherein the polymer penetrates into pores of the porous substrate but does not substantially alter porosity of the porous substrate, wherein the porous substrate lacks a primary or secondary aliphatic hydrogen atom;
- and
- exposing the coated porous substrate to a plasma environment having a radio frequency (RF) power of less than or equal to 10 watts, and a monomer at a monomer flow rate of at least 40 standard cubic centimeters per minute (SCCM) to chemically bond a functional agent to the coated porous substrate.
A substrate, comprising:
- a porous body having first and second opposed surfaces and comprising a material lacking a primary or secondary aliphatic hydrogen atom;
- a polymer coating on at least one of the first and second surfaces, the polymer coating comprising poly (p-xylylene) or a derivative thereof and having a thickness of less than 0.1 μm;
- and
- a functional agent chemically bonded by a plasma treatment to the polymer coating, wherein the functional agent includes an atom of or a molecule containing nitrogen.
Dependencies are inferred from the claim text.