Method for making a functionalized membrane
Assignee3M Innovative Properties Company
InventorsDouglas E. Weiss, Clinton P. Waller, JR., Derek J. Dehn, Jonathan F. Hester
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Abstract
The present disclosure describes functional membranes and a method for making a functional membrane. The method includes providing a porous substrate, applying the at least one graftable species to the porous substrate, and treating the coated porous substrate with electron beam radiation to provide a functionalized membrane. The method includes forming a functionalized membrane comprising a gradient of grafted species attached to the porous substrate.
Claims31
A method for making a functionalized membrane, the method comprising:
- providing a porous substrate having a first major surface, interstitial surfaces and a second major surface;
- applying at least one graftable species to the porous substrate to provide a coated porous substrate;
- and
- treating the coated porous substrate with electron beam radiation by changing a voltage and current level of an electron beam to deliver a gradient dose profile of the electron beam radiation through a cross-section of the porous substrate to provide the functionalized membrane, the electron beam radiation attaching the graftable species to the porous substrate in a gradient comprising grafted species covalently bonded to the porous substrate, so that a concentration of the grafted species is greater at the first major surface than at the second major surface.
A method for making a functionalized membrane, the method comprising:
- providing a porous substrate having a first major surface, interstitial surfaces and a second major surface;
- treating the porous substrate with electron beam radiation by changing a voltage and current level of the electron beam to deliver a gradient dose profile of the electron beam radiation through a cross-section of the porous substrate to provide an irradiated porous substrate comprising a gradient of initiating sites;
- and
- applying at least one graftable species to the irradiated porous substrate to provide a functionalized membrane, the graftable species attaching to the initiating sites on the porous substrate in a gradient comprising grafted species covalently bonded to the porous substrate so that a concentration of the grafted species is greater at the first major surface than at the second major surface.
Dependencies are inferred from the claim text.