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1. WO2007092437 - METHOD FOR INCREASING THE PERMEABILITY OF POLYMER FILM

Publication Number WO/2007/092437
Publication Date 16.08.2007
International Application No. PCT/US2007/003138
International Filing Date 07.02.2007
IPC
B01D 39/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
39Filtering material for liquid or gaseous fluids
B01D 71/28 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
71Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
06Organic material
28Polymers of vinyl aromatic compounds
CPC
B01D 2323/34
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2323Details relating to membrane preparation
34Use of radiation
B01D 2325/14
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2325Details relating to properties of membranes
14Membrane materials having negatively charged functional groups
B01D 67/009
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
67Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
0081After-treatment of organic or inorganic membranes
009with wave-energy, particle-radiation or plasma
B01D 67/0093
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
67Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
0081After-treatment of organic or inorganic membranes
0093Chemical modification
B01D 71/36
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
71Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
06Organic material
30Polyalkenyl halides
32containing fluorine atoms
36Polytetrafluoroethene
B01D 71/82
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
71Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
06Organic material
76Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74
82characterised by the presence of specified groups, e.g. introduced by chemical after-treatment
Applicants
  • UNIVERSITY OF SOUTH CAROLINA [US]/[US] (AllExceptUS)
  • DAVIS, Thomas, A. [US]/[US] (UsOnly)
  • RAST, Walker, M. [US]/[US] (UsOnly)
Inventors
  • DAVIS, Thomas, A.
  • RAST, Walker, M.
Agents
  • CASSIDY, Timothy, A.
Priority Data
60/765,91807.02.2006US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD FOR INCREASING THE PERMEABILITY OF POLYMER FILM
(FR) PROCÉDÉ D'AUGMENTATION DE LA PERMÉABILITÉ D'UN FILM POLYMÈRE
Abstract
(EN)
Polymer membranes are disclosed having increased permeability. The process of the present disclosure, for instance, can increase the ion permeability of membranes and/or the gas permeability of membranes. In one embodiment, for instance, a precursor polymer is subjected to energy in an amount sufficient to form damage tracks through the thickness of the polymer. The damage tracks are then oxidized to form free radical groups. The precursor polymer is then hydrolyzed causing ion groups to form that cluster along the damage tracks. In one embodiment, sulfonated tetrafluoroethylene-based copolymer ionomer membranes are formed that have increased conductivity. Other ionomer membranes that may be formed according to the present disclosure include copolymers of a vinyl hydrocarbon and a vinyl carboxylic acid.
(FR)
L'invention concerne des membranes polymères ayant une perméabilité accrue. Le procédé selon l'invention, par exemple, peut augmenter la perméabilité ionique des membranes et/ou le perméabilité gazeuse des membranes. Dans un mode de réalisation, par exemple un polymère précurseur est soumis à une quantité suffisante d'énergie pour former des traces de dégradation à travers l'épaisseur du polymère. Ensuite, les traces de dégradation sont oxydées pour former des groupes de radicaux libres. Le polymère précurseur est alors hydrolysé, ce qui amène des groupes d'ions à former ce cluster le long des traces de dégradation. Dans un mode de réalisation, on réalise des membranes ionomères copolymères à base de tétrafluoroéthylène sulfoné ayant une meilleure conductivité. D'autres membranes ionomères, pouvant être formées selon la présente invention, contiennent des copolymères hydrocarbure vinylique/acide carboxylique vinylique.
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