Chemically stabilized ionomers containing inorganic fillers
AssigneeE. I. Du Pont de Nemours and Company
InventorMark Gerrit Roelofs
Life of this patent
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Abstract
Ionomeric polymers that are chemically stabilized and contain inorganic fillers are prepared, and show reduced degradation. The ionomers care useful in membranes and electrochemical cells.
Claims16
A composition comprising a chemically stabilized, fluorinated ionomer having an inorganic filler incorporated therein, wherein the inorganic filler is a metal oxide, metal hydroxide, metal phosphate, or mixture thereof, and wherein the ionomer has been fluorinated by subjecting it to a fluorinating agent until the ionomer contains less than 200 unstable groups per 1,000,000 carbon atoms, wherein fluoride ion release in a third cycle of a Fenton Test using an acid form of the composition is in the range of 0.4 to 0.5 mgF/g of a membrane incorporating the composition, wherein in each cycle of a Fenton Test 0.6 g of dried composition is soaked in a glass tube containing 0.0029 g of FeSO4.7H2O dissolved in 50 ml of 30% hydrogen peroxide and heated at 85° C. for 18 hours.
A membrane comprising a porous support having interconnecting pores, a chemically stabilized fluorinated ionomer, and an inorganic filler, wherein:
- the inorganic filler is from the group of metal oxides, metal hydroxides, metal phosphates, and mixtures thereof;
- the ionomer has been chemically stabilized by subjecting it to a fluorinating agent until it contains less than 200 unstable groups per 1,000,000 carbon atoms;
- and
- the inorganic filler is distributed throughout the ionomer forming a composition, and the composition is distributed throughout the pores of the porous support,
- wherein fluoride ion release in a third cycle of a Fenton Test of an acid form of the composition is in the range of 0.4 to 0.5 mgF/g of the membrane incorporating the composition.
Dependencies are inferred from the claim text.