Process of electrospinning organic-inorganic fibers
Organic-inorganic hybrid fibers and methods for the preparation of such fibers are disclosed.
1. A method of forming a composite fiber having an organic phase and an inorganic phase comprising:
electrospinning an electrically conductive solution of an organic polymer and an inorganic polymer or a precursor of the inorganic polymer in the presence of an electric field between a spinneret and a ground source to form the composite fiber wherein the organic and inorganic phases of the composite fiber have intermixed and reacted with one another, wherein the organic polymer comprises reactive silane groups and wherein the organic polymer and the inorganic polymer or the recursor of the inorganic polymer contain co-reactive functional groups that react with one another during electrospinning.
2. The method of claim 1 in which the fibers are collected on the ground source.
3. The method of claim 1 in which the fibers have a diameter up to 5000 nanometers.
4. The method of claim 2 in which the organic polymer is a (meth)acrylic polymer or copolymer.
5. The method of claim 2 in which the organic polymer containing silane groups also contains groups selected from carboxyl, hydroxyl and optionally nitrogen-containing groups.
6. The method of claim 1 , wherein the organic polymer comprises:
(a) 0.2 to 20 percent silane groups measured as silicon,
(b) 1 to 20 percent carboxyl groups,
(c) 0.5 to 6.5 percent hydroxyl groups, and
(d) 0.2 to 5.0 percent nitrogen.
7. The method of claim 1 , wherein the composite fiber comprises:
10 to 90 percent by weight organic polymer, and
10 to 90 percent by weight of inorganic polymer or a precursor of the inorganic polymer, the percentages by weight being based on total fiber weight.
8. The method of claim 1 , wherein the electrically conductive solution of the organic polymer and the inorganic polymer or the precursor of the inorganic polymer has a viscosity 1,000 centistokes or less prior to electrospinning.
9. The method of claim 1 , wherein the electrically conductive solution of the organic polymer and the inorganic polymer or the precursor of the inorganic polymer has a viscosity 250 centistokes or less prior to electrospinning.