Electrospinning solution, polyvinyl alcohol nanofibers and ion-exchange membrane
An ion-exchange membrane is provided, and the fibers of the ion-exchange membrane are obtained by electrospinning. The electrospinning solution contains 100 parts by weight of polyvinyl alcohol (PVA), 10-100 parts by weight of a modifier, 10-100 parts by weight of an ion exchanger, and 100-2,500 parts by weight of water. The modifier has a reactive group that can react with the hydroxyl groups of the PVA. The ion exchanger has a polar functional group that can form hydrogen bonds with the hydroxyl groups of the PVA, and has an anion group that can provide ion-exchange ability.
1. An electrospinning solution, a composition of the electrospinning solution comprising:
100 parts by weight of polyvinyl alcohol (PVA);
10-100 parts by weight of a modifier having a reactive group that can react with hydroxyl groups of the PVA at a temperature of 100-200° C.;
10-100 parts by weight of an ion exchanger having a polar functional group and an anion group, wherein the polar functional group is —OH, —NH 2 , —COOH, —CHO, —F or any combinations thereof; and
100-2,500 parts by weight of water.
2. The electrospinning solution of claim 1 , wherein a weight average molecular weight of PVA is from about 15,000 to about 120,000.
3. The electrospinning solution of claim 1 , wherein the reactive group of the modifier comprises an isocyanate (—NCO) group, a carboxylate group (—COO − ), or a nitro group (—NO 2 − ).
4. The electrospinning solution of claim 1 , wherein the modifier is
and R 1 is
5. The electrospinning solution of claim 1 , wherein the anion group of the ion exchanger is —SO 3 , —COO − , or —NO 2 − .
6. The electrospinning solution of claim 1 , wherein the ion exchanger is 5-sodium sulfoisophthalate (5-SSIPA), sodium dimethyl 5-sulphonatoisophthalate (SIPM), dimethyl 5-sulfoisophthalate sodium salt hydrate (SIPE), trisodium 2-hydroxy-1,2,3-propanetricarboxylate (i.e. sodium citrate), dipotassium ethylenediamine tetraacetate, sodium tartrate, sodium alginate, or sodium nitrite.
7. Nanofibers of polyvinyl alcohol electrospun by an electrospinning solution, a composition of the electrospinning solution comprising:
100 parts by weight of polyvinyl alcohol (PVA);
10-100 parts by weight of a modifier having a reactive group that can react with hydroxyl groups of the PVA at a temperature of 100-200° C.;
10-100 parts by weight of an ion exchanger having a polar functional group and an anion group, wherein the polar functional group is —OH, —NH 2 , —COOH, —CHO, —F or any combinations thereof; and
100-2,500 parts by weight of water.
8. The nanofibers of claim 7 , wherein a weight average molecular weight of the PVA is from about 15,000 to about 120,000.
9. The nanofibers of claim 7 , wherein the reactive group of the modifier comprises an isocyanate (—NCO) group, a carboxylate group (—COO − ), or a nitro group (—NO 2 − ).
10. The nanofibers of claim 7 , wherein the anion group of the ion exchanger is —SO 3 , —COO − , or —NO 2 − .
11. The nanofibers of claim 7 , wherein a diameter of the nanofibers is from about 50 nm to about 300 nm.
12. An ion-exchange membrane comprising nanofibers of polyvinyl alcohol, wherein the nanofibers of polyvinyl alcohol are electrospun by an electrospinning solution, and a composition of the electrospinning solution comprising:
100 parts by weight of polyvinyl alcohol (PVA);
10-100 parts by weight of a modifier having a reactive group that can react with hydroxyl groups of the PVA at a temperature of 100-200° C.;
10-100 parts by weight of an ion exchanger having a polar functional group and an anion group, wherein the polar functional group is —OH, —NH 2 , —COOH, —CHO, —F or any combinations thereof; and
100-2,500 parts by weight of water.
13. The ion-exchange membrane of claim 12 , wherein a weight average molecular weight of the PVA is from about 15,000 to about 120,000.
14. The ion-exchange membrane of claim 12 , wherein the reactive group of the modifier comprises an isocyanate (—NCO) group, a carboxylate group (—COO − ), or a nitro group (—NO 2 − ).
15. The ion-exchange membrane of claim 12 , wherein the anion group of the ion exchanger is —SO 3 − , —COO − , or —NO 2 − .