Multilayered composite structure with electrospun layer
In accordance with certain embodiments of the present disclosure, a process for forming a multilayered electrospun composite is provided. The process includes forming a dispersion of polymeric particles, a fiberizing polymer, and a solvent, the dispersion having a viscosity of at least about 50,000 cPs. Nanofibers from the dispersion are electrospun onto a first ePTFE layer. A second ePTFE layer is applied onto the nanofibers to form a composite structure. The composite structure is heated.
1. A process for forming a multilayered electrospun composite structure comprising:
forming a dispersion of polymeric particles, a fiberizing polymer, and a solvent, the dispersion having a viscosity of at least about 50,000 cPs;
electrospinning nanofibers from the dispersion onto a first expanded polytetrafluoroethylene layer;
applying a second expanded polytetrafluoroethylene layer onto the nanofibers to form a composite structure; and heating the composite structure.
2. The process of claim 1 , wherein the polymeric particles comprise polytetrafluoroethylene.
3. The process of claim 2 , wherein the dispersion comprises about 50-80 weight percent of polytetrafluoroethylene.
4. The process of claim 2 , wherein the dispersion comprises about 59-61 weight percent of polytetrafluoroethylene.
5. The process of claim 1 , wherein the solvent comprises water.
6. The process of claim 1 , wherein the fiberizing polymer comprises polyethylene oxide.
7. The process of claim 1 , wherein the fiberizing polymer comprises a polyacrylamide, polyvinyl alcohol, polyvinylpyrrolidone, dextran, alginate, chitosan, guar gum compound, starch, cellulosic compound, polyacrylate, polycarboxylate, polylactic acid, polymethacrylic acid, or combinations thereof.
8. The process of claim 1 , wherein the dispersion has a viscosity of at least about 100,000 cPs.
9. A process for forming a multilayered electrospun composite structure comprising:
electrospinning a dispersion having a viscosity of at least about 50,000 cPs and comprising polymeric particles, a fiberizing polymer, and a solvent, onto a first side of an expanded polytetrafluoroethylene layer;
electrospinning a dispersion having a viscosity of at least about 50,000 cPs and comprising polymeric particles, a fiberizing polymer, and a solvent, onto a second side of the expanded polytetrafluoroethylene layer to form a composite structure; and
heating the composite structure.
10. The process of claim 9 , wherein at least a portion of the polymeric particles comprise polytetrafluoroethylene.
11. The process of claim 9 , wherein the dispersion comprises about 59-61 weight percent of polytetrafluoroethylene.
12. The process of claim 9 , further comprising sintering.
13. The process of claim 9 , wherein the solvent comprises water.
14. A process for forming a multilayered electrospun composite structure comprising:
forming a dispersion of polymeric particles, a fiberizing polymer, and a solvent, the dispersion having a viscosity of at least about 50,000 cPs;
electrospinning nanofibers from the dispersion onto a first expanded polytetrafluoroethylene layer;
applying a substrate onto the nanofibers to form a composite structure; and
heating the composite structure.
15. The process of claim 14 , wherein the polymeric particles comprise polytetrafluoroethylene.
16. The process of claim 15 , wherein the dispersion comprises about 50-80 weight percent of polytetrafluoroethylene.
17. The process of claim 14 , wherein the substrate comprises woven or nonwoven fabric.
18. The process of claim 14 , wherein the substrate comprises a plastic or ceramic membrane.
19. The process of claim 14 , wherein the substrate comprises a metal, ceramic, or plastic mesh.
20. A process for forming a multilayered electrospun composite structure comprising:
electrostatically spinning nanofibers from a dispersion onto a first expanded polytetrafluoroethylene layer, wherein the dispersion comprises polymeric particles, a fiberizing polymer, and a solvent and wherein the dispersion has a viscosity of at least about 50,000 cPs;
applying a second expanded polytetrafluoroethylene layer onto the nanofibers to form a composite structure; and
heating the composite structure.
21. A process for forming a multilayered electrospun composite structure comprising:
electrostatically spinning nanofibers from a dispersion onto a first expanded polytetrafluoroethylene layer, wherein the dispersion comprises polymeric particles, a fiberizing polymer, and a solvent, and wherein the dispersion has a viscosity of at least about 50,000 cPs;
applying a substrate onto the nanofibers to form a composite structure; and
heating the composite structure.