Polyurethane films and method of fabricating the same

Abstract

A polyurethane film. The polyurethane film includes a plurality of pores distributed from surface to interior. The invention also provides a method of fabricating the polyurethane film.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be more fully understood by reading the subsequent detailed description and examples with reference made to the accompanying drawings, wherein:

FIG. 1 is a SEM cross section of a related asymmetrically close-cell porous polyurethane film structure.

FIG. 2 is a SEM cross section of a symmetrical open-cell porous polyurethane film structure of the invention.

FIG. 3 shows contact angle of the polyurethane film of the invention.

Claims

1. A polyurethane film comprising a plurality of pores distributed from surface to interior.

2. The polyurethane film as claimed in claim 1, wherein the polyurethane is a kind of solvent-based polyurethane.

3. The polyurethane film as claimed in claim 1, wherein the pores have a diameter of about 0.1˜50 μm.

4. A method of fabricating a polyurethane film, comprising: coating a polyurethane solution on a substrate;immersing the substrate in a coagulation bath with at least one non-solvent to agglomerate a polyurethane film with pores distributed from surface to interior; andremoving residual solvent and non-solvent in the polyurethane film by a non-polar solvent.

5. The method of fabricating a polyurethane film as claimed in claim 4, wherein the polyurethane is a kind of solvent-based polyurethane.

6. The method of fabricating a polyurethane film as claimed in claim 4, wherein the coagulation bath with at least one non-solvent further comprises a solvent.

7. The method of fabricating a polyurethane film as claimed in claim 6, wherein the solvent and non-solvent have a ratio of about 1:99˜50:50.

8. The method of fabricating a polyurethane film as claimed in claim 4, wherein the non-solvent comprises water or glycerol.

9. The method of fabricating a polyurethane film as claimed in claim 6, wherein the solvent comprises N,N-dimethylformamide (DMF) or N,N-dimethylacetamide (DMAc).

10. The method of fabricating a polyurethane film as claimed in claim 4, wherein the non-polar solvent comprises n-hexane, methanol, or isopropanol.

11. The method of fabricating a polyurethane film as claimed in claim 4, wherein the fabrication is conducted at room temperature.

12. The method of fabricating a polyurethane film as claimed in claim 4, wherein the fabrication is a continuous process.

13. The method of fabricating a polyurethane film as claimed in claim 4, wherein the pores of the polyurethane film have a diameter of about 0.1˜50 μm.