Polymer films

• US 7,470,449 B2
• Filed: 05/24/2004
• Issued: 12/30/2008
• Est. Priority Date: 11/15/2000
• Status: Expired due to Fees

• Current Assignee: Board of Trustees of The University of Illinois
• Original Assignee: Board of Trustees of The University of Illinois
• Inventors: Granick, Steve, Sukhishvili, Svetlana A.
• Primary Examiner(s): LIGHTFOOT, ELENA TSOY
• Application Number:
  US10/852,090
• Publication Number:
  US 20040214002A1
• Time in Patent Office: 1,681 Days
• Field of Search: 427/212, 427/214, 427/352, 427/353
• US Class Current: 427/212
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/28 comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]
• CPC Class Codes: Y10T 428/31725 Of polyamide
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31942 Of aldehyde or ketone condensation product
• CPC Class Codes: Y10T 428/31971 Of carbohydrate

Abstract

A film contains a first polymer having a plurality of hydrogen bond donating moieties, and a second polymer having a plurality of hydrogen bond accepting moieties. The second polymer is hydrogen bonded to the first polymer.

Claims

1. A method of removing a film from a surface, comprising:

providing a film on a surface, the film comprising a first layer including a first polymer having a plurality of hydrogen bond donating moieties, and a second layer including a second polymer having a plurality of hydrogen bond accepting moieties; and

subjecting the film to an environmental change selected from a change in pH, a change in ionic strength, exposure to an electric field, or exposure to dissolved ions;

wherein said environmental change is of a sufficient magnitude to cause the film to be removed from the surface.

2. The method of claim 1, wherein at least one of said first polymer and said second polymer comprise a plurality of charge-forming groups.

3. The method of claim 2, wherein said charge-forming groups are selected from the group consisting of acids and bases.

4. The method of claim 2, wherein said hydrogen bond donating moieties are selected from the group consisting of O—

H, N—

H, P—

H and S—

H; and

wherein said hydrogen bond accepting moieties are selected from the group consisting of C═

O, O—

H, N—

H, C—

F, P═

O and C≡

N.

5. The method of claim 4, wherein said charge-forming groups are selected from the group consisting of acids and bases;

and wherein said first polymer or said second polymer comprises carboxylic acid groups.

6. The method of claim 2, wherein the subjecting provides for the formation of charge on at least a portion of the charge-forming groups.

7. The method of claim 6, wherein the subjecting further provides for a repulsive force between the first polymer and the second polymer.

8. The method of claim 1, wherein the film is in contact with a solvent, and the subjecting provides for an increase in the solubility of at least one of the first and second polymers in the solvent.

9. The method of claim 1, wherein the surface is on a particle.

10. A method of removing a film from a surface, comprising:

providing a film on a surface, the film comprising a first layer including a first polymer, and a second layer including a second polymer, the second polymer hydrogen bonded to the first polymer; and

subjecting the film to an environmental change selected from a change in pH, a change in ionic strength, exposure to an electric field, or exposure to dissolved ions;

wherein said environmental change is of a sufficient magnitude to cause the film to be removed from the surface.

11. The method of claim 10, wherein at least one of said first polymer and said second polymer comprise a plurality of charge-forming groups.

12. The method of claim 11, wherein said charge-forming groups are selected from the group consisting of acids and bases.

13. The method of claim 12, wherein said first polymer or said second polymer comprises carboxylic acid groups.

14. The method of claim 13, wherein said first polymer and said second polymer do not contain first and second oppositely charged groups, respectively.

15. The method of claim 11, wherein the subjecting provides for the formation of charge on at least a portion of the charge-forming groups.

16. The method of claim 15, wherein the subjecting further provides for a repulsive force between the first polymer and the second polymer.

17. The method of claim 10, wherein the film is in contact with a solvent, and the subjecting provides for an increase in the solubility of at least one of the first and second polymers in the solvent.

18. The method of claim 10, wherein the surface is on a particle.

19. A method of releasing an agent from a film into an environment, comprising:

providing a film comprising

a first layer including a first polymer having a plurality of hydrogen bond donating moieties,

a second layer including a second polymer having a plurality of hydrogen bond accepting moieties, and

an agent; and

subjecting the film to an environmental change selected from a change in pH, a change in ionic strength, exposure to an electric field, or exposure to dissolved ions;

wherein said environmental change is of a sufficient magnitude to cause the agent to be released from the film.

20. The method of claim 19, wherein the subjecting the film provides for removal of at least one of the first and second layers.

21. The method of claim 19, wherein at least one of said first polymer and said second polymer comprise a plurality of charge-forming groups, and the subjecting provides for the formation of charge on at least a portion of the charge-forming groups.

22. The method of claim 21, wherein the subjecting further provides for a repulsive force between the first polymer and the second polymer.

23. The method of claim 19, wherein the film is in contact with a solvent, and the subjecting provides for an increase in the solubility of at least one of the first and second polymers in the solvent.

24. The method of claim 19, wherein the film is on a surface.

25. The method of claim 24, wherein the surface is on a particle.

26. The method of claim 24, wherein the subjecting the film provides for removal of at least a portion of the film from the surface.

27. The method of claim 19, wherein the first polymer and the second polymer are held together through hydrogen bonds prior to the subjecting.

28. The method of claim 19, wherein the agent is present between the first and second layers.

29. The method of claim 19, wherein the agent is present in at least one of the first and second layers.

30. The method of claim 19, wherein the agent is selected from the group consisting of dyes, fragrances, perfumes, surfactants, detergents, chemicals used in environmental remediation, and bioactive agents.

31. The method of claim 19, wherein the agent comprises a bioactive agent selected from the group consisting of drug agents, medicaments, vitamins, nutrients, fertilizers, pesticides, proteins, peptides, genetic material, food supplements, spices, flavor enhancers, emollients, skin and hair conditioners, sex sterilants, fertility inhibitors and fertility promoters.

32. The method of claim 31, further comprising exposing the film to at least a portion of an organism prior to subjecting the film to an environmental change;

wherein the subjecting provides for delivery of the bioactive agent to the organism.

33. The method of claim 19, wherein the providing the film comprises contacting a surface with a solution of the first polymer;

and contacting the surface with a solution of the second polymer.

34. The method of claim 33, wherein at least one of the solution of the first polymer and the solution of the second polymer comprises the agent.

35. The method of claim 33, further comprising repeating the contacting the surface with the solution of the first polymer and contacting the surface with the solution of the second polymer at least once.

36. The method of claim 19, wherein the providing the film comprises contacting a surface with a solution of the first polymer;

contacting the surface with the agent; and

contacting the surface with a solution of the second polymer.

37. The method of claim 36, further comprising repeating the contacting the surface with the solution of the first polymer, contacting the surface with the agent, and contacting the surface with the solution of the second polymer at least once.