Tailorable surface topology for antifouling coatings

Patent metadata

Field	Value
Publication number	US-10752787-B2
Application number	US-201916675754-A
Country	US
Kind code	B2
Filing date	Nov 6, 2019
Priority date	Aug 8, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

Embodiments are directed to a method of making an antifouling and bactericidal coating with tailorable surface topology. The method includes depositing a layer of branched polyethyleneimine (BPEI) and diamino-functionalized poly(propylene oxide) (PPO) in a mixture of water and organic solvent on a substrate to form a layer of BPEI/PPO. The method includes depositing a layer of glyoxal in a water-containing solution on the layer of BPEI/PPO. The method further includes curing the layer of BPEI/PPO and layer of glyoxal to form a homogenous, glyoxal crosslinked BPEI/PPO coating, where the curing induces local precipitation and alteration of the glyoxal crosslinked BPEI/PPO coating to provide a textured surface.

First claim

What is claimed is:

1. A method of making an antifouling coating with tailorable surface topology, the method comprising:
providing a mold with a pattern of indentions and protrusions;
forming a layer of fluorinated poly(thioaminal) polymer on the pattern of indentions and protrusions of the mold;
heating the layer of fluorinated poly(thioaminal) polymer to induce crosslinking and transfer the pattern into the layer of fluorinated poly(thioaminal) polymer; and
removing the mold from the layer of fluorinated poly(thioaminal) polymer, the layer of fluorinated polythioaminal comprising a negative pattern of the mold.

2. The method of claim 1 , wherein the layer of fluorinated poly(thioaminal) polymer is linear before heating.

3. The method of claim 1 , wherein a polydispersity index (PDI) of the fluorinated poly(thioaminal) polymer before heating is about 2.

4. The method of claim 1 , wherein forming the layer of fluorinated poly(thioaminal) polymer is by spin-coating.

5. The method of claim 1 further comprising forming the fluorinated poly(thioaminal) polymer by reacting a fluorinated dianiline and dithiol with paraformaldehyde.

6. The method of claim 5 , wherein reacting the fluorinated dianiline and dithiol with paraformaldehyde in-situ forms an intermediate imine that reacts with the dithiol.

7. The method of claim 1 , heating is at a temperature in a range from about 100 to about 200° C.

8. A method of making an antifouling coating with a textured surface, the method comprising:
forming a fluorinated poly(thioether) polymer by a nucleophilic aromatic substitution reaction; and
curing the fluorinated poly(thioether) polymer to provide a film that is semi-crystalline.

9. The method of claim 8 , wherein the nucleophilic substitution reaction comprises a perfluoroarene reactant.

10. The method of claim 8 , wherein the nucleophilic substitution reaction further comprises a dithiol.

11. The method of claim 9 , where the nucleophilic substitution reaction further comprises an organic catalyst.

12. The method of claim 11 , wherein the organic catalyst is triazabicyclodecene (TBD) or 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).

13. The method of claim 8 , where the film is opaque.

14. A method of making an antifouling coating with a textured surface, the method comprising:
forming a fluorinated poly(thioether) polymer by a nucleophilic aromatic substitution reaction; and
curing the fluorinated poly(thioether) polymer to provide a film that is crystalline.

15. The method of claim 14 , wherein the nucleophilic substitution reaction comprises a perfluoroarene reactant.

16. The method of claim 14 , wherein the nucleophilic substitution reaction further comprises a dithiol.

17. The method of claim 14 , where the nucleophilic substitution reaction further comprises an organic catalyst.

18. The method of claim 17 , wherein the organic catalyst is triazabicyclodecene (TBD) or 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).

19. The method of claim 14 , where the film is opaque.

20. The method of claim 14 , wherein the fluorinated poly(thioether) polymer in the film has a glass transition temperature (Tg) in a range of about 50 to about 200° C.

Assignees

• IBM
• Agency Science Tech & Res

Inventors

• Cahan Amos
• Ding Xin
• Fevre Mareva B
• Hedrick James L
• Liang zhen chang
• Park Nathaniel H
• Van Kessel Theodore G
• Wojtecki Rudy J
• Yang Yi Yan

Classifications

• B29K2995/0041

  Crystalline · CPC title

• B05D1/005

  Spin coating · CPC title

• A01N33/08

  containing oxygen or sulfur · CPC title

• C09D181/02

  Polythioethers; Polythioether-ethers · CPC title

• A01N25/10

  Macromolecular compounds · CPC title