Porous/nanoporous PHT

Patent metadata

Field	Value
Publication number	US-9890248-B2
Application number	US-201414564650-A
Country	US
Kind code	B2
Filing date	Dec 9, 2014
Priority date	Oct 16, 2014
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

Methods of forming nanoporous materials are described herein that include forming a polymer network with a chemically removable portion. The chemically removable portion may be polycarbonate polymer that is removable on application of heat or exposure to a base, or a polyhexahydrotriazine (PHT) or polyhemiaminal (PHA) polymer that is removable on exposure to an acid. The method generally includes forming a reaction mixture comprising a formaldehyde, a solvent, a primary aromatic diamine, and a diamine having a primary amino group and a secondary amino group, the secondary amino group having a base-reactive substituent, and heating the reaction mixture to a temperature of between about 50 deg C. and about 150 deg C. to form a polymer. Removing any portion of the polymer results in formation of nanoscopic pores as polymer chains are decomposed, leaving pores in the polymer matrix.

First claim

What is claimed is:

1. A method of making a material, comprising:
forming a reaction mixture comprising a formaldehyde, a solvent, a primary aromatic diamine, and an amine having a primary amino group and a carbamate group, the carbamate group having a group degradable by a base; and
heating the reaction mixture to a temperature of between about 50 deg C. and about 150 deg C. to form a polymer.

2. The method of claim 1 , wherein the amine having the primary amino group and the carbamate group is formed by reacting a primary diamine with an alkylene carbonate.

3. The method of claim 1 , wherein the group degradable by a base is a polycarbonate or polyester oligomer.

4. The method of claim 1 , further comprising heating the polymer to a temperature between about 200 deg C. and about 300 deg C. to form a porous polymer.

5. The method of claim 1 , wherein the amine having the primary amino group and the carbamate group is a linear polymer or a star polymer.

6. The method of claim 4 , wherein heating the polymer to a temperature between about 200 deg C. and about 300 deg C. forms a volatile organic gas, and further comprising removing the volatile organic gas.

7. The method of claim 1 , further comprising exposing the polymer to a base.

8. The method of claim 7 , further comprising heating the polymer to a temperature between about 200 deg C. and about 300 deg C.

Assignees

• IBM

Inventors

• Boday Dylan J
• Garcia Jeannette M
• Hedrick James L
• Wojtecki Rudy J

Classifications

• C08J9/26

  by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out · CPC title

• C08J9/0085

  Use of fibrous compounding ingredients (C08J9/0076 takes precedence) · CPC title

• C08G73/0644 Primary

  Poly(1,3,5)triazines · CPC title

• C08G73/065

  Preparatory processes · CPC title

• C08J2379/04

  Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors · CPC title