Thermally robust capsule system, and composites including the capsules

US8951639B2 · kind B2 · utility

Assignee

• The Board of Trustees of the University of Illinois · US

Inventors

• Scott R. White · Champaign, US
• Jeffrey S. Moore · Savoy, US
• Nancy R. Sottos · Champaign, US
• Benjamin J. Blaiszik · Urbana, US
• Mary M. Caruso · Urbana, US
• Christian Mangun · Urbana, US

Key dates

• Filing date: Mar 16, 2012
• Grant date: Feb 10, 2015
• Expiry date: Nov 4, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2989
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method of making capsules includes forming a mixture including a core liquid, a polyurethane precursor system, a first component of a two-component poly(urea-formaldehyde) precursor system, and a solvent. The method further includes emulsifying the mixture, adding a second component of the two-component poly(urea-formaldehyde) precursor system to the emulsified mixture, and maintaining the emulsified mixture at a temperature and for a time sufficient to form a plurality of capsules that encapsulate at least a portion of the core liquid. The capsules made by the method may include a polymerizer in the capsules, where the capsules have an inner capsule wall including a polyurethane, and an outer capsule wall including a poly(urea-formaldehyde). The capsules may include in the solid polymer matrix of a composite material.