US Patent 10167854 Shape memory article with heat-generating microcapsule

A shape memory article comprises a shape memory material that transitions to a first shape from a second shape when a temperature of the shape memory material exceeds a threshold temperature. A plurality of microcapsules is in thermal contact with the shape memory material. Each microcapsule in the plurality of microcapsules has a first compartment, a second compartment, and an isolating structure separating the first and second compartments. The isolating structure is rupturable in response to a stimulus. The first compartments each contain a first component, and the second compartments each contain a second component that reacts with the first component to produce heat.