A composite material includes a polymer matrix, a polymerizer, and a
plurality of capsules containing a corresponding activator for the
polymerizer. The composite material can also include an adhesion
promoter, and the polymerizer can be phase separated from the polymer
matrix. The composite material can be made by dispersing the polymerizer
and capsules into the polymer matrix. These composite materials can
exhibit improved environmental stability, and can be used with a wider
variety of activators.