The present invention encompasses polymer compositions comprising aliphatic polycarbonate chains containing sites of olefinic unsaturation. In certain embodiments the aliphatic polycarbonate chains comprise sites of olefinic unsaturation capable of participating in radical-promoted olefin polymerizations. In certain embodiments, the invention encompasses composites formed by the polymerization or cross-linking of a combination of olefinic monomers and aliphatic polycarbonate chains containing sites of olefinic unsaturation.
