Polymer compositions and methods

A polymer composition comprising aliphatic polycarbonate chains having two or more sites of olefinic unsaturation, wherein

• a) each aliphatic polycarbonate chain comprises a repeating unit having a structure:
• where R1, R2, R3, and R4 are, at each occurrence in a polymer chain, independently selected from the group consisting of —H, fluorine, an optionally substituted C1-20 heteroaliphatic group, and an optionally substituted C1-30 aliphatic group, and an optionally substituted C6-10 aryl group, where any two or more of R1, R2, R3, and R4 may optionally be taken together with intervening atoms to form one or more optionally substituted rings optionally containing one or more heteroatoms;
• b) each aliphatic polycarbonate chain further comprises a repeating unit having a structure:
• where R1a, R2a, R3a, and R4a are, at each occurrence in a polymer chain, independently selected from the group consisting of —H, fluorine, an optionally substituted C1-20 aliphatic group, and -T-V, wherein for each unit of B, one or more of R1a, R2a, R3a, and R4a is -T-V;
• each T is independently a covalent bond or an optionally substituted bivalent C1-8 saturated or unsaturated, straight or branched, hydrocarbon chain, wherein one or more methylene units are optionally and independently replaced by —NR—, —N(R)C(O)—, —C(O)N(R)—, —N(R)SO2—, —SO2N(R)—, —O—, —C(O)—, —OC(O)—, —OC(O)O—, —C(O)O—, —N(R)C(O)O—, —OC(O)N(R)—, —S—, —SO—, or —SO2—;
• each R is independently —H, or an optionally substituted radical selected from the group consisting of C1-20 aliphatic, heterocyclic, carbocyclic, aryl, and heteroaryl;
• each V is an optionally substituted acyl, C1-12 aliphatic, C1-12 heteroaliphatic, aryl, heteroaryl, carbocylic, or heterocyclic group containing one or more units of olefinic unsaturation;
• c) the molecular weight of the aliphatic polycarbonate chains is on average in the range of about 500 g/mol to about 100,000 g/mol.