R1, R2, and R3 are the same and are methyl, ethyl or propyl and R4 is phenyl. [0035] Illustrative examples of X and X1 (or X1 and X depending on how the RMC polymer is depicted) are [0036] respectively wherein: [0037] R5 and R6 are independently each hydrogen, alkyl, aryl, or heteroaryl; and Z is a photopolymerizable group. [0038] In preferred embodiments, R5 and R6 are independently each a C1-C10