Polymer DP and the comonomer incorporation ratio were determined through 1 H NMR on a Bruker Avance 500 at 500 MHz in CDCl 3 (Figures S1-10) . The ratio of monomers was determined by integration of 1 H spectral resonances of the PEGMA/MEMA methoxy protons and the methanetriyl proton of the GMA glycidyl ring, normalized to the aromatic proton peak at the para position of the CPA phenyl ring, assuming there is one Z group on every polymer chain.