In the 1 H NMR for the block copolymer PS-PHEA, after integrating the peaks with reference to the aryl protons (a) from PS macro-RAFT, which is 450 protons per one block copolymer molecule, the integration for 2 protons from -CH2 group at (b), gives 28/2 = 14 PHEA monomer units per block copolymer chain. Hence, the PS-b-PHEA polymer is determined to have a block length of 90 of the PS block, and 14 for PHEA. This chain length is consistent with the obtained SEC results.