To determine the molecular mass distribution, molar mass and degree of polymerisation (DP) of the diblock copolymer, GPC was conducted (Agilent SECurity GPC system, Agilent Technologies UK Ltd., Shropshire, UK, with a Polymer Standard Service (PSS) SDV analytical linear M column). This system is equipped with a "1260 Iso" isocratic pump and an Agilent 1260 refractive index (RI) detector. The mobile phase was tetrahydrofuran (THF) with 5% vol trimethylamine (Et3N) (flow rate 1 ml/min) The added Et3N acts as a mild base to avoid DEAEMA absorption in the column. The column was calibrated using linear poly(methyl methacrylate) (PMMA) standard samples of MM 2000, 4000, 8000, 20,000, 50,000, and 100,000 g•mol -1 , (Sigma Aldrich Co Ltd., UK). The samples were prepared by mixing 10mg of polymer and 1 mL of GPC solvent (THF with 5% Et3N), and filtered before passing through the device to prevent blockage.