2.4. Size Exclusion Chromatography (SEC) Procedure

5 mg of polymer was dissolved in 1.5 mL THF with 0.025% butylated hydroxy toluene (BHT). Two drops of toluene were added as a flow rate marker. The solution was then filtered through a 0.22 μm filter. Size exclusion chromatography was performed using an Agilent 1260 gel permeation chromatography system coupled with an autosampler, a guard and 2× PL Gel Mixed B columns, and a refractive index detector. The eluent was tetrahydrofuran running at 1 mL/min at 25 °C. The system was calibrated with poly(methyl methacrylate) standards in the range of 617,000 to 1010 and corrected to polystyrene using the standard Mark-Houwink parameters K_MMA = 12.8, α_MMA = 0.69, K_Sty = 11.4, α_Sty = 0.716. The M_n by GPC, after applying the Mark-Houwink correction for polystyrene was 7.0kDa, M_w of 9.8kDa, with a polydispersity of 1.40. The molecular weight distribution data on the polymer are also included in the supporting information in Figure S2.