Table 1 Results of the polymerizations with various PCs

Polymerizations were carried out under the irradiation of 455 nm (50 mW cm^–2) for 24 h at r.t. following the general procedure with condition, [MMA]₀:[EBPA]₀:[PC]₀:[Cu(II)Br₂]₀:[TPMA]₀ = [200]:[1]:[x]:[0.002]:[0.009], MMA/DMF = 1/1 (v/v) where x = 1 x 10^–2, 2 x 10^–3, 2 x 10^–4, 2 x 10^–5 or 1 x 10^–5 (for 50 ppm, 10 ppm, 1 ppm, 0.1 ppm and 50 ppb relative to the monomer, respectively). Monomer conversion (α) was determined by integrals of ¹H NMR peaks. ^a,bReaction was performed under ^athe irradiation of 515 nm (50 mW cm^–2) and ^bundegassed conditions with 2 mL scale using into a 4 mL vial. ^cM_n,theo was determined by following relationship, M_n,theo = [MMA]₀/[EBPA]₀ × conversion × M_n,MMA + M_n,EBPA. ^dM_n,exp was measured by gel permeation chromatography (GPC) equipped with refractive index detector calibrated with PMMA standards. ^eInitiator efficiency (I^*) was determined by I^* = M_n,theo/M_n,exp. ^fDispersity (Đ) was determined by Đ = M_w,exp/M_n,exp.

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