All reagents were used as received unless stated otherwise. Styrene was passed through a basic alumina (Al2O3) column before use. N, Ndimethylformamide (DMF) were dried using CaH2 and distilled. 2,2- Azoisobutyronitrile (AIBN) and D, L-lactide (LA) were purified by recrystallization from methanol and ethyl acetate, respectively. S-1- Dodecyl-S′-(α,α′-dimethyl-α″-acetic acid)trithiocarbonate (TC) was synthesized according to literature procedures [48].