New high-molecular-weight poly(ester-carbonates) by chain extension of poly(lactic-glycolic acid)

Poly(ester-carbonate)s [(OCHRCO) m O-R'-OCO] n (R= H and Me in a 1:1 mole ratio; R'= (CH 2 CH 2 O) 2 CH 2 CH 2 , (CH 2 ) 6 , CH 2 C(Me) 2 CH 2 ) are synthesized by polycondensation of oligo(lactic acid-co-glycolic acid) with α,ω-bischloroformates