Chemoenzymatic synthesis of Y-shaped diblock copolymer
ABSTRACT Y-shaped diblock copolymer polycaprolactone-block-(polystyrene)2 [PCL-b-(PSt)2] was synthesized successfully by the combination of enzymatic ring-opening polymerization (eROP) and atom transfer radical
polymerization (ATRP). CH3O-terminated PCL was synthesized firstly by eROP of ε-caprolactone (ε-CL) in the presence of biocatalyst Novozyme 435 and
initiator CH3OH, subsequently the resulting PCL was converted to macroinitiator by the esterification of it with 2,2-dichloro acetyl chloride
(DCAC). PCL-b-(PSt)2 diblock copolymers were synthesized in an ATRP of the styrene with CuCl/2,2′-bipyridine as the catalyst system. The kinetic
analysis of ATRP indicated a controlled/‘living’ radical polymerization. The structure and composition of obtained polymers
were characterized with NMR, GPC and FTIR. The thermal behavior was characterized by differential scanning calorimetry (DSC).