Article

Chemoenzymatic synthesis of Y-shaped diblock copolymer

Polymer Bulletin (impact factor: 1.53). 04/2012; 62(5):643-655. DOI:10.1007/s00289-009-0050-2

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).

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Keywords

ATRP
 
catalyst system
 
controlled/‘living’ radical polymerization
 
differential scanning calorimetry
 
enzymatic ring-opening polymerization
 
eROP
 
FTIR
 
PCL-b-(PSt)2 diblock copolymers
 
resulting PCL
 
styrene
 
thermal behavior
 
Y-shaped diblock copolymer polycaprolactone-block-(polystyrene)2 [PCL-b-(PSt)2]
 

Bao Zhang