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6614675 
Journal Article 
Block and star block copolymers by mechanism transformation. 7. Synthesis of polytetrahydrofuran/poly(1,3-dioxepane)/polystyrene ABC miktoarm star copolymers by combination of CROP and ATRP 
Feng, XS; Pan, CY; , 
2002 
1 
Macromolecules
ISSN: 0024-9297
EISSN: 1520-5835 
AMER CHEMICAL SOC 
WASHINGTON 
2084-2089 
WOS:000174441800017 
Polytetrahydrofuran (PTHF)/poly(1,3-dioxepane) (PDOP)/polystyrene (PSt) ABC miktoarm star copolymers were synthesized by combination of cationic ring-opening polymerization (CROP) and atom transfer radical polymerization. Two different functional groups, carboxylic acid and CHBr, were capped at one end of PTHF through the reaction of PTHF-OH with 2-bromosuccinic anhydride (BSA). After PTHF-OOCCHBrCH2COOH reacted with thionyl chloride, block copolymer PTHF-b-PDOP was synthesized by CROP of DOP at -30 to -35degreesC with PTHF-OOCCHBrCH2COCl and AgClO4 as catalyst. Finally, (PTHF) (PDOP)-Br was used to initiate the polymerization of St in the presence of CuBr and bipyridine at 110 degreesC, and ABC miktoarm star polymer, s-[(PTHF) (PDOP) (PSt)] was successfully prepared. The copolymers obtained were characterized by H-1 NMR and gel permeation chromatography measurements.