behavior might arise from the different solubility and crystallinity of the aromatic
polyether segments in star copolymers, compared to those of the corresponding
linear diblock copolymer.
As an arm-first method, macromonomers (MM) with the styryl terminal moiety
were synthesized by CGCP of 3-(alkylamino)benzoic acid esters 25 in the presence
of phenyl 4-vinylbenzoate as an initiator, and copolymerization with N,N’methylenebisacrylamide (MBAA) as a divinyl monomer in the presence of
2,2’-azobis(isobutyronitrile) (AIBN) at 60
C yielded the corresponding star
polymers (Scheme 34) [75].
Scheme 33 Synthesis of (AB) 3 -type star block copolymer of polystyrene and polyether
Fig. 4 TEM images of CHCl 3 cast of (a) AB-type diblock copolymer, (b) AB 2 -type mikto-arm
star copolymer, (c) A 2 B-type mikto-arm star copolymer, and (d) (AB) 3 -type star block copolymer.
The samples were stained with RuO 4 prior to TEM measurement
Chain-Growth Condensation Polymerization for Controlled Synthesis of Polymers
217
polyether segments in star copolymers, compared to those of the corresponding
linear diblock copolymer.
As an arm-first method, macromonomers (MM) with the styryl terminal moiety
were synthesized by CGCP of 3-(alkylamino)benzoic acid esters 25 in the presence
of phenyl 4-vinylbenzoate as an initiator, and copolymerization with N,N’methylenebisacrylamide (MBAA) as a divinyl monomer in the presence of
2,2’-azobis(isobutyronitrile) (AIBN) at 60
C yielded the corresponding star
polymers (Scheme 34) [75].
Scheme 33 Synthesis of (AB) 3 -type star block copolymer of polystyrene and polyether
Fig. 4 TEM images of CHCl 3 cast of (a) AB-type diblock copolymer, (b) AB 2 -type mikto-arm
star copolymer, (c) A 2 B-type mikto-arm star copolymer, and (d) (AB) 3 -type star block copolymer.
The samples were stained with RuO 4 prior to TEM measurement
Chain-Growth Condensation Polymerization for Controlled Synthesis of Polymers
217