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Synthesis of Well‐Defined Polybenzamide‐ block ‐Polystyrene by Combination of Chain‐Growth Condensation Polymerization and RAFT Polymerization
Author(s) -
Masukawa Tomohiro,
Yokoyama Akihiro,
Yokozawa Tsutomu
Publication year - 2009
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200900150
Subject(s) - chain transfer , reversible addition−fragmentation chain transfer polymerization , polymer chemistry , raft , living polymerization , polymerization , copolymer , living free radical polymerization , polystyrene , radical polymerization , materials science , dispersity , styrene , catalytic chain transfer , chain growth polymerization , chemistry , polymer , composite material
Well‐defined diblock copolymers composed of poly( N ‐octylbenzamide) and polystyrene were synthesized by reversible addition‐fragmentation chain transfer (RAFT) polymerization of styrene with a polyamide chain transfer agent (CTA) prepared via chain‐growth condensation polymerization. Synthesis of a dithioester‐type macro‐CTA possessing the polyamide segment as an activating group was unsatisfactory due to side reactions and incomplete introduction of the benzyl dithiocarbonyl unit. On the other hand, a dithiobenzoate‐CTA containing poly( N ‐octylbenzamide) as a radical leaving group was easily synthesized, and the RAFT polymerization of styrene with this CTA afforded poly( N ‐octylbenzamide)‐ block ‐polystyrene with controlled molecular weight and narrow polydispersity.