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Synthesis of (AB) n ‐type block copolymers employing surface‐active macro‐azo initiators
Author(s) -
Nagamune Tsutomu,
Nagai Susumu,
Ueda Akira
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19961010)62:2<359::aid-app10>3.0.co;2-x
Subject(s) - copolymer , polymer chemistry , styrene , polymerization , materials science , maleic anhydride , chemistry , polymer , composite material
A macro‐azo initiator (MAI). prepared by polycondensation of azobiscyanopentanoyl chloride (ACPC) and polyethyleneglycol having average molecular weight of 1000 (PEG1000), was found to show enough surface activity to be usable as an initiator/surfactant (inisurf). Emulsion polymerization of styrene (St) using this MAI as inisurf was carried out and (AB) n ‐type poly(PEO‐ b ‐PSt) block copolymer (where n represents the block‐multiplicity) was obtained. In comparison with solution copolymerization, the emulsion block copolymerization gave PEO‐ b ‐PSt with higher molecular weight due to increased block multiplicity. © 1996 John Wiley & Sons, Inc.