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Carboxy‐terminated homo‐ and copolymers of styrene using dicarboxylic acid‐functional azo initiator and 2,2,6,6‐tetramethyl‐1‐piperidyloxyl (TEMPO)
Author(s) -
Baumert Martin,
Mülhaupt Rolf
Publication year - 1997
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.1997.030180906
Subject(s) - copolymer , polymer chemistry , acrylonitrile , styrene , polystyrene , differential scanning calorimetry , radical polymerization , polymerization , materials science , titration , bulk polymerization , chemistry , polymer , organic chemistry , physics , thermodynamics , composite material
Carboxy‐terminated polystyrene, poly(styrene‐ co ‐acrylonitrile), and polystyrene‐ block ‐poly(styrene‐ co ‐acrylonitrile) with ratios of weight‐ to number‐average molar masses M̄ w / M̄ n below 1.3 were synthesized via a controlled radical polymerization mechanism. The polymerizations were initiated with 4,4′‐azobis(4‐cyanopentane‐carboxylic acid) and 2,2,6,6‐tetramethyl‐1‐piperidyloxyl radical and conducted in bulk at elevated temperatures. The polymerization was monitored by nuclear magnetic resonance, size‐exclusion chromatography, end‐group titration and differential scanning calorimetry.