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Additional Retardation in RAFT Polymerization: Detection of Terminated Intermediate Radicals
Author(s) -
Bathfield Maël,
D'Agosto Franck,
Spitz Roger,
Ladavière Catherine,
Charreyre MarieThérèse,
Delair Thierry
Publication year - 2007
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.200600861
Subject(s) - morpholine , chain transfer , raft , radical , polymerization , chemistry , moiety , reversible addition−fragmentation chain transfer polymerization , polymer chemistry , fragmentation (computing) , molar mass , radical polymerization , stereochemistry , organic chemistry , polymer , computer science , operating system
The reversible addition‐fragmentation chain transfer (RAFT) polymerization of N ‐acryloylmorpholine (NAM) is performed using three dithioesters (DT) as chain transfer agents (CTA) that incorporate a morpholine (morpholine‐DT), a biotin (biotin‐DT), or a sugar (sugar‐DT) moiety in the R group. PolyNAM chains of controlled characteristics are synthesized. An unexpected behavior is observed with morpholine‐DT, described as an ‘additional retardation’, which is especially visible when low molar masses are targeted ( $\overline M _{\rm n} $ < 5 000 g · mol −1 ). In that particular case, further investigations using MALDI‐TOF mass spectrometry show the presence of terminated intermediate radicals (IRs), which corroborates the assumption based on a specific protection of IR according to the nature of the α ‐chain‐end.