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EPR Spectroscopic Characterization of Local Nanoscopic Heterogeneities during the Thermal Collapse of Thermoresponsive Dendronized Polymers
Author(s) -
Junk Matthias J. N.,
Li Wen,
Schlüter A. Dieter,
Wegner Gerhard,
Spiess Hans W.,
Zhang Afang,
Hinderberger Dariush
Publication year - 2010
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201001469
Subject(s) - polymer , nanoscopic scale , nanometre , characterization (materials science) , phase transition , electron paramagnetic resonance , materials science , chemical physics , polymer science , nanotechnology , chemical engineering , polymer chemistry , chemistry , physics , condensed matter physics , composite material , nuclear magnetic resonance , engineering
The collapse transition of thermoresponsive dendronized polymers was characterized on a molecular scale by CW EPR spectroscopy. Aggregation of the polymer is triggered by dynamic structural inhomogeneities of a few nanometers, and the dehydration of the polymer chains proceeds, despite the sharp phase transition, over a temperature interval of at least 30 °C (see picture).