EPR Spectroscopic Characterization of Local Nanoscopic Heterogeneities during the Thermal Collapse of Thermoresponsive Dendronized Polymers
writer：Matthias J. N. Junk, Wen Li, A. Dieter Schlüter, Gerhard Wegner, Hans W. Spiess, Afang Zhang* and ..
keywords：Dendronized polymer, thermoresponsive, phase transition, EPR spectroscopy
source：期刊
specific source：Angew. Chem. Int. Ed. 2010, 49, 5683-5687
Issue time：2010年
The collapse transition of thermoresponsive dendronized polymers could be characterized on a molecular scale by CW EPR spectroscopy. Above the collapse temperature TC, the aggregation of the complete polymer sample is triggered by dynamic structural inhomogeneities of a few nanometers: While macroscopically a sharp phase transition, this study reveals that the dehydration of the polymer chains proceeds over a temperature interval of at least 30 °C and is a case of a molecularly controlled non-equilibrium state.