Glass transition cooperativity from heat capacity spectroscopy—temperature dependence and experimental uncertainties

Autor:	S. Weyer, Heiko Huth, M. Merzlyakov, Christoph Schick, E. Donth, Mario Beiner
Rok vydání:	2001
Předmět:	Styrene-butadiene Thermodynamics Cooperativity Calorimetry Condensed Matter Physics Heat capacity chemistry.chemical_compound chemistry Polymer chemistry Polystyrene Physics::Chemical Physics Physical and Theoretical Chemistry Thermal analysis Spectroscopy Glass transition Instrumentation
Zdroj:	Thermochimica Acta. 377:113-124
ISSN:	0040-6031
DOI:	10.1016/s0040-6031(01)00546-9
Popis:	The influence of experimental uncertainties of calorimetric parameters from heat capacity spectroscopy on the temperature-dependent glass transition cooperativity N α from the fluctuation approach is studied. Glass transition parameters from 3 ω method and temperature modulated DSC are compared. The influence of the stationary temperature field on the output of the 3 ω method is studied. Special advantages and disadvantages of 3 ω method and temperature modulated DSC for the determination of glass transition cooperativity are discussed. It is confirmed that the temperature-dependent cooperativity indicates, independent from experimental uncertainties, a cooperativity onset in the crossover region. The extrapolated onset temperature T on from calorimetry is shown to be comparable with other, independently obtained crossover temperatures for polystyrene and styrene butadiene rubber (SBR 1500).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f14c21d8b71c83ddea094bb4b2f902fc https://doi.org/10.1016/s0040-6031(01)00546-9 Zobrazit plný text záznamu Full Text from ScienceDirect