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- Title
Enthalpy relaxation and fragility in polychlorinated biphenyls.
- Authors
Roland, C. M.; Casalini, R.
- Abstract
We employ temperature modulated DSC (TMDSC) to determine the dependence of the fictive temperature on cooling rate for a series of polychlorinated biphenyls (PCB). From the slopes of semi-logarithmic plots of cooling rate vs. fictive temperature, the latter normalized by the fictive temperature for an arbitrary cooling rate, we determine the enthalpic fragilities. Despite significant differences in glass transition temperature and chemical structure (specifically chlorine content), the PCB have the same fragility. The value of the fragility determined using TMDSC is consistent with the fragility previously determined using dielectric relaxation spectroscopy.
- Subjects
ENTHALPY; GIBBS' free energy; POLYCHLORINATED biphenyls; ORGANOCHLORINE compounds; THERMAL analysis; RELAXATION spectroscopy
- Publication
Journal of Thermal Analysis & Calorimetry, 2006, Vol 83, Issue 1, p87
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-005-7221-7