NDLI: Thermal and dielectric studies of 2,2’-dihydroxybenzophenone : Progress of crystal nucleation and growth below the glass transition temperature

Content Provider	Springer Nature Link
Author	Tomitaka, S. Mizukami, M. Paladi, F. Oguni, M.
Copyright Year	2005
Abstract	Thermal and dielectric properties of 2,2’-dihydroxybenzophenone were studied in relation with the potential progress of crystal nucleation and growth below the ordinary glass transition temperature, T$_{gα}$. Differential scanning calorimetry was carried out in a range 100-350 K. The α glass transition was found to occur at T$_{gα}$=239 K. Crystallization and fusion were observed to take place when the sample was cooled down to 103 K, but not observed when cooled to 203 K. Crystal nucleation was interpreted as having happened during annealing for a short time at 103 K which is much below the T$_{gα}$. Heat capacities were measured in a range 7-350 K by an intermittent heating method with an adiabatic calorimeter. The temperature, enthalpy and entropy of fusion were determined to be 334.46 K, 20.07 kJ mol$^{-1}$ and 60.01 J K$^{-1}$mol$^{-1}$, respectively. Crystal growth was found to proceed even at 220 K below the T$_{gα}$, but no glass transition was detected below 220 K. Dielectric losses were measured in a temperature range of 100-250 K and a frequency range of 30Hz-10 kHz. β-Relaxation process was found dielectrically with the activation energy of 22.6 kJ mol$^{-1}$, and the corresponding glass transition was expected to occur at 76.9 K. It is discussed, based on the “structurally ordered clusters aggregation” model for supercooled liquids and glasses, that the β process is potentially attributed to the crystal nucleation progressing at 103 K.
Starting Page	637
Ending Page	643
Page Count	7
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	81
Issue Number	3
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Physical Chemistry Polymer Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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