Glass transition relaxation and fragility in the molecular glass forming m-toluidine: a study by thermally stimulated depolarization currents

Journal of Chemical Physics

Volumn 113, Issue 8, 2000, Pages 3204-3211

  Correia, Natália T ^a   Alvarez, Cristina ^a   Moura Ramos, Joaquim J ^a   Descamps, Marc ^b  

^a INSTITUTO SUPERIOR TÉCNICO   (Portugal)

^b UNIVERSITÉ LILLE 1   (France)

Author keywords

[No Author keywords available]

Indexed keywords

AGING OF MATERIALS; CRYSTALLIZATION; DIFFERENTIAL SCANNING CALORIMETRY; ENTHALPY; ENTROPY; GLASS TRANSITION; NUMERICAL METHODS; RELAXATION PROCESSES; SPECTROMETERS; SPECTROSCOPY; TEMPERATURE;

COMPENSATION BEHAVIOR; FRAGILITY INDEX; GLASS FORMER; THERMALLY STIMULATED DEPOLARIZATION CURRENTS; TOLUIDINE;

ORGANIC COMPOUNDS;

EID: 0034702705     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.1286959     Document Type: Article

References (30)

1. A. P. Solokov, Science 273, 1675 (1996).
2. A. P. Solokov, Endeavour 21, 109 (1997).
3. C. A. Angell, Science 267, 1924 (1995).
4. C. A. Angell, P. H. Poole, and J. Shao, Nuovo Cimento 16D, 993 (1994).
5. C. A. Angell, J. Res. Natl. Inst. Stand. Technol. 102, 171 (1997).
6. M. D. Ediger, C. A. Angell, and S. R. Nagel, J. Phys. Chem. 100, 13200 (1996).
7. C. A. Angell, Curr. Opin. Solid State Mater. Sci. 1, 578 (1996).
8. N. T. Correia, C. Alvarez, J. J. Moura Ramos, and M. Descamps, Chem. Phys. 252, 151 (2000).
9. V. Legrand, M. Descamps, and C. Alba-Simionesco, Thermochim. Acta 307, 77 (1997).
10. L. Mbaze meva's and A. Lichanot, Thermochim. Acta 158, 335 (1990).
11. N. T. Correia, J. M. Campos, and J. J. Moura Ramos, J. Chem. Soc., Faraday Trans. 93, 157 (1997).
12. J. van Turnhout, Thermally Stimulated Discharge of Polymer Electrets (Elsevier, Amsteradam, 1975).
13. R. Chen and Y. Kirsch, Analysis of Thermally Stimulated Processes (Pergamon, Oxford, 1981).
14. J. F. Mano, N. T. Correia, J. J. Moura Ramos, S. R. Andrews, and G. Williams, Liq. Cryst. 20, 201 (1996).
15. C. Bucci, R. Fieschi, and G. Guidi, Phys. Rev. 148, 816 (1966).
16. A. K. Jonscher, Universal Relaxation Law (Chelsea, London, 1996).
17. It is to be recalled that, in a TSDC global experiment, where the electric field is applied in a large temperature interval, the polarization includes a very wide variety of modes of motion. In a thermal sampling (TS) experiment, on the other hand, the field is applied in a narrow temperature interval, so that the polarization includes a narrow distribution of modes of motion. The width of the distribution of polarized modes decreases as the width of the polarization window decreases.
18. N. T. Correia and J. J. Moura Ramos, J. Polym. Sci., Polym. Phys. Ed. 37, 227 (1999).
19. The equation to be used for fitting the data must have sufficient parameters to have the flexibility which is necessary to ensure a good fitting. In the present work a Vogel-type equation was used.
20. H. W. Starkweather, Macromolecules 14, 1277 (1981).
21. J. J. Moura Ramos, J. F. Mano, and B. B. Sauer, Polymer 38, 1081 (1997).
22. H. W. Starkweather, Jr., Polymer 32, 2443 (1991).
23. B. B. Sauer, P. Avakian, H. W. Starkweather, and B. S. Hsiao, Macromolecules 23, 5119 (1990).
24. R. Bohmer, K. L. Ngai, C. A. Angell, and D. J. Plazek, J. Chem. Phys. 99, 4201 (1993).
25. C. A. Angell, J. Non-Cryst. Solids 131-133, 13 (1991).
26. g)=100 seconds used for scaling the temperature in the Angell's definition of the fragility index [Eq. (7)].
27. A. Alegria, L. Goitiandia, and J. Colmenero, Polymer 37, 2915 (1996).
28. C. Lacabanne, A. Lamure, G. Teyssèdre, A. Bernes, and M. Mourgues, J. Non-Cryst. Solids 172-174, 884 (1994).
29. A. Bernes, R. F. Boyer, D. Chatain, C. Lacabanne, and J. P. Ibar, in Thermally Stimulated Current Studies of Transitions in Amorphous Polymers, Order in the Amorphous State of Polymers, edited by S. E. Keimath, R. L. Miller, and J. K. Rieke (Plenum, London, 1987).
30. B. B. Sauer and J. J. Moura Ramos, Polymer 38, 4065 (1997).