Advertisement

Journal of Thermal Analysis and Calorimetry

, Volume 92, Issue 1, pp 233–238 | Cite as

Thermal decomposition kinetics of some aromatic azomonoethers

Part II. Non-isothermal study of three liquid crystals in dynamic air atmosphere
  • A. RotaruEmail author
  • Anna Kropidłowska
  • Anca Moanţă
  • P. Rotaru
  • E. Segal
Article

Abstract

Thermal analysis of three azomonoether dyes, exhibiting liquid-crystalline properties, was performed in dynamic air atmosphere. Thermal stability studies and the evaluation of the kinetic parameters of each physical or chemical transformations are essential for a full characterization, before attempting accurate thin films’ depositions of such materials used in non-linear optical applications. New synthesized dyes with general formula:
where R is a nematogenic group: CN, CF3 or a highly polarizable group: NO2 were investigated using TG, DTG, DTA and DSC techniques, under non-isothermal regime. The evolved gases were analyzed by FTIR spectroscopy. The activation energies of the first decomposition step were evaluated for each compound, the obtained results revealing complex mechanisms.

Keywords

dyes isoconversional methods liquid crystals non-isothermal kinetics thermal analysis 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    S. Radu, C. Sarpe-Tudoran, A. Jianu and G. Rau, Rev. Roum. Chim., 43 (1998) 735.Google Scholar
  2. 2.
    A. Rotaru, A. Moanţă, I. Sălăgeanu, P. Budrugeac and E. Segal, J. Therm. Anal. Cal., 87 (2007) 395.CrossRefGoogle Scholar
  3. 3.
    A. Rotaru, B. Jurca, A. Moanţa, I. Sălăgeanu and E. Segal, Rev. Roum. Chim., 51 (2006) 373.Google Scholar
  4. 4.
    A. Rotaru, C. Constantinescu, P. Rotaru, A. Moanţă, M. Dumitru, M. Socaciu, M. Dinescu and E. Segal, J. Therm. Anal. Cal., DOI: 10.1007/s10973-007-8818-9.Google Scholar
  5. 5.
    J. Malek, Thermochim. Acta, 200 (1992) 257.CrossRefGoogle Scholar
  6. 6.
    S. Vyazovkin and C. A. Wright, Thermochim. Acta, 340/341 (1999) 53.CrossRefGoogle Scholar
  7. 7.
    A. I. Lesnikovich and S. V. Levchik, J. Thermal Anal., 27 (1983) 89.CrossRefGoogle Scholar
  8. 8.
    H. Tanaka and M. E. Brown, J. Therm. Anal. Cal., 80 (2005) 795.CrossRefGoogle Scholar
  9. 9.
    M. Maciejewski and S. Vyazovkin, Thermochim. Acta, 370 (2001) 149.CrossRefGoogle Scholar
  10. 10.
    P. Budrugeac, E. Segal, L.A. Perez-Maqueda and J. M. Criado, Polym. Degrad. Stab., 84 (2004) 311.CrossRefGoogle Scholar
  11. 11.
    M. E. Brown, M. Maciejewski, S. Vyazovkin, R. Nomen, J. Sempere, A. K. Burnham, J. Opfermann, R. Strey, H. Andreson, A. Kemmler, R. Keuleers, J. Jannsens, H. O. Desseyn, C. R. Li, T. B. Tang, B. Roduit, J. Malek and T. Mitsuhasni, Thermochim. Acta., 355 (2000) 125.CrossRefGoogle Scholar
  12. 12.
    A. Pratap, T. L. Shanker Rao, K. N. Lad and H. D. Dhurandhar, J. Therm. Anal. Cal., 89 (2007) 399.CrossRefGoogle Scholar
  13. 13.
    B. Howell, J. Therm. Anal. Cal., 85 (2006) 165.CrossRefGoogle Scholar
  14. 14.
    B. Roduit, C. Borgeat, B. Berger, P. Folly, H. Andres, U. Schadeli and B. Vogelsanger, J. Therm. Anal. Cal., 85 (2006) 195.CrossRefGoogle Scholar
  15. 15.
    O. C. Mocioiu, M. Zaharescu, G. Jitianu and P. Budrugeac, J. Therm. Anal. Cal., 86 (2006) 429.CrossRefGoogle Scholar
  16. 16.
    V. Musat, P. Budrugeac, R. C. C. Monteiro, E. Fortunato and E. Segal, J. Therm. Anal. Cal., 89 (2007) 505.CrossRefGoogle Scholar
  17. 17.
    H. C. Yang, Y. J. Cho, H. C. Eun, E. H. Kim and I. T. Kim, J. Therm. Anal. Cal., 90 (2007) 379.CrossRefGoogle Scholar
  18. 18.
    Y. J. Wan, J. L. Li and D. H. Chen, J. Therm. Anal. Cal., 90 (2007) 415.CrossRefGoogle Scholar
  19. 19.
    P. Budrugeac, Polym. Degrad. Stab., 89 (2005) 265.CrossRefGoogle Scholar
  20. 20.
    J. R. Opfermann and W. Hadrich, Thermochim. Acta., 263 (1995) 29.CrossRefGoogle Scholar
  21. 21.
    J. R. Opfermann, J. Therm. Anal. Cal., 60 (2000) 641.CrossRefGoogle Scholar
  22. 22.
    J. H. Flynn and L.A. Wall, J. Res. Natl. Bur. Stand., J. Phys. Chem., 70 (1966) 487.Google Scholar
  23. 23.
    T. Ozawa, Bull. Chem. Soc. Jpn., 38 (1965) 1881.CrossRefGoogle Scholar
  24. 24.
    H. Kissinger, Anal. Chem., 29 (1957) 1702.CrossRefGoogle Scholar
  25. 25.
    T. Akahira and T. Sunose, Res. Report Chiba Inst. Technol., 16 (1971) 22.Google Scholar
  26. 26.
    C. D. Doyle, J. Appl. Polym. Sci., 6 (1962) 639.CrossRefGoogle Scholar
  27. 27.
    A. W. Coats and J. P. Redfern, Nature, 201 (1964) 68.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  • A. Rotaru
    • 1
    Email author
  • Anna Kropidłowska
    • 2
  • Anca Moanţă
    • 3
  • P. Rotaru
    • 4
  • E. Segal
    • 5
  1. 1.Laser Department, PPAMINFLPR, National Institute for Laser, Plasma and Radiation PhysicsMagureleRomania
  2. 2.Department of Inorganic Chemistry, Chemical FacultyGdańsk University of TechnologyGdańskPoland
  3. 3.Faculty of ChemistryUniversity of CraiovaCraiovaRomania
  4. 4.Faculty of PhysicsUniversity of CraiovaCraiovaRomania
  5. 5.Department of Physical Chemistry, Faculty of ChemistryUniversity of BucharestBucharestRomania

Personalised recommendations