Advertisement

Journal of Thermal Analysis and Calorimetry

, Volume 71, Issue 2, pp 387–393 | Cite as

Volume and enthalpy relaxation in a-PMMA after temperature up-jumps

  • P SlobodianEmail author
  • A Lengálová
  • P Sáha
Article

Abstract

the volume and enthalpy relaxation in a-PMMA subjected to temperature jumps in tg region has been analysed. The measured H and V data were compared with respect to aging time and proportionality between them as a slope of (∂H/∂V)T dependencies has been found. According to previous works the slope was identified as an apparent bulk modulus, Ka. This method is applied to aging following temperature up-jumps after consolidation periods of varying lengths. the main finding is a marked increase of Ka with consolidation time, approaching a limiting value in an asymptotic fashion.

enthalpy relaxation volume relaxation a-PMMA memory effect physical aging 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    J. M. Hutchinson, Prog. Polym. Sci., 20 (1995) 703.CrossRefGoogle Scholar
  2. 2.
    R. N. Haward and R. J. Young, The physics of glassy polymers, second edition, Chapman and Hall, London 1997, p. 85.Google Scholar
  3. 3.
    K. Adachi and T. Kotaka, Polym. J., 14 (1982) 959.CrossRefGoogle Scholar
  4. 4.
    S. L. Simon, J. W. Sobieski and D. J. Plazek, Polymer, 42 (2001) 2555.CrossRefGoogle Scholar
  5. 5.
    S. L. Simon, D. J. Plazek, J. W. Sobiesky and E. T. McGregor, J. Poly. Sci. Phys., 35 (1997) 929.CrossRefGoogle Scholar
  6. 6.
    F. O. Olejnik, Polymer Journal, 19 (1987) 105.CrossRefGoogle Scholar
  7. 7.
    M. J. Kubát, J. Vernel, R.W. Rychwalski and J. Kubát, Polym. Eng. Sci., 38 (1998) 1261.CrossRefGoogle Scholar
  8. 8.
    P. Slobodian, V. Pelíšek, J. Kubát and P. Sáha, SPE ANTEC Tech. Papers, 59 (2001) 1501.Google Scholar
  9. 9.
    P. Slobodian, J. Vilčáková and P. Sáha, SPE ANTEC Tech. Papers, 60 (2002) 3874.Google Scholar
  10. 10.
    J. Málek and T. Mitsuhashi, J. Therm. Anal. Cal., 57 (1999) 707.CrossRefGoogle Scholar
  11. 11.
    J. Málek, Macromol., 31 (1998) 8312.CrossRefGoogle Scholar
  12. 12.
    J. Málek and S. Montserrat, Thermochim. Acta, 313 (1998) 191.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers/Akadémiai Kiadó 2003

Authors and Affiliations

  1. 1.Faculty of Technology, Polymer CentreTomas Bata University in ZlínZlín, Czech Republic

Personalised recommendations