Advertisement

Gels pp 89-97 | Cite as

Flourescence method to study gelation swelling and drying processes in gels formed by solution free radical compolymerization

  • Ö. Pekcan
  • Y. Yilmaz
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 102)

Abstract

Gelation during solution free radical crosslinking copolymerization (FCC) of methyl methacrylate (MMA) and ethylene glycol dimethacrylate (EGDM) was studied by using the steady state fluorescence technqiue. FCC was performed in the presence of toluence at 75°C. Sol-gel transitions were monitored by observing the direct intensity of an excited pyrene (Py) during in situ fluorescence experiments for various toluence content. Gel points were determined and critical β exponents were found to be around 0.38. In situ swelling and drying experiments were performed at 50°C by monitoring Py intensity in disk-shaped gels produced by solution FCC. Li-Tanaka equation was employed to produce the cooperative diffusion coefficient, D c for swelling process. D c values were found to the around 10−6 cm2/s at 50°C. It was also observed that loosly formed gels swell much faster than densely formed gels.

Key words

Fluorescence percolation gelation swelling drying 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Flory PJ (1953) Principles for Polymer Chemistry Cornell University, Ithaca NYGoogle Scholar
  2. 2.
    Family F, Landau DP (eds) (1984) Kinetics of Aggregation and Gelation North Holland, AmsterdamGoogle Scholar
  3. 3.
    Stauffer D (1985) Introduction to Percolation Theory, Taylor and Francis, LondonGoogle Scholar
  4. 4.
    Hermann H (1986) J Phys Rev (153:136Google Scholar
  5. 5.
    Sockmayer WH (1943) J Chem Phys 45:11Google Scholar
  6. 6.
    Dusek, K, Paterson D (1968) J Polym Sci A2 6:1209Google Scholar
  7. 7.
    Tanaka T (1980) Phys Rev Lett 45:1636CrossRefGoogle Scholar
  8. 8.
    Tobolsky AV, Goobel JC (1970) Macromolecules 3:566CrossRefGoogle Scholar
  9. 9.
    Schild HG (1992) Prog Polym Sci 17:163CrossRefGoogle Scholar
  10. 10.
    Amiya T, Tanaka T (1987) Macromolecules 20:1162CrossRefGoogle Scholar
  11. 11.
    Li Y, Tanaka T (1990) J Chem Phys 92(2):1365CrossRefGoogle Scholar
  12. 12.
    Zrinyi M, Rosta, J, Horkay F (1993) Macromolecules, 26:3097CrossRefGoogle Scholar
  13. 13.
    Candau S, Baltide J, Delsanti M (1982) Adv Polym Sci 7:44Google Scholar
  14. 14.
    Geissler E, Hecht AM (1980) Macromolecues 13:1276CrossRefGoogle Scholar
  15. 15.
    Zrinyi M, Horkay F (1982) J Polym Sci Polym Ed 20:815CrossRefGoogle Scholar
  16. 16.
    Tanaka T, Filmore D (1979) J. Chem Phys 20:1214CrossRefGoogle Scholar
  17. 17.
    Peters A, Candau SJ (1988) Macromolecules 21:2278CrossRefGoogle Scholar
  18. 18.
    Bastide J, DuOplessix R, Picot C, Candau S (1984) Macromolecules 17:83CrossRefGoogle Scholar
  19. 19.
    Chi WU, Chni-Ying Tan (1994) Macromolecules 27:4516CrossRefGoogle Scholar
  20. 20.
    Lin KF, Wang FW (1994) Polymer 4:687CrossRefGoogle Scholar
  21. 21.
    Wandelt B, Birch DJS, Imhof RE, Holmes AS, Pethnick RA (1991) Macromolecules 24:5141CrossRefGoogle Scholar
  22. 22.
    Panxviel JC, Dunn B, Zink JJ (1989) J Phys Chem 93:2134CrossRefGoogle Scholar
  23. 23.
    Pekcan Ö, Yilmaz Y, Okay O (1994) Chem Phys Lett 229:537CrossRefGoogle Scholar
  24. 24.
    Pekcan Ö, Yilmaz Y, Okay O, Polymer (in press)Google Scholar
  25. 25.
    Stauffer D, Coniglio A, Adam M (1982) “Gelation and Critical Phenomena“ Advances in Polym Sci Springer-Verlag, Berlin, Heidelberg 74:44Google Scholar
  26. 26.
    Kropp LJ, Dawson RW (1969) “Fluorescence and Phosphorescence of Aromatic Hydrocarbons in Polymethylmethacrylate” Molecular Luminescence on internation Conference, Ed. Lim, EC, New York, BenjaminGoogle Scholar
  27. 27.
    Bixon M, Jortner J (1968) J Chem Phys 48:715CrossRefGoogle Scholar
  28. 28.
    Birks JB, Lumb MD, Munro IH (1964) Proc Roy Soc A 277:289CrossRefGoogle Scholar
  29. 29.
    Jones PF, Siegel J (1969) J Chem Phys 50:1134CrossRefGoogle Scholar
  30. 30.
    Pekcan Ö (1995) J Apply Polym Sci 57:125CrossRefGoogle Scholar
  31. 31.
    Okay O, Gürün Ç (1992) J Apply Polym Sci 46:421CrossRefGoogle Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1996

Authors and Affiliations

  • Ö. Pekcan
    • 1
  • Y. Yilmaz
    • 1
  1. 1.Department of PhysicsIstanbul Technical University MaslakIstanbulTurkey

Personalised recommendations