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Comparision of critical parameters of polymerization and gelation processes: A fast transient fluorescence study

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Date

2005-03-10

Author

Kaya, Demet
Pekcan, Mehmet Önder

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Citation

Kaya, D. & Pekcan, M. Ö. (2005). Comparision of critical parameters of polymerization and gelation processes: A fast transient fluorescence study. International Journal of Modern Physics B, 19(6), 971-987. doi:10.1142/S0217979205029390

Abstract

The fast transient fluorescence technique was used to study free-radical polymerization and crosslinking copolymerization of styrene. Ethylene glycol dimethacrylate and Pyrene were used as crosslinking agent and fluorescence probe, respectively. The fluorescence lifetimes of Pyrene from its decay traces were measured and used to monitor the vitrification processes at various temperatures. Changes in the viscosity due to polymer formation dramatically enhanced the fluorescent yield of pyrene molecules. This effect is used to monitor the polymerization and crosslinking copolymerization of Styrene as a function of time, at various temperatures. The results are interpreted in the view of static percolation theory. The critical exponents ß and ? for vitrified fraction and average degree of polymerization were found to be 0.39 ± 0.012; 1.62 ± 0.036 and 0.39 ± 0.004; 1.69 ± 0.064 in agreement with percolation results for polymerization and gelation processes, respectively. Activation energies for polymerization and gelation (?EP and ?EG) were measured and found to be 112.0 ± 4 and 86.9 ± 4 kJ mol-1, respectively.

Source

International Journal of Modern Physics B

Volume

19

Issue

6

URI

https://hdl.handle.net/11729/2035
https://dx.doi.org/10.1142/S0217979205029390

Collections

  • FEF - Makale Koleksiyonu | Fizik Bölümü / Department of Physics [147]
  • Scopus İndeksli Makale Koleksiyonu [785]



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