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Can the glass transition in bulk polymers be modeled by percolation picture?

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Abstract.

Recent observations (Eur. Phys. J. E 9, 135 (2002)) showed that the vitrification process, which sets in during the linear bulk methyl methacrylate (MMA) polymerization carried out below glass transition temperatures, can be modelled by static percolation picture. To generalize this observation for different kind of bulk linear or crosslinked polymers not enough data are present in the literature. To cover partly this deficit we studied the glass transition of MMA and styrene (Sty) crosslinking copolymerization in varying ratios of MMA and Sty. Both the fluorescence intensity I and the lifetime \(\tau \) of pyrene (Py) used as a nanosecond in situ fluoroprobe were monitored during the gelation time. Both I and \(\tau \) increase dramatically as a result of the reduced mobility of the probes trapped in the “glassy” regions, appearing near the glass transition point. The average size of the glassy regions just below, and the strength of the infinite network formed upon the connection of the glassy regions above the glass transition point \(t_{\rm g}\) obey power law relations. The data around \(t_{\rm g}\) were interpreted on the basis of the percolation theory and we observed that the corresponding exponents \(\gamma \) and \(\beta \) give static percolation values independent of the polymer composition.

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Authors and Affiliations

  1. Department of Physics, Istanbul Technical University, Maslak, 80626, Istanbul, Turkey

    Yaşar Yılmaz, Demet Kaya & Önder Pekcan

Authors
  1. Yaşar Yılmaz
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  2. Demet Kaya
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  3. Önder Pekcan
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Correspondence to Yaşar Yılmaz.

Additional information

Received: 9 July 2004, Published online: 1 October 2004

PACS:

64.60.Ak Renormalization-group, fractal, and percolation studies of phase transitions - 64.70.Pf Glass transitions - 82.35.Jk Copolymers, phase transitions, structure

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Yılmaz, Y., Kaya, D. & Pekcan, Ö. Can the glass transition in bulk polymers be modeled by percolation picture?. Eur. Phys. J. E 15, 19–25 (2004). https://doi.org/10.1140/epje/i2003-10156-9

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  • DOI: https://doi.org/10.1140/epje/i2003-10156-9

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