A fluorescence study on the critical exponents for the linear polymerization of butyl-methacrylate

D. K. Aktaş*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The steady-state fluorescence (SSF) technique was used to study the sol-gel transition for the linear bulk polymerization of butyl methacrylate (BMA), carried out above the glass transition temperature of polybutylmethacrylate (PBMA) (Tg = 20C). Pyrene (Py) was used as the fluorescence probe. The increase in Py intensity was monitored during free radical polymerization of BMA by using SSF technique. Changes in the viscosity of the pregel solutions due to gel formation dramatically enhance the fluorescent yield of aromatic molecules. This effect is used to monitor the sol-gel transition of BMA, as a function of time, at various temperatures. The results are interpreted in the view of percolation theory. The gel fraction exponent = 0.39 0.02 agreed the best with the static percolation values for the linear bulk BMA polymerization carried out above Tg but weight average degree of polymerization exponent, deviated from the percolation results.

Original languageEnglish
Pages (from-to)863-873
Number of pages11
JournalPhase Transitions
Volume79
Issue number11
DOIs
Publication statusPublished - Nov 2006

Keywords

  • Activation energy
  • Critical exponents
  • Fluorescence
  • Percolation
  • Sol-gel transition

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