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Film formation from pure and mixed latices; transient fluorescence study

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Date

2005-11-15

Author

Uğur, Şaziye
Pekcan, Mehmet Önder

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Citation

Uğur, Ş. & Pekcan, M. Ö. (2005). Film formation from pure and mixed latices; transient fluorescence study. Journal of Colloid and Interface Science, 291(2), 405-410. doi:10.1016/j.jcis.2005.05.015

Abstract

A fast transient fluorescence technique was used to study latex film formation induced by organic solvent vapor. Mixtures of pyrene (P)- and naphthalene (N)-labeled and/or pure naphthalene-labeled latex films were prepared separately from poly(methyl methacrylate) (PMMA) particles. Then these pure and mixed latex films were exposed to vapor of various chloroform-heptane mixtures in seven different experiments. In both films, fluorescence lifetimes from N were monitored during vapor-induced film formation. It was observed that N lifetimes decreased as the vapor exposure time is increased. A Stern-Volmer kinetic analysis was used for low quenching efficiencies to interpret the decrease in N lifetimes. A Prager-Tirrell model was employed to obtain back-and-forth frequencies, v, of reptating PMMA chains during latex film formation induced by solvent vapor. In both pure and mixed latex films, v values were found to be correlated with the chloroform content in the vapor mixture. It was observed that polymer interdiffusion obeyed a t(1/2) law during film formation.

Source

Journal of Colloid and Interface Science

Volume

291

Issue

2

URI

https://hdl.handle.net/11729/169
http://dx.doi.org/10.1016/j.jcis.2005.05.015

Collections

  • FEF - Makale Koleksiyonu | Fizik Bölümü / Department of Physics [147]
  • Scopus İndeksli Makale Koleksiyonu [785]
  • WoS İndeksli Makale Koleksiyonu [807]



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