Volume 82, Number 2, April 2008
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||11 April 2008|
Conformational transitions of conjugated annealed polyelectrolytes
Institut Charles Sadron, ULP-CNRS, UPR22 - 23 Rue du Loess, BP 84047, F-67034 Strasbourg cedex 2, France, EU
Accepted: 2 March 2008
We study the collapse of hydrophobic annealed polyelectrolytes with a conjugated polythiophene backbone as a function of pH. The evolution of UV-visible absorption spectra suggests the existence of two conformational transitions: extended collapsed densely collapsed, and we measure the fraction of monomers in the three states as a function of neutralization degree. The first transition displays the qualitative features of the first-order transition predicted for hydrophobic annealed polyelectrolytes. The second transition is tentatively associated with the increase of H-bonding in the collapsed chains at low pH.
PACS: 82.35.Rs – Polyelectrolytes / 78.40.-q – Absorption and reflection spectra: visible and ultraviolet / 05.70.Fh – Phase transitions: general studies
© EPLA, 2008
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