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Self-assembly of rod-coil block copolymers from weakly to moderately segregated regimes

  • Sary, Nicolas Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Brochon, Cyril Laboratoire d'Ingénierie des Polymères pour les Hautes Technologies, Université Louis Pasteur, Ecole Européenne de Chimie, Polymères et Matériaux, Strasbourg, France
  • Hadziioannou, G. Laboratoire d'Ingénierie des Polymères pour les Hautes Technologies, Université Louis Pasteur, Ecole Européenne de Chimie, Polymères et Matériaux, Strasbourg, France
  • Mezzenga, Raffaele Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland - Nestlé Research Center, Lausanne, Switzerland
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    21.01.2008
Published in:
  • The European Physical Journal E. - 2007, vol. 24, no. 4, p. 379-384
Nanoscale materials
Polymer liquid crystals
Order-disorder transformations
statistical mechanics of model systems
English We report on the self-assembly behaviour of two homologue series of rod-coil block copolymers in which, the rod, a π -conjugated polymer, is maintained fixed in size and chemical structure, while the coil is allowed to vary both in molecular weight and chemical nature. This allows maintaining constant the liquid crystalline interactions, expressed by Maier-Saupe interactions, ω , while varying the tendency towards microphase separation, expressed by the product between the Flory-Huggins parameter and the total polymerization degree, χN . Therefore, the systems presented here allow testing directly some of the theoretical predictions for the self- assembly of rod-coil block copolymers in a weakly segregated regime. The two rod- coil block copolymer systems investigated were poly(DEH-p-phenylenevinylene-b- styrene), whose self-assembly takes place in the very weakly segregated regime, and poly(DEH-p-phenylenevinylene-b-4vinylpyridine), for which the self-assembly behaviour occurs under increased tendency towards microphase separation, hereby referred to as moderately segregated regime. Experimental results for both systems are compared with predictions based on Landau expansion theories.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Chemistry
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https://folia.unifr.ch/unifr/documents/300816
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