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

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Abstract.

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.

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Authors and Affiliations

  1. Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Ch. Musée 3, CH-1700, Fribourg, Switzerland

    N. Sary & R. Mezzenga

  2. Laboratoire d'Ingénierie des Polymères pour les Hautes Technologies, UMR 7165, Université Louis Pasteur, Ecole Européenne de Chimie, Polymères et Matériaux, 25, Rue Becquerel, F-67087, Strasbourg, France

    C. Brochon & G. Hadziioannou

  3. Nestlé Research Center, CH-1000 Lausanne 26, Vers-Chez-Les-Blanc, Switzerland

    R. Mezzenga

Authors
  1. N. Sary
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  2. C. Brochon
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  3. G. Hadziioannou
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  4. R. Mezzenga
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Correspondence to R. Mezzenga.

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Sary, N., Brochon, C., Hadziioannou, G. et al. Self-assembly of rod-coil block copolymers from weakly to moderately segregated regimes. Eur. Phys. J. E 24, 379–384 (2007). https://doi.org/10.1140/epje/i2007-10249-5

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  • DOI: https://doi.org/10.1140/epje/i2007-10249-5

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