Université de Fribourg

Synthesis and characterization of novel functional electrosterically stabilized colloidal particles prepared by emulsion polymerization using a strongly ionized amphiphilic diblock copolymer

Mohanty, Priti S. ; Dietsch, Hervé ; Rubatat, Laurent ; Stradner, Anna ; Matsumoto, K. ; Matsuoka, H. ; Schurtenberger, Peter

In: Langmuir, 2009, vol. 25, no. 4, p. 1940–1948

Amphiphilic diblock copolymers such as poly(styrene)-block-poly(styrene sulfonate) (PS-b-PSS) (Matsuoka, H.; Maeda, S.; Kaewsaiha, P.; Matsumoto, K. Langmuir 2004, 20, 7412), belong to a class of new polymeric surfactants that ionize strongly in aqueous media. We investigated their self-assembly behavior in aqueous solutions and used them as an emulsifier to...

Université de Fribourg

Structure−properties relationship in proton conductive sulfonated polystyrene−polymethyl methacrylate block copolymers (sPS−PMMA)

Rubatat, Laurent ; Li, Chaoxu ; Dietsch, Hervé ; Nykänen, Antti ; Ruokolainen, Janne ; Mezzenga, Raffaele

In: Macromolecules, 2009, vol. 41, no. 21, p. 8130–8137

We report on the dependence of proton conductivity on the morphologies of sulfonated polystyrene−poly(methyl methacrylate) (sPS−PMMA) diblock copolymers. Three different diblock copolymers of varying molecular weight and block volume fraction were studied, and for each one several sulfonation degrees of the PS block were considered. The investigation of the morphologies of the...

Université de Fribourg

Self-assembly of rod-coil block copolymers for photovoltaic applications

Sary, Nicolas ; Rubatat, Laurent ; Brochon, Cyril ; Hadziioannou, Georges ; Mezzenga, Raffaele

In: Macromolecular Symposia, 2008, vol. 268, no. 1, p. 28-32

Two different approaches to obtain electron donor-acceptor interfaces via self-assembly of block copolymer systems are discussed, where the donor domains are formed by a π-conjugated rod-like polymer and the acceptor domains result from a coiled polymer modified by C₆₀ fullerenes. In the first strategy, C₆₀ is chemically grafted onto the coil polymer, typically a statistical...

Université de Fribourg

Self-assembly of poly(diethylhexyloxy-p-phenylenevinylene)-b-poly(4-vinylpyridine) rod-coil block copolymer systems

Sary, Nicolas ; Rubatat, Laurent ; Brochon, Cyril ; Hadziioannou, Georges ; Ruokolainen, Janne ; Mezzenga, Raffaele

In: Macromolecules, 2007, vol. 40, no. 19, p. 6990 -6997

We describe the synthesis, the morphology, and self-assembly behavior of semiconducting poly(4-vinylpyridine-b-diethylhexyloxy-p-phenylenevinylene) (P4VP-b-PPV) rod-coil block copolymer systems. Three different block copolymers with 55%, 80%, and 88% coil volume fraction were synthesized by convergent anionic polymerization in THF using lithium α-methylstyrene as initiator....