Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.53: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P3
Micellar solutions of novel thermoresponsive diblock copolymers — •Lukas Augsbach1, Konstantinos Kyriakos1, Anna Miasnikova2, André Laschewsky2, Zhenyu Di3, Peter Müller-Buschbaum1, and Christine M. Papadakis1 — 1TU München, Physik-Department, Garching — 2Universität Potsdam, Institut für Chemie, Potsdam-Golm — 3Jülich Centre for Neutron Science, Outstation JCNS, MLZ, Garching
Amphiphilic diblock copolymers with a thermoresponsive block self-assemble into thermoresponsive micelles in aqueous solution. Poly(methoxydiethyleneglycol acrylate) (PMDEGA) is a novel thermoresponsive system, which exhibits cloud points,Tcp ,in the range 35-45 ∘C [1]. This system shows peculiar behavior, such as a broad transition region. Moreover, the collapse of the micellar shell has not yet been detected.
Here, we report on small-angle neutron scattering (SANS) experiments on a micellar solution of P(S-b-MDEGA) (PS stands for polystyrene) around Tcp. The focus is on the structural changes at the cloud point, such as the micellar radius and the correlation of the micelles. At the cloud point, significant structural changes are observed, and the transition occurs over a broad temperature range with intermediate stages, in agreement with previous results on similar PMDEGA systems [2].
[1] A. Miasnikova, A. Laschewsky J. Polym. Sci. Part A: Polym. Chem. 2012, 50, 3313
[2] A. Miasnikova, et al., Langmuir 2012, 28, 4479