Dokument-ID Dokumenttyp Verfasser/Autoren Herausgeber Haupttitel Abstract Auflage Verlagsort Verlag Erscheinungsjahr Seitenzahl Schriftenreihe Titel Schriftenreihe Bandzahl ISBN Quelle der Hochschulschrift Konferenzname Quelle:Titel Quelle:Jahrgang Quelle:Heftnummer Quelle:Erste Seite Quelle:Letzte Seite URN DOI Abteilungen OPUS4-37678 Wissenschaftlicher Artikel Kyriakos, Konstantinos; Aravopoulou, Dionysia; Augsbach, Lukas; Sapper, Josef; Ottinger, Sarah; Psylla, Christina; Rafat, Ali Aghebat; Benitez-Montoya, Carlos Adrian; Miasnikova, Anna; Di, Zhenyu; Laschewsky, André; Müller-Buschbaum, Peter; Kyritsis, Apostolos; Papadakis, Christine M. Novel thermoresponsive block copolymers having different architectures-structural, rheological, thermal, and dielectric investigations Thermoresponsive block copolymers comprising long, hydrophilic, nonionic poly(methoxy diethylene glycol acrylate) (PMDEGA) blocks and short hydrophobic polystyrene (PS) blocks are investigated in aqueous solution. Various architectures, namely diblock, triblock, and starblock copolymers are studied as well as a PMDEGA homopolymer as reference, over a wide concentration range. For specific characterization methods, polymers were labeled, either by partial deuteration (for neutron scattering studies) or by fluorophores. Using fluorescence correlation spectroscopy, critical micellization concentrations are identified and the hydrodynamic radii of the micelles, r (h) (mic) , are determined. Using dynamic light scattering, the behavior of r (h) (mic) in dependence on temperature and the cloud points are measured. Small-angle neutron scattering enabled the detailed structural investigation of the micelles and their aggregates below and above the cloud point. Viscosity measurements are carried out to determine the activation energies in dependence on the molecular architecture. Differential scanning calorimetry at high polymer concentration reveals the glass transition of the polymers, the fraction of uncrystallized water and effects of the phase transition at the cloud point. Dielectric relaxation spectroscopy shows that the polarization changes reversibly at the cloud point, which reflects the formation of large aggregates upon heating through the cloud point and their redissolution upon cooling. New York Springer 2014 18 Colloid and polymer science : official journal of the Kolloid-Gesellschaft 292 8 1757 1774 10.1007/s00396-014-3282-0 Institut für Chemie