Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 27: Poster: (Hydrogels) and Elastomers
CPP 27.14: Poster
Mittwoch, 28. März 2012, 11:00–13:00, Poster A
Static, dynamic and kinetic property changes around the collapse transition of PNIPAM solutions as seen by Temperature Modulated Optical Refractometry — •Ralitsa Aleksandrova1, Ulrich Müller1, Martine Philipp1,2, Roland Sanctuary1, Peter Müller-Buschbaum2, and Jan-Kristian Krüger1 — 1Université du Luxembourg, Faculté des Sciences, de la Technologie et de la Communication 162 A, avenue de la Faïencerie L-1511 Luxembourg — 2Technische Universität München, Physik-Department E13, Lehrstuhl für Funktionelle Materialien, 85747 Garching, Germany
The collapse transitions of aqueous PNIPAM solutions are investigated by the novel technique of Temperature Modulated Optical Refractometry (TMOR) as a function of temperature and time. In addition to the refractive index, TMOR yields information about the real and imaginary part of the thermo-optical coefficient and the volume coefficient of thermal expansion. Since all these physical quantities couple rather directly to the order parameter of the collapse or volume phase transition, they are able to shed new light on the structure formation during the collapse phase of aqueous PNIPAM solutions on a mesoscopic and macroscopic scale.