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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Poster Session 3

CPP 54.28: Poster

Thursday, April 3, 2014, 15:00–19:00, P2

Aggregation behaviour of doubly thermo-responsive poly(sulfobetaine-b-(N-isopropylmethacrylamide) diblock copolymers — •Natalya Vishnevetskaya¹, Viet Hoang², Andre Laschewsky², and Christine Papadakis¹ — ¹TU München, Physikdepartment, Physik weicher Materie — ²Institute of Chemistry, University of Potsdam

Diblock copolymers consisting of a thermo-responsive poly(N-isopropylmethacrylamide) (P(NIPMAM) block) and a zwitterionic poly(sulfobetaine) (P(SB) block) feature both a lower and an upper critical solution temperature in aqueous solution. This is expected to result in transitions from micelles to unimers to reverse micelles as temperature is increased. The self-organization of the diblock copolymers (P(SPP-b-NIPMAM)) in water can be varied by the addition of an electrolyte, resulting in combined UCST-LCST transitions.

The dependence of the phase transition temperatures in aqueous solution on the electrolyte concentration is investigated by means of turbidimetry. The aggregation behavior in aqueous solution with dual stimuli (temperature and electrolyte concentration) is studied by temperature-resolved small-angle neutron scattering, dynamic light scattering (DLS) and fluorescence correlation spectroscopy (FCS).