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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Poster Session II

CPP 25.48: Poster

Dienstag, 2. April 2019, 14:00–16:00, Poster B1

Mesoglobules in PNIPAM solutions: Influence of pressure — Bart-Jan Niebuur¹, •Geethu P. Meledam¹, Vitaliy Pipich², Marie-Sousai Appavou², Alfons Schulte³, and Christine M. Papadakis¹ — ¹TU München, Physik-Department, Garching, Germany — ²FZ Jülich, JCNS at MLZ, Garching, Germany — ³University of Central Florida, Orlando, U.S.A.

Poly(N-isopropylacrylamide) (PNIPAM) in aqueous solution forms mesoglobules upon heating through the cloud point, which are small and contain only little water. In contrast, at high pressure, much larger clusters are formed, which contain more water than at atmospheric pressure [1]. We use very small angle neutron scattering at temperatures above the cloud point to elucidate the transition between low and high pressures. We find a sharp transition between small mesoglobules and large clusters with the transition pressure depending on temperature. We attribute the pressure-dependent behavior on mesoscopic length scales to the pressure-dependent hydration of PNIPAM.
1. B.-J. Niebuur et al., ACS Macro Lett. 6, 1180 (2017)