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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Poster Session III

CPP 50.44: Poster

Dienstag, 17. März 2020, 14:00–16:00, P1C

Cononsolvency-induced collapse transitions in thin PMMA-b-PNIPAM and PMMA-b-PNIPMAM films — •Julija Reitenbach¹, Christina Geiger¹, Cristiane Henschel², André Laschewsky², Christine M. Papadakis³, and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching, Germany — ²Fraunhofer-Institut für Angewandte Polymerforschung, 14476 Potsdam-Golm, Germany — ³TU München, Physik-Department, Physik weicher Materie, 85748 Garching

Thin films of the thermoresponsive diblock copolymers PMMA-b-PNIPAM and PMMA-b-PNIPMAM both exhibit cononsolvency-induced collapse transitions when organic cosolvents are introduced into the surrounding atmosphere. The chemical structures of NIPAM (N-isopropylacrylamide) and NIPMAM (N-isopropylmethacrylamide) differ by a methyl functional group, which is able to influence the film collapse kinetics on a macroscopic scale. We reveal the solvent/cosolvent exchange taking place at the polymer functional groups with FTIR and attribute key changes in the local chemical environment to the macroscopic film collapse stages.