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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 4: Interfaces and Thin Films
CPP 4.8: Talk
Monday, March 18, 2024, 11:30–11:45, H 0111
Making stable thin nanoporous polymer films — •Hsiao-Ping Hsu and Kurt Kremer — Max-Planck-Institut für Polymerforschung, Mainz, Germany
Thin polymer films have attracted much attention due to their usefulness as supporting media in tissue engineering or as membranes in the separation processes. Thus a simulation guides processing is highly desirable. Starting from a fully equilibrated free-standing thick film of highly entangled polymer melts based on a weakly semiflexible bead-spring model [1], we apply a simple “biaxial expansion” deformation mechanism to stretch the film. For the present study the film is of thickness of several radii of gyration of the chains and the glass transition temperature Tg is the same as in the bulk case [2]. We analyze the local morphology, the void formation and its stabilization upon cooling after expansion all the way well below Tg. Motivated by these simulations a similar process is applied experimentally on films of highly entangled polystyrene and compared to simulations. Our results show an excellent qualitative and even semi-quantitative agreement [3].
[1] H.-P. Hsu, K. Kremer, J. Chem. Phys. 150, 091101 (2019); 153, 144902 (2020).
[2] H.-P. Hsu, K. Kremer, J. Chem. Phys. 159, 071104 (2023).
[3] H.-P. Hsu, M. K. Singh, Y. Cang, H. Thérien-Aubin, M. Mezger, R. Berger, I. Lieberwirth, G. Fytas and K. Kremer, Adv. Sci. 10, 2207472 (2023).
Keywords: Free-standing Polymer Film; Mechanical Deformation; Porosity; Polymer Glass