Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 27: Micro- and Nanopatterning

DS 27.5: Talk

Wednesday, March 18, 2015, 16:00–16:15, H 0111

Phase Segregated Domains of Polymer Blend Thin Films: Effect of Molecular Weight, Surface Energy and Topographic Confinement — •Nandini Bhandaru and Rabibrata Mukherjee — Indian Institute of Technology Kharagpur, Kharagpur, India

The phenomenon of spontaneous phase segregation of an immiscible polymer blend system is a major area of research as these surfaces can be potentially leveraged in a wide variety of applications like as templates in tissue engineering, organic solar cells, etc. Spin cast films of these blends show a variety of random structures depending on the composition of the two polymers, the film thickness as well as the nature of the substrate. In this work, poly(styrene) (PS)- poly(methylmethaacrylate) (PMMA) blend thin films of various concentrations and compositions were spin coated on flat as well as on different topographically patterned substrates and the phase segregated morphology all the cases are compared. Multiple parameters including the molecular weight of the polymers, the surface energy of flat and patterned substrates and nature of the topographic confinement were varied to obtain highly ordered multi-material nano structures. Also, the presence of patterns result in a certain reduction in the domain size for each of polymer component.