Abstract:
Here, we systematically study the effects of different molecular weights of added homo-polystyrenes (hPS) on the phase behavior in films of two initial film thicknesses for blends of a weakly segregated polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) with hPS of various contents [1-3]. To demonstrate the chain distribution of homopolymers within perforated layers in PS-b-PMMA-rich films by neutron reflectivity (NR), deuterated PS of two different molecular weights were used instead of hPS. This study is outlined as follows. We first characterize structural details and surface morphologies in blend films by real-space imaging and reciprocal-space scattering. Second, the morphologies and lattice packing of the obtained phases as a function of PS molecular weights and contents in blend films are explained.