Effect of Functionalized Multiwalled Carbon Nanotubes on Dewetting Dynamics of Thin Film Polymer Bilayers
We investigated the effect of functionalized multi-walled carbon nanotubes (f-MWNTs) on the liquid–liquid dewetting dynamics of thin film polymer bilayers, namely, polystyrene (PS) thin films on poly(methyl methacrylate) (PMMA) substrates. We calculated the viscosity of the lower PMMA layer from the Wyart dewetting model for the liquid–liquid system. The Results show that the viscosity of the PMMA layer is enhanced upto more than three times by adding 0.15 wt% f-MWNTs. By combination of atomic force microscope (AFM) results, we found that the f-MWNTs were able to hinder a mobility of polymer in long range motion upon hole growing. However, diffusion dynamics results from a neutron reflectivity measurement show that f-MWNTs do not affect the diffusion coefficient of the PMMA due to the large network size of nanotubes.
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