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Role of Interfacial Interaction in Orientation of Poly(N-isopropylacrylamide) Chains on Silicon Substrate.

Studies of self-assembled PNIPAM films on hydrophilic and hydrophobic substrates that are grown below and above lower critical solution temperature (LCST) have been performed to understand the role of intramolecular and polymer–substrate interactions in self-assembly using near edge X-ray absorption fine structure (NEXAFS) spectroscopy, atomic-force microscopic (AFM) and density functional theory (DFT). The NEXAFS spectra suggest that the polymer chains are oriented similarly on hydrophilic as well as hydrophobic substrate although the chains were having different morphologies in the solution, whereas, AFM studies shows that the morphology of the polymer chains on the two substrates are widely different. NEXAFS absorption spectra for free molecule and that with effects of substrate were calculated using DFT. The results show that on hydrophobic substrate polymer–substrate interaction is stronger as compared to that with hydrophilic one, however, for both cases this interaction plays dominant role over the...

Authors:   C.-H. Wang; S. Mukherjee; A. K. M. Maidul Islam; Y.-W. Yang; M. Mukherjee
Journal:   Macromolecules
Year:   2011
DOI:   10.1021/ma200614w
Publication date:   24-Jun-2011
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