Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 189, Issue -, Pages 57-62Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2013.05.022
Keywords
MD simulations; Thermo-responsive polymers; Aqueous solutions
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We report first results of a systematic study of the properties of thermo-responsive polymer chains of poly(N-isopropylacrylamide) (PNIPAM), which are endgrafted onto the inner surfaces of a slab pore of approximately 9 nm width. We have systematically varied the strength of the PNIPAM-surface interaction energy to estimate the variation of the extent of the thermo-responsive effect on different surfaces. For weak to intermediate PNIPAM-surface interactions, the MD simulations show thermo-responsive behavior as characteristic changes of the radius of gyration and other measures of the polymer structure and polymer-water interactions, when comparing simulations below (at 280 K) and above (at 320 K) the lower critical solution temperature of PNIPAM, which is at 305 K. When the PNIPAM-surface interactions become stronger, the polymer loses its thermo-responsive behavior and is adsorbed flatly on the pore walls at both investigated temperatures. (C) 2013 Elsevier B.V. All rights reserved.
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