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024 7 _ |a 10.1021/la3015332
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024 7 _ |a 1520-5827
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037 _ _ |a FZJ-2015-03370
082 _ _ |a 670
100 1 _ |a Meier-Koll, Andreas
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245 _ _ |a Phase Separation in Semidilute Aqueous Poly( N -isopropylacrylamide) Solutions
260 _ _ |a Washington, DC
|c 2012
|b ACS Publ.
336 7 _ |a Journal Article
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520 _ _ |a The phase separation mechanism in semidilute aqueous poly(N-isopropylacrylamide) (PNIPAM) solutions is investigated with small-angle neutron scattering (SANS). The nature of the phase transition is probed in static SANS measurements and with time-dependent SANS measurements after a temperature jump. The observed critical exponents of the phase transition describing the temperature dependence of the Ornstein–Zernike amplitude and correlation length are smaller than values from mean-field theory. Time-dependent SANS measurements show that the specific surface decreases with increasing time after a temperature jump above the phase transition. Thus, the formation of additional hydrogen bonds in the collapsed state is a kinetic effect: A certain fraction of water remains as bound water in the system. Moreover, H–D exchange reactions observed in PNIPAM have to be taken into account.
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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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700 1 _ |a Pipich, Vitaliy
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700 1 _ |a Busch, Peter
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700 1 _ |a Papadakis, Christine M.
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700 1 _ |a Müller-Buschbaum, Peter
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773 _ _ |a 10.1021/la3015332
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