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000201060 245__ $$aPhase Separation in Semidilute Aqueous Poly( N -isopropylacrylamide) Solutions
000201060 260__ $$aWashington, DC$$bACS Publ.$$c2012
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000201060 520__ $$aThe phase separation mechanism in semidilute aqueous poly(N-isopropylacrylamide) (PNIPAM) solutions is investigated with small-angle neutron scattering (SANS). The nature of the phase transition is probed in static SANS measurements and with time-dependent SANS measurements after a temperature jump. The observed critical exponents of the phase transition describing the temperature dependence of the Ornstein–Zernike amplitude and correlation length are smaller than values from mean-field theory. Time-dependent SANS measurements show that the specific surface decreases with increasing time after a temperature jump above the phase transition. Thus, the formation of additional hydrogen bonds in the collapsed state is a kinetic effect: A certain fraction of water remains as bound water in the system. Moreover, H–D exchange reactions observed in PNIPAM have to be taken into account.
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000201060 7001_ $$0P:(DE-Juel1)130893$$aPipich, Vitaliy$$b1
000201060 7001_ $$0P:(DE-HGF)0$$aBusch, Peter$$b2
000201060 7001_ $$0P:(DE-HGF)0$$aPapadakis, Christine M.$$b3
000201060 7001_ $$0P:(DE-HGF)0$$aMüller-Buschbaum, Peter$$b4$$eCorresponding Author
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