Phase separation in semidilute aqueous poly(N-isopropylacrylamide) solutions.
作者： Andreas Meier-Koll , Vitaliy Pipich , Peter Busch , Christine M. Papadakis , Peter Müller-Buschbaum
DOI: 10.1021/LA3015332
关键词: Neutron diffraction 、 Bound water 、 Crystallography 、 Neutron scattering 、 Poly(N-isopropylacrylamide) 、 Aqueous solution 、 Phase transition 、 Thermodynamics 、 Temperature jump 、 Critical exponent 、 Chemistry
摘要: The phase separation mechanism in semidilute aqueous poly(N-isopropylacrylamide) (PNIPAM) solutions is investigated with small-angle neutron scattering (SANS). nature of the transition probed static SANS measurements and time-dependent after a temperature jump. observed critical exponents describing dependence Ornstein–Zernike amplitude correlation length are smaller than values from mean-field theory. Time-dependent show that specific surface decreases increasing time jump above transition. Thus, formation additional hydrogen bonds collapsed state kinetic effect: A certain fraction water remains as bound system. Moreover, H–D exchange reactions PNIPAM have to be taken into account.
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