Temperature Behavior of Aqueous Solutions of Poly(2-oxazoline) Homopolymer and Block Copolymers Investigated by NMR Spectroscopy and Dynamic Light Scattering.
作者： Rafał Konefał , Peter Černoch , Magdalena Konefał , Jiří Spěváček , None
关键词: Materials science 、 Dynamic light scattering 、 Crystallography 、 Lower critical solution temperature 、 Nuclear magnetic resonance spectroscopy 、 Two-dimensional nuclear magnetic resonance spectroscopy 、 Phase transition 、 Proton NMR 、 Copolymer 、 Phase (matter)
摘要: 1H NMR methods in combination with dynamic light scattering were applied to study temperature behavior of poly(2-isopropyl-2-oxazoline) (PIPOx) homopolymer as well PIPOx-b-poly(2-methyl-2-oxazoline) (PMeOx) and poly(2-ethyl-2-oxazoline) (PEtOx)-b-PMeOx diblock copolymers aqueous solutions. spectra showed a different way phase transition for the main side chains PIPOx-based Additionally, is irreversible PIPOx partially reversible PIPOx-b-PMeOx copolymer. As revealed by NMR, PEtOx-based solutions exists despite absence solution turbidity. It very broad, virtually independent copolymer composition some hysteresis. Two types water molecules detected above transition—“free” long “bound” short spin–spin relaxation times T2. NOESY information about conformational changes observed already pre-transition region solution.
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