caa a22 4500 475764838 CHVBK 20180406123602.0 cr unu---uuuuu 170329e20000501xx s 000 0 eng 10.1007/s003960050536 doi (NATIONALLICENCE)springer-10.1007/s003960050536 A self-diffusion study in aqueous solution and lyotropic mesophases of amphiphilic block copolymers [Elektronische Daten] [L. Coppola, C. Oliviero, L. Pogliani, G. A. Ranieri, M. Terenzi]  Water-soluble poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PPO) triblock copolymers are high-molecular-weight nonionic copolymers and form micellar solutions and liquid-crystalline mesophases in water. We studied the temperature dependence of polymer and water self-diffusion in solutions and lyotropic mesophases of the PEO13 PPO30 PEO13/water and PEO21 PPO47 PEO21/water binary systems. The self-diffusion measurements were performed by means of the pulsed field gradient spin-echo NMR method. The analysis of the water mobility was realised using "the obstruction factor” and "the two-site model”, which consider the reduction of the water self-diffusion due to the microstructure of the lyotropic aggregates and to the presence of one part of the solvent bound to the polymer aggregate surfaces. We calculated the water obstruction factors and the hydration numbers as a function both of the polymer composition and of the temperature. The results are compared with the data obtained in mesophases formed by classical surfactants. Springer-Verlag Berlin Heidelberg, 2000 Key words Poly(ethylene oxide) nationallicence poly(propylene oxide) nationallicence poly(ethylene oxide) nationallicence Micellar solutions nationallicence Hexagonal and lamellar mesophases nationallicence Pulsed field gradient spin-echo nuclear magnetic resonance experiments nationallicence Micellar self-diffusion nationallicence Coppola L. Department of Chemistry University of Calabria Arcavacata di Rende Cosenza, Italy e-mail: l.coppola@unical.it, IT aut Oliviero C. Department of Chemistry University of Calabria Arcavacata di Rende Cosenza, Italy e-mail: l.coppola@unical.it, IT aut Pogliani L. Department of Chemistry University of Calabria Arcavacata di Rende Cosenza, Italy e-mail: l.coppola@unical.it, IT aut Ranieri G. A. Department of Chemistry University of Calabria Arcavacata di Rende Cosenza, Italy e-mail: l.coppola@unical.it, IT aut Terenzi M. Department of Chemistry University of Calabria Arcavacata di Rende Cosenza, Italy e-mail: l.coppola@unical.it, IT aut https://doi.org/10.1007/s003960050536 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050536 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Coppola L. Department of Chemistry University of Calabria Arcavacata di Rende Cosenza, Italy e-mail: l.coppola@unical.it, IT aut NATIONALLICENCE 700 1- Oliviero C. Department of Chemistry University of Calabria Arcavacata di Rende Cosenza, Italy e-mail: l.coppola@unical.it, IT aut NATIONALLICENCE 700 1- Pogliani L. Department of Chemistry University of Calabria Arcavacata di Rende Cosenza, Italy e-mail: l.coppola@unical.it, IT aut NATIONALLICENCE 700 1- Ranieri G. A. Department of Chemistry University of Calabria Arcavacata di Rende Cosenza, Italy e-mail: l.coppola@unical.it, IT aut NATIONALLICENCE 700 1- Terenzi M. Department of Chemistry University of Calabria Arcavacata di Rende Cosenza, Italy e-mail: l.coppola@unical.it, IT aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer