caa a22 4500 475764730 CHVBK 20180406123602.0 cr unu---uuuuu 170329e20000501xx s 000 0 eng 10.1007/s003960050532 doi (NATIONALLICENCE)springer-10.1007/s003960050532 The influence of polymer molecular-weight distributions on pulsed field gradient nuclear magnetic resonance self-diffusion experiments [Elektronische Daten] [B. Håkansson, M. Nydén, O. Söderman]  The influence of polymer molecular-weight distributions on the outcome of pulsed field gradient (PFG) NMR self-diffusion experiments has been considered. The self-diffusion coefficient, D, of monodisperse poly(ethylene oxide) (PEO) polymers has been determined in order to accurately determine the scaling behavior of D both with molecular weight and concentration. In order to investigate the influence of polydispersity on the PFG NMR signal, a model system consisting of ten reasonably monodisperse PEO polymers was made, and the PFG NMR signal intensities were recorded at a low total concentration. The data were analyzed using both inverse Laplace transformation and nonlinear least-squares fitting to a prescribed distribution function of D. Finally, the molecular-weight distribution was obtained by use of the values of the scaling parameters. We also present some model calculations used to investigate the sensitivity of the degree of polydispersity on the NMR signal decays. Springer-Verlag Berlin Heidelberg, 2000 Key words Polymers nationallicence Poly(ethylene oxide) nationallicence Pulsed field gradient spin-echo nuclear magnetic resonance nationallicence Self-diffusion nationallicence Polydispersity nationallicence Håkansson B. Division of Physical Chemistry 1 Center for Chemistry and Chemical Engineering, Lund University P.O. Box 124, S-221 00 Lund, Sweden, SE aut Nydén M. Department of Applied Surface Chemistry Chalmers University of Technology S-412 96 Gothenburg, Sweden, SE aut Söderman O. Division of Physical Chemistry 1 Center for Chemistry and Chemical Engineering, Lund University P.O. Box 124, S-221 00 Lund, Sweden, SE aut https://doi.org/10.1007/s003960050532 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050532 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Håkansson B. Division of Physical Chemistry 1 Center for Chemistry and Chemical Engineering, Lund University P.O. Box 124, S-221 00 Lund, Sweden, SE aut NATIONALLICENCE 700 1- Nydén M. Department of Applied Surface Chemistry Chalmers University of Technology S-412 96 Gothenburg, Sweden, SE aut NATIONALLICENCE 700 1- Söderman O. Division of Physical Chemistry 1 Center for Chemistry and Chemical Engineering, Lund University P.O. Box 124, S-221 00 Lund, Sweden, SE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer