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Transient entanglement behaviour in a poly(propylene glycole) melt: A field gradient NMR self-diffusion study

Abstract  We report measurements of the temperature dependence of the self-diffusion of a poly(propylene glycole) in the melt. Two kinds of magnetic field gradient NMR are used: pulsed field gradient NMR with large field gradients and static field gradient NMR in a specially designed cryomagnet. The... Full description

Contributors: Appel, M.
Fleischer, G.
Kärger, J.
Chang, I.
Fujara, F.
Schönhals, A.
Sekundärausgabe Online edition, Springer Online Journal Archives 1860-2002 ; 041039-1
Contained in: Colloid & polymer science : official journal of the Kolloid-Gesellschaft Vol. 275 (1997), p. 187-191
Journal Title: Colloid & polymer science : official journal of the Kolloid-Gesellschaft
Fulltext access: Fulltext access (direct link*) 10.1007/s003960050070
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Links: Additional Link (dx.doi.org)
ISSN: 1435-1536
Keywords: Key words Poly(propylene)glycole
dielectric relaxation
field gradient NMR
self-diffusion
transient entanglements
DOI: 10.1007/s003960050070
Language: English
Notes: Copyright: Copyright 1997 Steinkopff Verlag
Physical Description: Online-Ressource
PPN (Catalogue-ID): NLEJ208803246
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520 |a Abstract  We report measurements of the temperature dependence of the self-diffusion of a poly(propylene glycole) in the melt. Two kinds of magnetic field gradient NMR are used: pulsed field gradient NMR with large field gradients and static field gradient NMR in a specially designed cryomagnet. The emphasis is put on large field gradients. The (true) long-time self-diffusion coefficients are compared with those calculated from normal-mode relaxation times in dielectric spectroscopy using the Rouse model. They agree very well. For temperature below about 270 K, a time-dependent self-diffusion coefficient appears which is an indication of anomalous diffusion. At 253 K we observe complete transient entanglement behaviour of the PPG melt. These results are discussed in comparison with dielectric and other experimental data. 
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