13 C NMR spin–lattice relaxation times as a probeof local polymer dynamics in plasticized polyethers

Forsyth, M., Meakin, P. and MacFarlane, D. R. 1997, 13 C NMR spin–lattice relaxation times as a probeof local polymer dynamics in plasticized polyethers, Journal of materials chemistry, vol. 7, no. 2, pp. 193-203.

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Title 13 C NMR spin–lattice relaxation times as a probeof local polymer dynamics in plasticized polyethers
Formatted title 13 C NMR spin–lattice relaxation times as a probeof local polymer dynamics in plasticized polyethers
Author(s) Forsyth, M.
Meakin, P.
MacFarlane, D. R.
Journal name Journal of materials chemistry
Volume number 7
Issue number 2
Start page 193
End page 203
Publisher Royal Society of Chemistry
Place of publication Cambridge, England
Publication date 1997
ISSN 0959-9428
1364-5501
Summary 13C NMR spin–lattice relaxation times T1 are used to investigate the effect of low molecular weight diluents, including N,N-dimethylformamide, N-methylformamide, propylene carbonate, γ-butyrolactone, triglyme and tetraglyme, on the local polymer segmental motion in polyether–urethane networks. In all cases, an increase in the local mobility is deduced from the increasing T1 measurements consistent with a decreasing glass transition temperature. The extent of plasticization, however, is dependent on the nature of the small molecules. Those molecules which can either form strong polymer-diluent interactions (for example through dipolar interactions) or are themselves rigid, give the least enhancement of polymer mobility and the greatest deviation from the Fox equation for Tg. In the presence of alkali metal salts, N,N-dimethylformamide and propylene carbonate are shown to have opposite effects on the local polymer motion, as seen from the T1 measurements. In both cases, addition of the plasticizers increases the 13C T1 relaxation times for the plasticizer. However, propylene carbonate decreases the polymer 13C T1 whilst N,N-dimethylformamide results in the expected increase in polymer 13C T1.
Language eng
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1997, Royal Society of Chemistry
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030134

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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