Local and global dynamics in the glass-forming di-isobutyl phthalate as studied by 1H NMR

Spin-lattice relaxation times T 1 and T 1 ρ as well as 1H NMR spectra have been employed to study the dynamics of the glass-forming di-isobutyl phthalate in the temperature range extending from 100 K, through the glass transition temperature T g , up to 340 K. Below T g NMR relaxation is governed by...

Full description

Saved in:
Bibliographic Details
Published in:Solid state nuclear magnetic resonance 1997-02, Vol.7 (4), p.313-317
Main Authors: Glowinkowski, S., Jurga, S., Suchanski, W., Szczesniak, E.
Format: Article
Language:English
Subjects:
Dibutyl Phthalate - analogs & derivatives
Dibutyl Phthalate - chemistry
Distribution of correlation times
Glass
Magnetic Resonance Spectroscopy
Molecular dynamics
NMR
Relaxation times
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Spin-lattice relaxation times T 1 and T 1 ρ as well as 1H NMR spectra have been employed to study the dynamics of the glass-forming di-isobutyl phthalate in the temperature range extending from 100 K, through the glass transition temperature T g , up to 340 K. Below T g NMR relaxation is governed by local dynamics and may be attributed to rotation of methyl groups at low temperatures and to motion of isobutyl groups in the intermediate temperature interval. Above T g the main relaxation mechanism is provided by overall molecular motion. The observed relaxation behavior is explained by motional models assuming asymmetrical distributions of correlation times. The motional parameters obtained from Davidson-Cole distribution, which yields the best fit of the data at all temperatures are given.
ISSN:0926-2040
1527-3326
DOI:10.1016/S0926-2040(96)01266-0