Spatial heterogeneity in glassy polystyrene detected by deuteron NMR relaxation
No Thumbnail Available
Date
1999-02-27
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley-VCH
Abstract
Using deuteron NMR, the dynamics of supercooled polystyrene-d3 was investigated near the calorimetric glass transition. At these temperatures non-exponential spin lattice relaxation is found, indicating the presence of spatial heterogeneity. With increasing temperature, structural relaxation becomes fast enough to average efficiently over different spatial environments, leading to exponential magnetization decays. A qualitative comparison with toluene as a representative of a low molecular weight glass former is carried out. Indications are found that in polystyrene the observed averaging process is more effective at Tg than it is in toluene.
Description
Table of contents
Keywords
Citation
Döß, A.; Hinze, G.; Diezemann, G.; Böhmer, R.; Sillescu, H: Spatial heterogeneity in glassy polystyrene detected by deuteron NMR relaxation. In: Acta Polymerica Nr. 1, Jg. 49(1998), S. 56-58, doi: 10.1002/(SICI)1521-4044(199801)49:1<56::AID-APOL56>3.0.CO;2-7.