2H-NMR study of the glass transition in supercooled ortho-terphenyl

Article abstract of DOI:10.1063/1.454047

The glass forming molecular liquid ortho-terphenyl has been investigated by 2H-NMR techniques providing spin-relaxation times (T₁, T₂), and spin-alignment data which yield information on the time scale and geometry of ultra-slow molecular reorientation.The main results are as follows: The primary glass transition (α process) is characterized by rotational molecular jumps with a jump size distribution weighted in favor of large jump angles, and by a distribution of correlation times.In addition intramolecular flip-flop jumps of the lateral phenyl rings are found which do not take part in the α process.Apart from this (secondary) intramolecular dynamics no residual small angle reorientation persists below T_g on the time scale (10^-4 to 10² s) of the spin-alignment experiment.

Full text of DOI:10.1063/1.454047

2HNMR study of the glass transition in supercooled orthoterphenyl
Th. Dries, F. Fujara, M. Kiebel, E. Rössler, and H. Sillescu
Citation: The Journal of Chemical Physics 88, 2139 (1988); doi: 10.1063/1.454047
View online: http://dx.doi.org/10.1063/1.454047
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/88/4?ver=pdfcov
Published by the AIP Publishing
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(1988)]
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141.212.109.170 On: Mon, 22 Dec 2014 14:03:15

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.212.109.170 On: Mon, 22 Dec 2014 14:03:15

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.212.109.170 On: Mon, 22 Dec 2014 14:03:15

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.212.109.170 On: Mon, 22 Dec 2014 14:03:15

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.212.109.170 On: Mon, 22 Dec 2014 14:03:15

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.212.109.170 On: Mon, 22 Dec 2014 14:03:15

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.212.109.170 On: Mon, 22 Dec 2014 14:03:15

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.212.109.170 On: Mon, 22 Dec 2014 14:03:15