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Neutron spin echo investigations on molecular motion in polymers

โœ Scribed by D. Richter

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
815 KB
Volume
180-181
Category
Article
ISSN
0921-4526

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โœฆ Synopsis

Neutron spin echo spectroscopy allows the observation of long range internal relaxation mechanisms of macromolecules, simultaneously in space and time. Thereby. it facilitates a microscopic study of the molecular origins of the macroscopic viscoelastic properties of polymer materials. The molecular understanding of polymer dynamics bases on concepts of entropic forces and topological and hydrodynamic interactions. I shall briefly outline the different concepts and then discuss experimental results on these different aspects of polymer motion on a molecular scale.

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## Abstract The spinโ€probe technique was employed to study molecular motion in collagen and modified collagen samples in the โˆ’160ยฐ to +200ยฐC region. The effect of water content in the 0โ€“30โ€wt. % range, relative to vacuum dried samples, on the electron spin resonance spectrum of the probe was also i