Abstract
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 molecular models applied for the explanation of macroscopic viscoelastic properties of polymer materials. After a short outline of the method, this paper discusses experimental results on chain relaxation in dilute solution of linear as well as of branched polymer chains choosing the star polymer as a prototype. Thereafter, chain motion in dense polymer systems under varying topological constraints is addressed. Results on concentrated solutions, melts and chains trapped in networks with different mesh sizes are presented and compared with theoretical models. Finally aspects of the dynamics of polymer networks are discussed and spin-echo results on the motion of labelled cross links are presented.
Published Version
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