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Fatigue-effect on free radical decay in irradiated polymethyl methacrylate

✍ Scribed by Ferenc Szócs; Marta Klimová

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
221 KB
Volume
32
Category
Article
ISSN
0014-3057

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✦ Synopsis

The influence of material fatigue on molecular motion in polymethyl methacrylate (PMMA) was investigated by the ESR method. Free radicals served as molecular labels informing on changes in molecular dynamics. It has been found that the fatigue of PMMA accelerates the decay of free radicals. In the course of material fatigue new degrees of freedom of motion of polymer chains come into existence. An increase in free volume as well as its redistribution sets in, owing to cyclic stress of the polymer.

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