High Speed Electron Spin Resonance Studies of Free Radicals in Stressed Polymers.
Annual summary rept. 1 Oct 76-30 Sep 77,
NAVAL RESEARCH LAB WASHINGTON D C
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It has been known for some time that mechanical stressing of a polymer is accompanied by bond rupture. The number of bonds ruptured is dependent on the sample morphology, the method of mechanical degradation, and the temperature relative to T sub G. If a sufficient number of bonds rupture, the free radicals thus formed are detectable using electron spin resonance ESR techniques. The information which has been uncovered in the extensive ESR studies of polymer fracture is outlined. Employment of microsecond response time ESR instrumentation is proposed for characterizing the sequence of radical reactions triggered by polymer fracture above cryogenic temperatures. Author
- Polymer Chemistry