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Transient species in pulse-irradiated poly(methyl methacrylate) pure and doped with pyrene

✍ Scribed by M. Szadkowska-Nicze; M. Kiszka; J. Mayer

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
721 KB
Volume
35
Category
Article
ISSN
0887-624X

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✦ Synopsis

The spectra of transients produced in pulse-irradiated pure poly(methyl methacrylate), PMMA, at room and -130 K temperatures were measured. The intermediates were identified as PMMA radicals and radical anions. In the pulse-irradiated PMMA-pyrene (Py) system the solute excited states and radical ions were produced. Scavenging of negative charges by Py was directly observed at 130 K in a ps time scale. Py fluorescence was found to be produced mainly as a result of Cerenkov photoexcitation. At room temperature, some contribution of ionic mechanism to Py fluorescence formation was found. ~1997.JohnWiley & Sons, Inc. Keywords: poly(methylmethacrylate) q pulse radiolysis q charge scavenging q doped polymers q excited states

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