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Formation of aldehyde groups during the photolysis of poly(methyl methacrylate)

✍ Scribed by P.M. Fritz; Q.Q. Zhu; W. Schnabel

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 233 KB
Volume: 30
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(94)90147-3

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✦ Synopsis

Almtract--Upon u.v. irradiation at 2in c = 253.7 nm poly(alkyl acrylates) and poly(alkyl methacrylates) form a new absorption band around 280 nm. This band is assigned at least partly to aldehyde groups attached to the main-chain. Aldehyde groups formed upon irradiation of poly(methyl methacrylate) were converted to 2,4-dinitrophenylhydrazone groups and detected by absorption spectroscopy performed in conjunction with gel permeation chromatography. Quantum yields of carbonyl groups capable of reacting with 2,4-dinitrophenylhydrazine were determined: t# (CO) = 4.4 x 10 -4 (argon) and ~b (CO) = 8.0 x 10 -4 (air).

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