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p-Nitroacetanilide in the presence of triethylamine as a photoinitiator system for vinyl polymerization

✍ Scribed by M. V. Encinas; A. M. Rufs; E. Norambuena; C. Giannotti

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

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✦ Synopsis

The polymerization rate of methyl methacrylate photosensitized by p-nitroacetanilide in the presence of triethylamine was measured as a function of the amine and monomer concentrations. The polymerization proceeds readily in high-polarity media (acetonitrile/monomer) but is negligible in nonpolar media. The polymerization rate increases with the amine concentration up to 0.15M. Further increase in amine concentration does not change the polymerization rate. A similar behavior was observed for the photobleaching of the nitro compound. ESR studies show the formation of a nitro and an amine free radical, the latter free radical being the active species that adds to the monomer.

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