Photoinitiation of methacrylate polymerization with an o-benzoquinone-amine system

• Published in: Polymer science. Series B 2014, Vol.56 (1), p.11-20
• Main Authors: Chesnokov, S. A., Cherkasov, V. K., Abakumov, G. A., Mamysheva, O. N., Zakharina, M. Yu, Shushunova, N. Yu, Chechet, Yu. V., Kuropatov, V. A.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Constraining; Conversion; Electronics; Monomers; Photopolymerization; Polymer Sciences; Polymerization; Polymethyl methacrylates; Quinones; Spectra
• ISSN: 1560-0904; 1555-6123
• DOI: 10.1134/S1560090414010011

The kinetic features of the photopolymerization of mono- and dimethacrylates in the presence of the binary initiating system comprising a substituted o -benzoquinone and a tertiary amine under the action of visible light are studied. In the case of methyl methacrylate, the limiting conversion of the monomer does not exceed 10%. The photopolymerization of oligo(ester methacrylates) yields a polymer glass with a monomer conversion of 60–90%. As is shown for a series of seven o -benzoquinones, the rate of photopolymerization increases with an increase in the volume of substituents in positions 3 and 6 of the quinoid ring of o -benzoquinone. It found that trialkylamines (dimethylethanolamine and dimethylcyclohexylamine) are more efficient as coinitiators of photopolymerization than N , N -dimethylaniline. For compositions based on 3,6-di- tert -butylbenzoquinone-1,2, the spectral-sensitivity range in the visible region is 400 to 650 nm with a maximum at 600 nm. This value coincides with the maximum of the absorption band of quinone, which corresponds to the S ( n → π*) electronic transition of carbonyl groups.