The kinetics of the photochemical reduction of anthracene groups attached to macromolecules in the presence of p-toluidine

Kozel, S.P.; Lashkov, G. I.; Gotlib, Yu.Ya.; Krakovyak, M. G.; Lushchik, V. B.; Skorokhodov, S. S.

doi:10.1016/0032-3950(78)90123-5

Cited by 2 publications

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This information should be useful to analyze the reactions occurring at higher concentrations. Previous studies of relevance which have dealt with the photodimerization of polymer-bound anthryl groups in solution include those by Tazuke and Banba, who treated various oligomeric polyesters, by Kozel and Lashkov, who observed intramolecular reactions, and by Hargreaves and Webber, who noted the photodecomposition of carbonyl chromophores. Regarding the problem of photodecomposition, Fox and Britt have found no low-mass photoproducts cleaved from poly(2-(9-anthryl)ethyl methacrylate), suggesting the absence of undesirable side reactions in this polymer.…”

Section: Introductionmentioning

confidence: 99%

Gelation Processes of Polymer Solutions. 1. Photodimerization of Free and Polymer-Bound Anthryl Groups

et al. 1996

View full text Add to dashboard Cite

A copolymer of 2-(9-anthrylmethoxy)ethyl methacrylate with methyl methacrylate (M w = 3.1 × 105, anthryl content = 0.8 mol %) and a low-mass model compound were studied with respect to their photodimerization or photo-cross-linking processes in tetrahydrofuran solution. The number of dimers or cross-links formed by ultraviolet (UV) irradiation was determined by UV absorption spectroscopy. A kinetic study on the model compound indicated the existence of a small amount of side reaction, which should be taken into consideration for a quantitative analysis. The concentration dependence of the initial quantum yield of photo-cross-linking of the polymer suggested that, below the overlap concentration c*, the intramolecular cross-linking predominates, while at c > c*, the contribution of intermolecular cross-linking increases with increasing c. This was directly confirmed by the light scattering measurements of the molecular weight and radius of gyration of the irradiated polymer. For a 10 wt % solution (c/c* ≈ 4), the critical number of cross-links, L g, of gelation was determined to be about 1.0 per chain, of which the intermolecular contribution is estimated to be ∼0.33. This value is fairly close to the Flory−Stockmayer theoretical prediction (about 0.24).

show abstract

Section: Introductionmentioning

confidence: 99%