Reference

Activity of some methylene compounds in radical polymerization of methyl methacrylate

Activity of some methylene compounds in radical polymerization of methyl methacrylate. Kaim, Andrzej (Dep. Chem., Univ. Warsaw, Warsaw 02-093, Pol.). J. Polym. Mater., 3(2), 73-7 (English) 1986. CODEN: JOPME8. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) The initiation of radical polymn. of Me methacrylate [80-62-6] in dioxane by cyclopentanone [120-92-3], cycloheptanone [502-42-1], acetylacetone [123-54-6], Et acetoacetate [141-97-9], diethyl malonate [105-53-3], or Et cyanoacetate (I) [105-56-6] catalyst could only occurred at temps. higher than a characteristic temp. (Ti) in which the overall catalytic polymn. rate is equal to the thermal polymn. rate. The Ti and polymn. activation energy increased with increasing pKa (acidity const.) of the catalysts with the exception of I.

Effect of impurities on the photochemical polymerization of ethyl a-cyanoacrylate

Effect of impurities on the photochemical polymerization of ethyl a-cyanoacrylate. Polyakova, A. M.; Said-Galiev, E. E.; Ashkhotova, L. M. (USSR). Plast. Massy, (10), 7-9 (Russian) 1986. CODEN: PLMSAI. ISSN: 0554-2901.There are some reagents with their cas registry numbers 7772-99-8 and 7085-85-0 are used in this study. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) The presence of small amts. of peroxide impurities in com. Et a-cyanoacrylate (I) [7085-85-0] inhibited the formation of active centers for photopolymn. Treatment of I with SnCl2 to remove the peroxides increased the rate of photopolymn. by 2.4-fold, increased polymer mol. wt. by 2.6-fold, and decreased the rate of thermal polymn. The activation energy (Ea) of photopolymn. was 29.33 kJ/mol for untreated I and 12.57 kJ/mol for SnCl2-treated I. The SnCl2 purifn. increased the Ea of thermal polymn. from 41.9 kJ/mol to 78.77 kJ/mol. The presence Et cyanoacetate [105-56-6] impurity in I had no influence on the rate of photopolymn. or on polymer mol. wt. .