Reference

Effect of copper metal powder and some of its salts on the aqueous polymerization of methyl methacrylate and on the tacticity of obtained polymers

Effect of copper metal powder and some of its salts on the aqueous polymerization of methyl methacrylate and on the tacticity of obtained polymers. Moustafa, A. B.; Abd El-Ghaffar, M. A.; Badran, A. S. (Lab. Polym. Pigments, Natl. Res. Cent., Dokki/Cairo, Egypt). Acta Polym., 35(1), 68-70 (English) 1984. CODEN: ACPODY. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) The no.-av. mol. wt. of poly(Me methacrylate) [9011-14-7] prepd. in H2O using NaHSO3 catalyst in the presence of Cu decreased in the order no Cu > Cu metal > CuCl2 > Cu2Cl2 > Cu(OAc)2 [142-71-2] > Cu(NO3)2 > CuSO4. 7440-50-8 and 7758-89-6 are cas registry numbers of chemicals which are used as reagents here. Polydispersity in the presence of Cu phthalocyanine [147-14-8] and Cu (biphthalocyanine) [29132-42-1] was the same, but mol. wt. with the latter was ~24% higher. No.-av. mol. wt. decreased with increasing initiator to a min. and then increased. Mol. wt. and polydispersity in polymn. in the presence of NaCl were the same as those in its absence, confirming a radical mechanism. .

Catalytic action of copper acetate on styrene polymerization in the presence of water

Catalytic action of copper acetate on styrene polymerization in the presence of water. Nikolaev, A. F.; Belogorodskaya, K. V.; Kryzhanovskii, A. V.; Suvorov, A. V. (Leningr. Tekhnol. Inst., Leningrad, USSR). Dokl. Akad. Nauk SSSR, 274(1), 121-3 [Phys. Chem.] (Russian) 1984. CODEN: DANKAS. ISSN: 0002-3264. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Data for the polymn. of styrene (I) [100-42-5] in the presence of Cu(OAc)2 (II) [142-71-2] catalyst, F3CCO2H [76-05-1] cocatalyst, and significant amts. of H2O (exceeding the molar concn. of II by more than an order of magnitude) showed that metal salts can exert a direct catalytic effect on the cationic polymn. of I in the presence of H2O if the reaction of I with the cocatalyst includes an intermediate stage in which a highly polarized compd. is formed.In this experiment, several chemicals are used like 76-05-1 and 7732-18-5 EPR and 1H-NMR data indicated that paramagnetic aquo complexes of Cu were converted during polymn. to diamagnetic dimers through complexation of the Cu with intermediate compds. formed in the polymn. .