Bimetallic systems for acrylamide photosensitized polymerization Part II. Cr^V^ICu^I^I, a suitable system to control the polymerization process - Mailhot, G.; Bolte, M. (Elsevier)
The polymerization of acrylamide was photoinitiated by HCrO^-"4 in aqueous solution; copper(II) as Cu(H"2O)^2^+"6 was used to control the polymerization process. In the concentration range of chromium(VI), in which the termination of the chain is mainly due, in the absence of copper, to mutual annihilation of the macroradicals, the addition fo copper(II) modifies the polymerization process. The rate of polymerization R"p was established to be proportional to the absorbed light intensity I"a, to be dependent on the square of the monomer concentration and to decrease when the copper(II) concentration was increased. The process of oxidative termination of the radicals by copper(II) was in agreement with the experimental results. The evolution of the polymer molecular weight as a function of the different parameters controlling the polymerization process was described.
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