Metallocene catalysis in the complex-radical polymerization of methyl methacrylate |
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| Authors: | Email author" target="_blank">N?N?SigaevaEmail author A?K?Friesen I?I?Nasibullin N?L?Ermolaev S?V?Kolesov |
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| Institution: | 1.Institute of Organic Chemistry, Ufa Scientific Center,Russian Academy of Sciences, Ufa,Bashkortostan,Russia;2.Institute of Applied Physics,Russian Academy of Sciences,Nizhni Novgorod,Russia |
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| Abstract: | The initiation stage of methyl methacrylate polymerization in the presence of benzoyl peroxide-metallocene (MC) systems is considered, with MC = Cp2Fe, (C5Me5)2Fe, (AcC5H4)(C5H5)Fe, Cp2TiCl2, Cp2ZrCl2, and (C5Me5)2ZrCl2. The decomposition of benzoyl peroxide in the presence of a metallocene proceeds via the formation of its complex with the metallocene. The catalytic effect of the metallocenes on the initiation of methyl methacrylate polymerization is due to the formation of a metallocene-benzoyl peroxide complex and its decomposition yielding primary radicals. The chain propagation stage is metallocene-dependent, which is explained by the formation of complex sites. Their formation pathway and structures are analyzed using quantum-chemical calculations. |
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