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Polyolefins Journal، جلد ۱۰، شماره ۲، صفحات ۷۹-۸۸
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عنوان انگلیسی Polymerization of methyl methacrylate using bis(imine)cobalt, a polyolefin catalyst
چکیده انگلیسی مقاله A mono-nuclear catalyst of bis-imine cobalt (MC) was synthesized with using 2,6-dibenzhydryl-4-ethoxy phenyl as a ligand. The so huge ligand was prepared via the reaction of 2,6-dibenzhydryl-4-ethoxy phenyl)-N=(CH3)-C(CH3)=O with diacetyl with equal mole stoichiometry in presence of formic acid catalysis. The catalyst was synthesized via a reaction between the ligands and cobalt salt (CoCl2). The catalyst was used for polymerization of methyl methacrylate (MMA), (a polar monomer) in the presence of modified methylaluminoxane (MMAO). The highest polymerization activity (8.6 g PMMA/mmol cat. h) was obtained at [cocatalyst]/[catalyst]=1000:1 molar ratio and at room temperature reaction. For the prepared PMMA, Polymer with branching density of 263/1000C was obtained using 1H NMR technique calculation. The microstructure of one of the produced PMMA was as follow: 48% syndiotactic, 29% isotactic and 23% atactic. GPC analysis of the polymer showed a number average molecular weight of about 5.7 × 105 g/mol and a narrow molecular weight distribution of 1.57.
کلیدواژه‌های انگلیسی مقاله Bis-imine cobalt catalysis, polymethyl methacrylate, polymerization, tacticity
نویسندگان مقاله Majedeh Maroofi |
Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, P.O. Box 91775, Mashhad, Iran

Gholam Hossein Zohuri |
Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, P.O. Box 91775, Mashhad, Iran

Saeid Ahmadjo |
Department of Engineering, Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965/115, Tehran, Iran

Navid Ramezanian |
Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, P.O. Box 91775, Mashhad, Iran

نشانی اینترنتی http://poj.ippi.ac.ir/article_1943_d77ba8278ac6ef8640019533f9015803.pdf
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