Original Russian Text + R.M. Islamova, Yu.I. Puzin, V.A. Kraikin, A.A. Fatykhov, U.M. Dzhemilev, Yu.B. Monakov, 2006, published in Zhurnal Prikladnoi. Khimii ...
ISSN 1070-4272, Russian Journal of Applied Chemistry, 2006, Vol. 79, No. 9, pp. 1509!1513. + Pleiades Publishing, Inc., 2006. Original Russian Text + R.M. Islamova, Yu.I. Puzin, V.A. Kraikin, A.A. Fatykhov, U.M. Dzhemilev, Yu.B. Monakov, 2006, published in Zhurnal Prikladnoi Khimii, 2006, Vol. 79, No. 9, pp. 1525!1528.
ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
MACROMOLECULAR CHEMISTRY ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ AND POLYMERIC MATERIALS
Controlling the Polymerization of Methyl Methacrylate with Ternary Initiating Systems R. M. Islamova, Yu. I. Puzin, V. A. Kraikin, A. A. Fatykhov, U. M. Dzhemilev, and Yu. B. Monakov Institute of Organic Chemistry, Ufa Scientific Center, Russian Academy of Sciences, Ufa, Bashkortostan, Russia Ufa State Technical University of Oil, Ufa, Bashkortostan, Russia Institute of Petroleum Chemistry and Catalysis, Russian Academy of Sciences, Ufa, Bashkortostan, Russia
-
Received April 26, 2006
Abstract The effect of ternary initiating systems benzoyl peroxide3ferrocene33,6-bis(o-carboxybenzoyl)N-isopropylcarbazole and benzoyl peroxide3di-h5-indenylzirconium dichloride33,6-bis(o-carboxybenzoyl)-Nisopropylcarbazole on the radical polymerization of methyl methacrylate and on the heat resistance and microstructure of the resulting polymers was examined. DOI: 10.1134/S1070427206090229
The main goal of macromolecular chemistry is preparation of polymeric materials with required properties. This goal can be accomplished by performing the process in the presence of initiating systems that contain, along with other components, organometallic compounds [1]. Organic compounds of transition metals find growing use not only as catalysts of ioniccoordination polymerization of olefins and dienes, but also as agents controlling the radical polymerization of vinyl monomers [2]. It is known [335] that the use of certain metallocenes (ferrocene, titanocene dichloride, etc.) in combination with initiators [benzoyl peroxide, azobis(isobutyronitrile)] not only accelerates the polymerization, but also allows preparation of poly(methyl methacrylate) (PMMA) with a narrower molecular-weight distribution and increased content of syndiotactic seqeunces in the polymer chain.
systems are characterized by deceleration of the polymerization [8], which makes them hardly suitable for commercial production of polymeric materials. It can be expected that combination of a metallocene and a nitrogen-containing compound in one initiating system would not only preserve their stereoregulating functions but also accelerate the polymerization and improve the thermal characteristics of the polymers obtained. Here we report on the radical polymerization of methyl methacrylate (MMA) initiated by ternary systems benzoyl peroxide (BP)33,6-bis(o-carboxybenzoyl)-N-isopropylcarbazole (DCN)3ferrocene (FC) and BP3DCN3di-h5-indenylzicronium dichloride (DIZD) and on the heat resistance and microstructure of the resulting polymers.
At the same time, study of initiating systems containing heteroaromatic diketo carboxylic acids showed that they, especially 3,6-bis(o-carboxybenzoyl)-N-isopropylcarbazole, catalyze the decomposition of benzoyl peroxide [6]. The effect of 3,6-bis(o-carboxybenzoyl)-N-isopropylcarbazole on the microstructure of the polymer is so strong that it is manifested at concentrations 132 orders of magnitude lower than the peroxide concentration and exceeds the effect of metallocene systems [3, 4, 6, 7]. However, peroxide3nitrogen-containing compound 1509
o o < < Q S 2 !2 2Q
