Abstract
The copolymers of ethylene with 5-ethylidene-2-norbornene containing 10–65% of the cyclic comonomer have been prepared with the use of three ansa-metallocene catalysts, namely, Et[Ind]2ZrCl2-methylaluminoxane, Et[IndH4]2ZrCl2-methylaluminoxane, and Me2Si[Ind]2ZrCl2-methylaluminoxane. Side groups >C=CH-CH3 capable of participation in the ozonolysis reaction have been incorporated into polymer chains via the copolymerization of ethylene with the cyclic comonomer. As evidenced by DSC, and X-ray diffraction, and very cold neutron scattering measurements of the supramolecular structure of the copolymers, the enrichment of the copolymer with the cyclic comonomer causes transformation of the ethylene-5-ethylidene-2-norbornene copolymer from the semicrystalline state to the amorphous state. This effect is accompanied by an increase in the density and optical transparency of the material and a rise in its glass transition temperature. Among the copolymers under study, the highest T g (83°C) is exhibited by the copolymer synthesized with the Et[Ind]2ZrCl2-methylaluminoxane catalyst and containing 30 mol % 5-ethylidene-2-norbornene.
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Original Russian Text © I.N. Meshkova, V.G. Grinev, E.V. Kiseleva, L.N. Paspopov, S.P. Kuznetsov, A.I. Udovenko, A.N. Shchegolikhin, T.A. Ladygina, L.A. Novoskhonova, 2007, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2007, Vol. 49, No. 11, pp. 1905–1914.
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Meshkova, I.N., Grinev, V.G., Kiseleva, E.V. et al. Polymer materials based on ethylene copolymers with substituted norbornene. Polym. Sci. Ser. A 49, 1165–1172 (2007). https://doi.org/10.1134/S0965545X07110041
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DOI: https://doi.org/10.1134/S0965545X07110041