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I. N. Meshkova, V. G. Grinev, E. B. Kiseleva, L. N. Raspopov, A.N. Shchegolikhin, S. P. Kuznetsov, A. V. Mitrofanov, S. V. Shestov, A. I. Udovenko, T. A. Ladygina, L. A. Novokshonova

Polyolefins functionalization by copolymerization of ethylene (propylene) with substituted norbornene (in English)

Polimery 2008, No 5, 345


DOI: dx.doi.org/10.14314/polimery.2008.345

Summary

A number of new copolymers of ethylene (propylene) and 5-ethylidene-2-norbornene (EN) containing 5-62 mol. % of the cyclic comonomer units in the main chain have been synthesized by employing of three ansa-metallocene catalytic systems, namely: Et[Ind]2ZrCl2/methylalumoxane, Et[IndH4]2ZrCl2/methylalumoxane or Me2Si[Ind]2ZrCl2/methylalumoxane. In this way side >C=CH-CH3 groups in the range up to 7·10-3 mol/g were incorporated into a structure of polyolefin chain. As it was found by IR-spectroscopy, the side ethylidene groups of poly(ethylene-co-5-ethylidene-2-norbornene) were susceptible to ozonolysis reactions and converted into the polar carbonylic groups. According to DSC, X-ray diffraction and very cold neutrons scattering (VCN) data, enrichment of poly(ethylene-co-5-ethylidene-2-norbornene) with EN units has lead to eventual transformation of the studied copolymers from a partly crystalline state to a fully amorphous one. With the growing cyclic comonomer partial content the copolymers have exhibited progressively better optical transparency and higher glass transition temperatures (up to 85°C); they are characterized by a high density (d>1000kg/m3).


Key words: metallocene catalysts, olefins, 5-ethylidene-2-norbornene, copolymerization, supramolecular structure, chemical structure, thermal properties, transparency


e-mail: lnow@chph.ras.ru


N. Meshkova, V. G. Grinev, E. B. Kiseleva, L. N. Raspopov, A.N. Shchegolikhin, S. P. Kuznetsov, A. V. Mitrofanov, S. V. Shestov, A. I. Udovenko, T. A. Ladygina, L. A. Novokshonova

Polyolefins functionalization by copolymerization of ethylene (propylene) with substituted norbornene (in English)