Published : 2022-08-23

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


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 7ź10-3 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).





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Meshkova, I. N., Grinev, V. G., Kiseleva, E. B., Raspopov, L. N., Shchegolikhin, A. N., Kuznetsov, S. P., Mitrofanov, A. V., Shestov, S. V., Udovenko, A. I., Ladygina, T. A., & Novokshonova, L. A. (2022). Polyolefins functionalization by copolymerization of ethylene (propylene) with substituted norbornene. Polimery, 53(5), 345-352. Retrieved from