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V. Noskova, L.N. Russiyan, P.Ye. Matkovskii



Features of copolymerization of ethylene with acetylene on complex organometallic catalysts (in English)

Polimery 1998, No 3, 155


DOI: dx.doi.org/10.14314/polimery.1998.155


Summary

Factors were studied that influence the kinetics of consumption of the comonomers in the copolymerization of ethylene with acetylene on vanadium- and titanium-containing complex catalysts, and the structure of the resulting products. The kinetic method showed the reactivity of acetylene to exceed in this process that of ethylene. The ethylene-acetylene copolymers (EAC) are colored; they contain conjugated and vinyl double bonds, react with ozone, bromine, iodine and maleic anhydride, are paramagnetic, and contain essential amounts of the crystalline phase. All these facts point out that they are block copolymers. Although nonelectroconductive, EAC are strongly electrified; they melt in the 80-140°C range, contain Essentials amounts of the crystalline phase both in the nascent state and in films: they are completely soluble in tetralin at 130°C and have low MFI values. Thermomechanical, calorimetric (DSC) and thermogravimetric data show EAC to be crosslinkable without initiators and accelerators. The acetylene blocks initiate crosslinking and operate both as a crosslinking agent and a fragment of the resulting structured material. The supermolecular structure, the structure and the strain-strength properties of EAC are similar to those of LDPE.


Keywords: copolymerization of ethylene with acetylene, organovanadium and titanium catalysts, ethylene-acetylene copolymers


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