Abstract
The thermal decomposition of polyethylene and butadiene rubber chains in the presence of a tensile force acting along the axis of the molecule was simulated. The reaction of an isolated chain was considered. The chain models were the octane and 2,6-octadiene molecules. A deformation was introduced in the problem by fixing nonequilibrium distances between the terminal carbon atoms. The reaction coordinate (the middle C–C bond length R) was scanned at a fixed length of the molecule (L). That is, the potential energy surface section of the reaction was constructed at L = const. The reaction sensitivity to deformation was evaluated by B3LYP, LC-ωPBE, CCSD(T), CASSCF, and MP2 quantum-chemical calculations. All these calculations showed that the molecule elongated by ~1 Å for polyethylene, but shortened by 0.3–0.5 Å for 2,6-octadiene during chain scission. This means that the tensile deformation accelerates the decomposition of polyethylene, but decelerates the decomposition of butadiene rubber.
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Original Russian Text © B.E. Krisyuk, E.A. Mamin, A.A. Popov, 2018, published in Khimicheskaya Fizika, 2018, Vol. 37, No. 4, pp. 82–90.
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Krisyuk, B.E., Mamin, E.A. & Popov, A.A. Quantum-Chemical Study of Stressed Polyethylene and Butadiene Rubber Chain Scission. Russ. J. Phys. Chem. B 12, 300–307 (2018). https://doi.org/10.1134/S1990793118020185
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DOI: https://doi.org/10.1134/S1990793118020185