Raman Structural Study of Random Copolymers
of Ethylene with 1-Hexene¹

Yu. V. Zavgorodnev^{a, b}, K. A. Prokhorov^a, L. A. Novokshonova^c, T. M. Ushakova^c,
E. E. Starchak^c, V. G. Krasheninnikov^c, G. Yu. Nikolaeva^a, *, E. A. Sagitova^{a, d},
P. P. Pashinin^a, M. A. Guseva^e, P. Donfack^d,
B. von der Kammer^d, and A. Materny^d

^a Prokhorov General Physics Institute, Russian Academy of Sciences,
ul. Vavilov 38, Moscow, 119991 Russia

^b “MATI”—Tsiolkovsky Russian State Technological University, Orshanskaya 3, Moscow, 121552 Russia

^c Semenov Institute of Chemical Physics, Russian Academy of Sciences,
ul. Kosygin 4, Moscow, 119991 Russia

^d Jacobs University, Center of Functional Materials and Nanomolecular Science, Bremen, Germany

^e Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences,
ul. Leninsky 29, Moscow, 119991 Russia

*e-mail: Nikolaeva@kapella.gpi.ru
**e-mail: homa1971@gmail.com

Received November 10, 2011; in final form, November 13, 2011; published online March 6, 2012

Abstract—Ethylene/1-hexene copolymers, which differ significantly in 1-hexene content (from 1.9 to
37.0mol %), are studied by Raman spectroscopy. The copolymer spectra are compared with the Raman spectra
of polyethylene at elevated temperatures. We have found that the phase and conformational order of the copol-
ymer macromolecules depends strongly on the 1-hexene content. In particular, an increase in 1-hexene content
leads to a decrease in content of the PE-like orthorhombic crystalline phase and in content of trans-conformers
in the amorphous phase. The Raman signature at about 800 cm^–1 provides information about the end conform-
ers for the ethylene/1-hexene copolymers with high 1-hexene content.

DOI: 10.1134/S1054660X12040305

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