Raman Structural Study of Random Copolymers
of Propylene with 1-Pentene¹

K. A. Prokhorov^a, G. Yu. Nikolaeva^a, E. A. Sagitova^a, A. A. Mischenko^a,
P. P. Pashinin^a, P. M. Nedorezova^b, A. N. Klyamkina^b, A. V. Chapurina^b,
A. A. Kovalchuk^c, and B. F. Shklyaruk^d

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

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

^c All-Russian Scientific Research Institute of Aviation Materials, State Research Center of the Russian Federation,
ul. Radio 7,, Moscow, 105005 Russia

^d Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences,
Leninskii pr. 29, Moscow, 119991 Russia

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

Received April 28, 2012; published online August 1, 2012

Abstract—Nascent form of random propylene/1-pentene copolymers was studied for the first time by Raman
spectroscopy. For the purpose of detailed interpretation of the copolymer spectra, we investigated Raman spec-
tra of neat PP with low and high crystallinity. It was found that the copolymer Raman spectra depend on the 1-
pentene content. We registered the most significant spectral alterations in two lines at 809 and 841 cm^–1. The
first line corresponds to vibrations of polypropylene (PP) isotactic chains in the crystalline phase, while the sec-
ond one is associated with vibrations of PP isotactic chains having isomeric defects. We found out that increase
in the 1-pentene content results in reduction of the copolymer crystallinity and in the content of isotactic chains
in the copolymer amorphous phase.

DOI: 10.1134/S1054660X12090162

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