Analysis of Polarized Raman Spectra of Propylene-Olefin Copolymers
2025
Kuznetsov, S.
Presents the results of a study of polarized Raman spectra of films of statistical copolymers of propylene with olefins: 1-butene and 1-octene of various concentrations (from 0 to 30 mol%). The research methodology included recording polarized Raman spectra in two scattering geometries when excited by an argon-krypton laser with a wavelength of 488 nm. A detailed analysis of spectral characteristics in the region of valence vibrations of the C–C bonds and deformation vibrations of CH2 and CH3 groups was carried out. During the study, it was found that with an increase in the content of the added monomer, a monotonic change in spectral characteristics occurs. It has been shown that a more massive monomer (1-octene) more effectively prevents the formation of a polypropylene crystal phase compared to 1-butene. The main results demonstrate the dependence of the phase and conformational composition of copolymer molecules on the content of comonomers and the length of the side chain of the second monomer. The practical significance of the work lies in the development of methods for spectroscopic analysis of the structure of copolymers, which make it possible to characterize changes in their structure with high accuracy. The results obtained can be used to optimize the processes of synthesizing copolymers with desired properties.
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