Regularity Bands Behaviour In Infrared Spectra Of Polymers With A Partly Disturbed Regular Structure

I. V. Kumpanenko; N. V. Chukhanov

doi:10.1117/12.969608

1 December 1989 Regularity Bands Behaviour In Infrared Spectra Of Polymers With A Partly Disturbed Regular Structure

I. V. Kumpanenko, N. V. Chukhanov

Proceedings Volume 1145, 7th Intl Conf on Fourier Transform Spectroscopy; (1989) https://doi.org/10.1117/12.969608
Event: Seventh International Conference on Fourier and Computerized Infrared Spectroscopy, 1989, Fairfax, VA, United States

Abstract

The behaviour of some of the regularity bands in IR spectra of polymers with a partly disturbed regular structure has been studied. According to the original Zerbi's classification the regularity bands may be assigned to the most IR activated vibrational state densities of individual regular segments in irregular polymer chains. In the case of the finite length regular helical (rim) macromolecules these bands are the superpositions of the overlapping more or less activated chain vibration bands concentrated near0.0 or0.2irm/n phase differences for adjacent repeat units equivalent atoms vibrations. The specific feature of many of these bands is their monotonic intensification and rather rapid approach of band peak intensity I to its limit value with the increase of the number of repeat units N in regular segment. The growth of I is due to both the increase of the integral intensity and the decrease of the bandwidth F. In some cases the peak frequencies of these bands either do not or only weakly depend on the regular segment length. General simple ex-pressions for the bandwidth and intensity dependences on N for these bands in terms of the repeat unit normal coordinates displacements have been obtained. For non-correlated chain mode coupling the expressions have been reduced to 11oc(T/N)1/2 and I ocN1/2(1-N /N) , respectively, where T is the temperature. The relations obtained have been applied to the study of the microstructure and IR spectra of styrene-styrene--d1, tetrahydrofurane-propylene oxide, ethylene -butene-1 and ethylene oxide-propylene oxide homo and block co-polymers. It is argued that the regularity band intensity carries information about the regular segment mean lengths and length distribution in homo and copolymers.

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I. V. Kumpanenko and N. V. Chukhanov "Regularity Bands Behaviour In Infrared Spectra Of Polymers With A Partly Disturbed Regular Structure", Proc. SPIE 1145, 7th Intl Conf on Fourier Transform Spectroscopy, (1 December 1989); https://doi.org/10.1117/12.969608

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KEYWORDS

Polymers

Oxides

Infrared radiation

Chemical species

Macromolecules

Superposition

Atomic, molecular, and optical physics

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