Far Infrared and Terahertz Spectroscopy of Polymers

186 Pages·2022·17.209 MB·English

by  Valery A. Ryzhov

Polymer Science and Technology

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V. A. Ryzhov

Far Infrared and Terahertz
Spectroscopy of Polymers
Copyright © 2022 by Nova Science Publishers, Inc.
DOI: https://doi.org/10.52305/YKKP7083

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ISBN: (cid:28)(cid:26)(cid:27)(cid:16)(cid:20)(cid:16)(cid:25)(cid:27)(cid:24)(cid:19)(cid:26)(cid:16)(cid:27)(cid:22)(cid:19)(cid:16)(cid:19)(cid:3)(cid:11)(cid:72)(cid:37)(cid:82)(cid:82)(cid:78)(cid:12)

Published by Nova Science Publishers, Inc. † New York
Contents

Preface .......................................................................................... vii
List of Abbreviations .................................................................................. ix
Introduction ......................................................................................... xiii
Chapter 1 Features of Infrared Spectra of Polymers ............................1
Chapter 2 Skeletal Torsion-Deformation Vibrations
in Amorphous Polymers: Theoretical Predictions
and Experiment ..................................................................11
Chapter 3 Absorption by the Poly Mechanism
in Low-Frequency IR Spectra of Polymers .......................21
Chapter 4 Low-Frequency IR Spectra and Molecular Interpretation
of Relaxation Processes in Amorphous Polymers .............37
Chapter 5 Low-Frequency IR Spectra as a Source of Direct
Information about Interchain Interactions
in Polymers ........................................................................83
Conclusion ......................................................................................... 117
References ......................................................................................... 119
Appendix ......................................................................................... 129
Author's Contact Information ................................................................ 163
Index ......................................................................................... 165

Preface

The presented work summarizes and systematizes an extensive experimental
material of the results of studying polymers using spectroscopy in the low-
frequency infrared region.
Today, spectroscopic studies in the far infrared region are becoming an
important tool for characterizing the physical properties of polymers,
determined by molecular dynamics and the level of molecular interactions.
Low-frequency spectroscopy of intermolecular interactions is the original
and most informative source and criterion for establishing the presence of a
hydrogen bond in biological substances, multiplets and clusters in ionomers,
a criterion for crystallinity, etc.
Far IR spectroscopy has proven to be productive in deciphering the
molecular nature of solid-state (δ, β, and γ) relaxation transitions in
polymers. This was the result of (1) evaluating the potential barriers and
sizes of molecular motion units from the spectra, (2) finding empirical
correlations between the spectral parameters and molecular characteristics of
polymers, (3) comparing the results with activation barriers for relaxation
transitions.