Far infrared and terahertz spectroscopy of polymers / V.A. Ryzhov.

Format:

Book

Author/Creator:

Ryzhov, V. A. (Valery A.), author.

Series:

Polymer science and technology.

Polymer science and technology

Language:

English

Subjects (All):

Polymers--Spectra.

Polymers.

Infrared spectroscopy.

Far infrared lasers.

Physical Description:

1 online resource (186 pages)

Place of Publication:

New York : Nova Science Publishers, [2022]

Summary:

"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 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, and (3) comparing the results with activation barriers for relaxation transitions"-- Provided by publisher.

Contents:

Intro

Contents

Preface

List of Abbreviations

List of Symbols

Introduction

Chapter 1

Features of Infrared Spectra of Polymers

1.1. A Theoretical Approach to the Interpretation of Spectra

1.2. Dispersion Ratios for Polyethylene

1.3. Other Highly Crystalline Polymers

Chapter 2

Skeletal Torsion-Deformation Vibrations in Amorphous Polymers: Theoretical Predictions and Experiment

2.1. Polymethyl Methacrylate (PMMA), Polyvinyl Chloride (PVC), and Polystyrene (PS)

2.2. Correlation Approach to Interpretation of Skeletal Vibrations in the Spectra of Amorphous Polymers

2.3. Connection of Skeletal Torsional Vibrations with Intermolecular Interactions in Amorphous Polymers

Chapter 3

Absorption by the Poly Mechanism in Low-Frequency IR Spectra of Polymers

3.1. Simplest Model for Libration-Driven Absorption

3.2. Librational Absorption in Low-Frequency IR Spectra of Amorphous Polymers in the Range of 20 - 130 cm-1

3.3. Relationship between the Parameters of Librational Absorption and Molecular Characteristics of Polymers

Chapter 4

Low-Frequency IR Spectra and Molecular Interpretation of Relaxation Processes in Amorphous Polymers

4.1. Submillimeter and Millimeter Spectra and Dielectric Relaxation

4.2. Librational Movement and Low Temperature δ - Relaxation

4.3. The Manifestation of the Boson Peak in the Low-Frequency IR Spectra of Amorphous Polymers

4.4. Manifestation of Fast Relaxations in the Terahertz Spectra of Amorphous Polymers

4.5. Skeletal Torsional Vibrations and the General Nature of α and β-Relaxations

4.6. The Onset of Conformational Mobility in Chains and Characteristic Temperatures in Amorphous Polymers

4.7. Gamma-Relaxation

Chapter 5

Low-Frequency IR Spectra as a Source of Direct Information about Interchain Interactions in Polymers

5.1. Hydrogen Bond.

5.2. Ionic Interactions

5.3. Crystallinity, Hot Transitions, Spectra of Biological Macromolecules

5.4. Far Infrared and Terahertz IR Spectra of Liquid Crystal Polymers

Conclusion

References

Appendix

Applications

1. The Relationship between the Molecular Dynamics of Amorphous Polystyrene and Its Modifications and Absorption Parameters of Poley-Type Absorption

Materials and Experimental Techniques

Results and Its Discussion

2. Low-Frequency Librational Oscillations, "Boson Peak" and Interchain Interactions in a Glassy Polymer

Materials and Methods

Results and its Discussion

3. Technique of Far Infrared and Terahertz IR Spectroscopy

Author's Contact Information

Index

Blank Page

Blank Page.

Notes:

Includes bibliographical references and index.

Description based on print version record.

Other Format:

Print version: Ryzhov, Valery A. Far Infrared and Terahertz Spectroscopy of Polymers

ISBN:

9781685078300