A comparison of Fourier Transform and spectrographic processing of Raman scattering
A comparison of Fourier Transform and spectrographic processing of Raman scattering
This thesis describes the advantages and disadvantages of using FT Raman and a conventional Raman microscope to analyse samples under conditions often encountered in industrial environments. Dedicated Raman analysers are then considered and a new design proposed and tested.
Two polymers, isotactic polypropylene and polyethylene(terephthalate) were investigated at temperatures at and above their melting points, Chapter 2. Both FT Raman and a conventional Raman microscope were used to obtain spectra at a variety of temperatures. The influence of black body radiation is discussed. The retention of some short range order in the melt for a few degrees above the melting point is confirmed.
Changes in the crystallinity of drawn and undrawn PET above Tg are evaluated from the Raman spectra. The nature of the crystallinity is commented upon.
The specifications of a cell capable of operating inside the sample area of a standard FT-Raman spectrometer and of holding large volumes of reactants, whilst maintaining them accurately at a constant high temperature are considered in Chapter 3. Two polymerisation reactions, the emulsion polymerisation of vinyl acetate and the homopolymerisation of styrene in benzene, are described. The results are analysed using a variety of methods. The results are compared to literature values to provide an indication of the effectiveness of the novel cell.
The cell is then used with a conventional Raman microscope to study the addition of HBr to vinyl acetate, with the aim of providing semi-continuous monitoring and to elucidate fundamental kinetic data.
Chapter 4 describes the instrumentation used and the wide variety of industrial processes applicable to study by Raman spectroscopy. The development of a novel dedicated process analyser is described in Chapter 5. The concept is described and work done to fulfill and evaluate it. The limitations are commented upon. The process for which it was intended was investigated.
University of Southampton
1998
Brookes, Andrew James
(1998)
A comparison of Fourier Transform and spectrographic processing of Raman scattering.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This thesis describes the advantages and disadvantages of using FT Raman and a conventional Raman microscope to analyse samples under conditions often encountered in industrial environments. Dedicated Raman analysers are then considered and a new design proposed and tested.
Two polymers, isotactic polypropylene and polyethylene(terephthalate) were investigated at temperatures at and above their melting points, Chapter 2. Both FT Raman and a conventional Raman microscope were used to obtain spectra at a variety of temperatures. The influence of black body radiation is discussed. The retention of some short range order in the melt for a few degrees above the melting point is confirmed.
Changes in the crystallinity of drawn and undrawn PET above Tg are evaluated from the Raman spectra. The nature of the crystallinity is commented upon.
The specifications of a cell capable of operating inside the sample area of a standard FT-Raman spectrometer and of holding large volumes of reactants, whilst maintaining them accurately at a constant high temperature are considered in Chapter 3. Two polymerisation reactions, the emulsion polymerisation of vinyl acetate and the homopolymerisation of styrene in benzene, are described. The results are analysed using a variety of methods. The results are compared to literature values to provide an indication of the effectiveness of the novel cell.
The cell is then used with a conventional Raman microscope to study the addition of HBr to vinyl acetate, with the aim of providing semi-continuous monitoring and to elucidate fundamental kinetic data.
Chapter 4 describes the instrumentation used and the wide variety of industrial processes applicable to study by Raman spectroscopy. The development of a novel dedicated process analyser is described in Chapter 5. The concept is described and work done to fulfill and evaluate it. The limitations are commented upon. The process for which it was intended was investigated.
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Published date: 1998
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Local EPrints ID: 463421
URI: http://eprints.soton.ac.uk/id/eprint/463421
PURE UUID: 572bff8c-03cf-4dfa-a774-e35f406242ba
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Date deposited: 04 Jul 2022 20:51
Last modified: 04 Jul 2022 20:51
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Author:
Andrew James Brookes
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