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A Raman study of order in some complex polyesters

A Raman study of order in some complex polyesters
A Raman study of order in some complex polyesters
The development of the Fourier Transform Raman spectrometer in the
polymer field has substantially eliminated many of the difficulties previously
encountered when using the conventional technique. Their sensitivity is such that
the Raman spectra of a wide range of polymers, in the as-received form may be
obtained in a few minutes, and with-out prior time consuming optimization of
sample placement in the spectrometer. Furthermore the use of the L064/i line
from a Nd^^:YAG laser as the excitation source has largely eliminated the
fluorescence problem. This thesis describes the application of the technique to
three very different polyester systems.

In Chapter 3 of the thesis the technique has been used successfully to
monitor the autoxidative curing process of a commercially based Alkyd resin and
its model compounds. FT-Raman showed the configurational changes occurring
for the C = C bond {cis/trans isomerism, and conjugation) during autoxidation.
In Chapter 4 a range of novel liquid crystalline polyesters have been
analyzed by FTIR, FT-Raman spectroscopy, Differential scanning calorimetry,
X-ray diffraction, and Thermo-optical analysis. Results have been compared and
contrasted between the techniques, with an emphasis placed on the effects of
lateral substituents and flexible spacer lengths.

Chapter 5 investigates the FT-vibrational spectra of amorphous vs
crystalline polybutylene terephthalate and polybutylene terephthalate blended
with an epoxy resin (synthesised from epichlorohydrin and diphenyl propane)
over a range of cure times and temperatures. Phase separation under certain
conditions has been reported.
University of Southampton
Agbenyega, Jonathan
a583f864-ef50-451c-839d-a4a04e795ff9
Agbenyega, Jonathan
a583f864-ef50-451c-839d-a4a04e795ff9
Hendra, P.J.
c38c1fd1-6a9f-431d-a8ea-ac9961f4acbb

Agbenyega, Jonathan (1992) A Raman study of order in some complex polyesters. University of Southampton, Doctoral Thesis, 223pp.

Record type: Thesis (Doctoral)

Abstract

The development of the Fourier Transform Raman spectrometer in the
polymer field has substantially eliminated many of the difficulties previously
encountered when using the conventional technique. Their sensitivity is such that
the Raman spectra of a wide range of polymers, in the as-received form may be
obtained in a few minutes, and with-out prior time consuming optimization of
sample placement in the spectrometer. Furthermore the use of the L064/i line
from a Nd^^:YAG laser as the excitation source has largely eliminated the
fluorescence problem. This thesis describes the application of the technique to
three very different polyester systems.

In Chapter 3 of the thesis the technique has been used successfully to
monitor the autoxidative curing process of a commercially based Alkyd resin and
its model compounds. FT-Raman showed the configurational changes occurring
for the C = C bond {cis/trans isomerism, and conjugation) during autoxidation.
In Chapter 4 a range of novel liquid crystalline polyesters have been
analyzed by FTIR, FT-Raman spectroscopy, Differential scanning calorimetry,
X-ray diffraction, and Thermo-optical analysis. Results have been compared and
contrasted between the techniques, with an emphasis placed on the effects of
lateral substituents and flexible spacer lengths.

Chapter 5 investigates the FT-vibrational spectra of amorphous vs
crystalline polybutylene terephthalate and polybutylene terephthalate blended
with an epoxy resin (synthesised from epichlorohydrin and diphenyl propane)
over a range of cure times and temperatures. Phase separation under certain
conditions has been reported.

Text
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Published date: 1 October 1992

Identifiers

Local EPrints ID: 421356
URI: https://eprints.soton.ac.uk/id/eprint/421356
PURE UUID: ec6754d4-7c5b-4985-a69e-124797fe1c20

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Date deposited: 05 Jun 2018 16:30
Last modified: 13 Mar 2019 18:25

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