Fourier transform Raman spectroscopy of some polymeric materials
Fourier transform Raman spectroscopy of some polymeric materials
The possible applications of Fourier Transform Raman spectroscopy in the field of polymer science have been investigated. The use of a near infrared excitation source reduces the incidence of sample fluorescence, allowing many polymers and elastomers to be examined directly without any sample preparation for the first time. Natural rubber and polybutadiene rubber samples were mixed with a variety of additives and the FT Raman spectra recorded. It was found that of the common additives studies, only carbon black prevents the acquisition of useful data. Quantitative analyses on the isomeric structure of butadiene rubber and the composition of raw and vulcanized blends are presented. FT Raman spectroscopy has been used to investigate the crystalline, conformational and configurational order in polymers. The FT Raman spectra of atactic and istotactic polystyrene were compared. Bands associated with the configurational order in the samples were identified. By altering the thermal history of the isotactic sample, bands associated with the crystallinity and conformational order were also identified. The FT Raman spectra of natural rubber and deproteinized natural rubber were studied as a function of cold soaking. The spectrum of vulcanized natural rubber was also studied as a function of applied stress. Changes common to these systems were attributed to the formation of monoclinic crystals. Changes which only occurred in the spectrum of the cold soaked natural rubber sample were attributed to a crystalline habit which is nucleated by certain protein impurities. The vulcanization and milling reactions which occur in natural rubber were also studied using FT Raman spectroscopy. The vulcanization process was investigated as a function of time, temperature and curative. Spectra were obtained directly from commercially realistic natural rubber vclucanizates for the first time. The FT Raman spectra of a series of model vulcanization compounds are also presented. They demonstrate that the intensity of C-S and S-S stretching vibrations are dependent upon the unsaturation in the molecules.
University of Southampton
Jones, Catherine Helen
a51f2a65-8144-4252-8246-e1a37f9ad924
1991
Jones, Catherine Helen
a51f2a65-8144-4252-8246-e1a37f9ad924
Jones, Catherine Helen
(1991)
Fourier transform Raman spectroscopy of some polymeric materials.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The possible applications of Fourier Transform Raman spectroscopy in the field of polymer science have been investigated. The use of a near infrared excitation source reduces the incidence of sample fluorescence, allowing many polymers and elastomers to be examined directly without any sample preparation for the first time. Natural rubber and polybutadiene rubber samples were mixed with a variety of additives and the FT Raman spectra recorded. It was found that of the common additives studies, only carbon black prevents the acquisition of useful data. Quantitative analyses on the isomeric structure of butadiene rubber and the composition of raw and vulcanized blends are presented. FT Raman spectroscopy has been used to investigate the crystalline, conformational and configurational order in polymers. The FT Raman spectra of atactic and istotactic polystyrene were compared. Bands associated with the configurational order in the samples were identified. By altering the thermal history of the isotactic sample, bands associated with the crystallinity and conformational order were also identified. The FT Raman spectra of natural rubber and deproteinized natural rubber were studied as a function of cold soaking. The spectrum of vulcanized natural rubber was also studied as a function of applied stress. Changes common to these systems were attributed to the formation of monoclinic crystals. Changes which only occurred in the spectrum of the cold soaked natural rubber sample were attributed to a crystalline habit which is nucleated by certain protein impurities. The vulcanization and milling reactions which occur in natural rubber were also studied using FT Raman spectroscopy. The vulcanization process was investigated as a function of time, temperature and curative. Spectra were obtained directly from commercially realistic natural rubber vclucanizates for the first time. The FT Raman spectra of a series of model vulcanization compounds are also presented. They demonstrate that the intensity of C-S and S-S stretching vibrations are dependent upon the unsaturation in the molecules.
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Published date: 1991
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Local EPrints ID: 461018
URI: http://eprints.soton.ac.uk/id/eprint/461018
PURE UUID: ee4f6713-0693-439b-8641-e99b75045e45
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Date deposited: 04 Jul 2022 18:34
Last modified: 13 Apr 2023 16:49
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Author:
Catherine Helen Jones
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