Molecular analysis and structure and their role in determining the properties of materials
Molecular analysis and structure and their role in determining the properties of materials
The role of molten metal baths in the quench cooling of polyethylene and polypropylene melts has been studied. Polymer fibres were produced from the melt by spinning fibres through a reservoir of molten metal which was held at temperatures near the melting point of the polymer. The materials which were produced exhibited hard elastic behaviour and showed high degrees of elastic recovery when deformed. Wide Angle X-Ray Diffraction and polarised infrared spectroscopy showed significant crystalline orientation was preent within the fibres. It was found that modulus of the fibres produced increased with increasing wind off speed, as did the amount of crystalline orientation. The degree of crystallinity achieved and the lamellar core thickness, as determined by Raman Longitudinal Acoustic Modes, both decreased with increasing wind off speed. The hard elastic recovery which could be achieved was found to be greater for fibres produced through cooler baths. A study was also carried out on several series of nitrated aromatic compounds using the newly developed technique of Fourier Transform Raman Spectroscopy. This has been shown to significantly reduce the problems of fluorescence and alignment which are often encountered when recording spectra on conventional spectrometers using visible lasers. It was found that the frequency of the NO stretching mode in the nitro group is dependent on the electron withdrawing or donating behaviour of substituents which may be present on the aromatic ring.
University of Southampton
1991
Hodges, Colin Mark
(1991)
Molecular analysis and structure and their role in determining the properties of materials.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The role of molten metal baths in the quench cooling of polyethylene and polypropylene melts has been studied. Polymer fibres were produced from the melt by spinning fibres through a reservoir of molten metal which was held at temperatures near the melting point of the polymer. The materials which were produced exhibited hard elastic behaviour and showed high degrees of elastic recovery when deformed. Wide Angle X-Ray Diffraction and polarised infrared spectroscopy showed significant crystalline orientation was preent within the fibres. It was found that modulus of the fibres produced increased with increasing wind off speed, as did the amount of crystalline orientation. The degree of crystallinity achieved and the lamellar core thickness, as determined by Raman Longitudinal Acoustic Modes, both decreased with increasing wind off speed. The hard elastic recovery which could be achieved was found to be greater for fibres produced through cooler baths. A study was also carried out on several series of nitrated aromatic compounds using the newly developed technique of Fourier Transform Raman Spectroscopy. This has been shown to significantly reduce the problems of fluorescence and alignment which are often encountered when recording spectra on conventional spectrometers using visible lasers. It was found that the frequency of the NO stretching mode in the nitro group is dependent on the electron withdrawing or donating behaviour of substituents which may be present on the aromatic ring.
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Published date: 1991
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Local EPrints ID: 461020
URI: http://eprints.soton.ac.uk/id/eprint/461020
PURE UUID: 8ff314fe-5308-45bd-b30a-f278f218da06
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Date deposited: 04 Jul 2022 18:34
Last modified: 04 Jul 2022 18:34
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Author:
Colin Mark Hodges
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