The structure of polymer melts and solids
The structure of polymer melts and solids
The thesis begins with a description of various models proposed to describe the structure of polymer melts end solids. This is followed by an experimental section with particular reference to Laser Ramen spectroscopy and the use of the 'longitudinal acoustic mode' in characterising lamellar thicknesses in polymers. Chapter III describes some experiments carried out by the author on polymers which were rapidly quenched from the melt. The Findings show that theories based on polymer single crystals are inappropriate under these crystallisation conditions. This feature is of some industrial importance as the large scale manufacture of polymers likewise involves rapid cooling from the molten state. Experimental data obtained on irradiated polyethylene is presented and suggests that chain entanglements influence the crystallisation behaviour of polymers. The final chapter extends the range of rapid cooling experiments in order to investigate quenching from below the melting point. The behaviour thus observed suggests an analogy with that of rubber and a possible explanation for the variation of lamellar thickness with temperature as described throughout this report.
University of Southampton
Scerri, Eric Robert
cb1ef133-241c-45c5-ade3-73884e64ef69
March 1979
Scerri, Eric Robert
cb1ef133-241c-45c5-ade3-73884e64ef69
Hendra, P.J.
c38c1fd1-6a9f-431d-a8ea-ac9961f4acbb
Scerri, Eric Robert
(1979)
The structure of polymer melts and solids.
University of Southampton, Doctoral Thesis, 97pp.
Record type:
Thesis
(Doctoral)
Abstract
The thesis begins with a description of various models proposed to describe the structure of polymer melts end solids. This is followed by an experimental section with particular reference to Laser Ramen spectroscopy and the use of the 'longitudinal acoustic mode' in characterising lamellar thicknesses in polymers. Chapter III describes some experiments carried out by the author on polymers which were rapidly quenched from the melt. The Findings show that theories based on polymer single crystals are inappropriate under these crystallisation conditions. This feature is of some industrial importance as the large scale manufacture of polymers likewise involves rapid cooling from the molten state. Experimental data obtained on irradiated polyethylene is presented and suggests that chain entanglements influence the crystallisation behaviour of polymers. The final chapter extends the range of rapid cooling experiments in order to investigate quenching from below the melting point. The behaviour thus observed suggests an analogy with that of rubber and a possible explanation for the variation of lamellar thickness with temperature as described throughout this report.
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80027438
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Published date: March 1979
Identifiers
Local EPrints ID: 476975
URI: http://eprints.soton.ac.uk/id/eprint/476975
PURE UUID: 2759ac1a-5db3-4af6-a325-b1360886c5eb
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Date deposited: 22 May 2023 17:14
Last modified: 17 Mar 2024 02:23
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Contributors
Author:
Eric Robert Scerri
Thesis advisor:
P.J. Hendra
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