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The crystallisation of Poly (aryl ether etherketone) (PEEK) and its carbon fibre composites

Herrod-Taylor, Andrew James (2011)
M.Res. thesis, University of Birmingham.

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Abstract

Thermoplastic matrix composites are advantageous over thermosetting matrix composites in that they can give improved damage tolerance, shorter production times and inherent recyclability (via melt reprocessing). Poly aryl ether ether ketone (PEEK) is a semi-crystalline, high-performance engineering polymer whose properties can be enhanced through fibre reinforcement. The properties of PEEK and its composites are sensitive to changes in the crystalline content and morphology, which are influenced by the processing conditions. As such it is of great importance to have a good understanding of the crystallisation process of PEEK under various conditions. A number of parameters were investigated with respect to their effects on the crystallisation of neat and carbon fibre reinforced PEEK. The parameters studied were the melt temperature, the isothermal crystallisation temperature, and the non-isothermal cooling rate. It is of paramount importance to heat PEEK in excess of 400°C before processing to remove all previous crystalline entities. PEEK crystallises more rapidly in the presence of carbon fibres as a result of heterogeneous nucleation at the fibre surface. PEEK crystallises in the form of spherulitic crystals under isothermal crystallisation conditions. An increased cooling rate lowers the degree of crystallinity of PEEK as calculated by DSC and verified indirectly by FTIR.

Type of Work:M.Res. thesis.
Supervisor(s):Jenkins, Mike
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Department of Metallurgy and Materials
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:1567
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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