Toft, Michael (2012). The effect of crystalline morphology on the glass transition and enthalpic relaxation in poly (ether-ether-ketone). University of Birmingham. M.Res.
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Toft12MRes.pdf
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Abstract
This work investigates the effect of crystalline morphology on the glass transition and ageing characteristics of semi-crystalline PEEK. It is shown that an increasing degree of crystallinity acts to raise the glass transition temperature of the polymer and reduce the overall degree of enthalpic relaxation. For an equal degree of crystallinity the glass transition temperature is also shown to be sensitive to isothermal crystallisation temperature. By compensating for shifts in Tg and the influence of crystalline content, samples of varying morphology were produced and physically aged at undercoolings tailored to the Tg of the system. A greater degree of enthalpic relaxation was observed in cold crystallised samples where the degree of constraint of the amorphous fraction at the crystal/amorphous interface is thought to be greater.
| Type of Work: | Thesis (Masters by Research > M.Res.) | ||||||
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| Award Type: | Masters by Research > M.Res. | ||||||
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| College/Faculty: | Colleges (2008 onwards) > College of Engineering & Physical Sciences | ||||||
| School or Department: | School of Metallurgy and Materials | ||||||
| Funders: | None/not applicable | ||||||
| Subjects: | T Technology > TN Mining engineering. Metallurgy | ||||||
| URI: | http://etheses.bham.ac.uk/id/eprint/3796 |
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