Matthews, Alice (2010). Thermal characterisation of XB2-CA4 : cyclic poly(butylene terephthalate) with stannoxane catalyst. University of Birmingham. M.Res.
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Matthews10MRes.pdf
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Abstract
The following investigation presents the melting, polymerisation and crystallisation kinetics of XB2-CA4, an oligomer powder of cyclic butylene terephthalate with a stannoxane catalyst, which polymerises into cyclic poly(butylene terephthalate) (cPBT). When heated this material undergoes very rapid concurrent polymerisation and crystallisation. These processes were separated using a combination of two different techniques in the DSC, and Avrami analyses on the data produced. As reported in previous literature it was thought that Stannoxane catalyst degradation above 220°C caused production of linear polymer[1]. However, FTIR and GPC experiments on samples heated to 230°C and 250°C, do not show production of linear polymer, but rather an increased production of cylcic polymer, but of a slightly lower molecular weight than that produced at 170°C and 190°C. It was initially thought that XB2-CA4 did not melt below 170°C, however, GPC experiments showed that some heavier molecules were produced in samples that were held at 150°C for more than 5 minutes. The molecular weight distributions from the GPC showed some significant findings with regard to the potential degradation of the samples above 220°C.
| Type of Work: | Thesis (Masters by Research > M.Res.) |
|---|---|
| Award Type: | Masters by Research > M.Res. |
| Licence: | |
| 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 > TP Chemical technology |
| URI: | http://etheses.bham.ac.uk/id/eprint/1084 |
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