Thermal characterisation of XB2-CA4 : cyclic poly(butylene terephthalate) with stannoxane catalyst

Matthews, Alice (2010). Thermal characterisation of XB2-CA4 : cyclic poly(butylene terephthalate) with stannoxane catalyst. University of Birmingham. M.Res.


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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.
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


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