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

Matthews, Alice (2010)
M.Res. thesis, University of Birmingham.

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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:M.Res. thesis.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Department of Mettalurgy and Materials
Subjects:TP Chemical technology
Institution:University of Birmingham
ID Code:1084
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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