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The crystallization of Poly(ethylene terephthalate) studied by thermal analysis and FTIR spectroscopy

Chen, Ziyu (2013)
Ph.D. thesis, University of Birmingham.

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Abstract

This thesis concerns the thermal behaviour and properties, isothermal crystallization kinetics and seeded crystallization study of Poly (ethylene terephthalate) (PET) using thermal analysis Fourier transform infrared (TA-FTIR), two-dimensional infrared correlation spectroscopy (2D-FTIR) and differential scanning calorimetry (DSC).

TA-FTIR has been used to characterize phase transitions by a change in the absorbance or peak position with temperature in thermal cycling. It assigns the phase transition temperature to an individual chain segment and observes two different types of thermal behaviours of the functional groups. FTIR finds out that the carbonyl stretching band has an amorphous band and a crystalline band following by analysis of 2D-FTIR.

The isothermal crystallization kinetics of PET was measured from 230 to 240\(^o\)C by FTIR focusing on carbonyl ester group. The deconvolution of these two overlapping absorption bands analyzes the kinetics of both primary and secondary crystallization by Avrami equations.

Melting behaviour study on DSC observes crystallinity, melting temperature and calculated lamellae thickness of PET increase with the extending time period of isothermal crystallization in secondary process.

Seeded crystallization crystallizes polymers at higher temperatures to produce greater lamellae thicknesses and higher melting temperature and to discuss the effect of this morphology on their mechanical and physical properties.

Type of Work:Ph.D. thesis.
Supervisor(s):Hay, James N. and Jenkins, Mike
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Subjects:TA Engineering (General). Civil engineering (General)
TP Chemical technology
Institution:University of Birmingham
ID Code:4251
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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