Physical properties of poly(ether ether ketone) exposed to simulated severe oilfield service conditions
Mohammed, Musarrat H. and Banks, William M. and Hayward, David and Liggat, John J. and Pethrick, Richard A. and Thomson, Barry (2013) Physical properties of poly(ether ether ketone) exposed to simulated severe oilfield service conditions. Polymer Degradation and Stability, 98 (6). pp. 1264-1270. ISSN 0141-3910 (https://doi.org/10.1016/j.polymdegradstab.2013.02....)
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The property changes occurring when poly(ether ether ketone) (PEEK) is subject to methane and carbon dioxide at high pressures (108 Pa) and high temperatures (175-200 °C) are reported. Differential scanning calorimetry, density gradient techniques, positron annihilation lifetime spectroscopy, dynamic mechanical thermal analysis and tensile tests measurements were used to monitor the changes which occur during the ageing process. Over the period of the study an overall increase in the tensile strength was noted, with little or no change in 0.2% and 2% proof stresses, whilst there was a decrease in bending modulus and glass transition temperature due to the effects of plasticization. The Young's modulus generally increases for samples exposed to a temperature of 175 °C in the presence of a mixture of 90% methane and 10% carbon dioxide, or carbon dioxide alone, but it decreases at 200 degrees C in the presence of carbon dioxide alone. The observed effects are consistent with the polymer undergoing initially a densification of the matrix associated with annealing-induced crystallisation, followed by plasticization as the gases permeate into the disordered regions of the matrix. When de-pressurised, the gas dissolved in the matrix attempts to leave the matrix and morphological changes are observed. The complexity of the changes in crystallinity and plasticization in the disordered phase are reflected in changes in the positron annihilation data.
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Item type: Article ID code: 45121 Dates: DateEventJune 2013PublishedNotes: NOTICE: this is the author’s version of a work that was accepted for publication in Polymer Degradation and Stability. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Polymer Degradation and Stability, [VOL 98, ISSUE 6, (1/6/13)] DOI: 10.1016/j.polymdegradstab.2013.02.014 Subjects: Science > Chemistry Department: Faculty of Science > Pure and Applied Chemistry
Faculty of Engineering > Mechanical and Aerospace EngineeringDepositing user: Pure Administrator Date deposited: 11 Oct 2013 13:49 Last modified: 03 May 2024 17:53 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/45121