Physical properties of poly(ether ether ketone) exposed to simulated severe oilfield service conditions

Musarrat H. Mohammed, William M. Banks, David Hayward, John J. Liggat, Richard A. Pethrick, Barry Thomson

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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.

LanguageEnglish
Pages1264-1270
Number of pages7
JournalPolymer Degradation and Stability
Volume98
Issue number6
DOIs
Publication statusPublished - Jun 2013

Fingerprint

Polyether ether ketones
Carbon Dioxide
ketones
carbon dioxide
ethers
Carbon dioxide
Physical properties
physical properties
Positron annihilation
Methane
matrices
positron annihilation
methane
Gases
dissolved gases
densification
tensile tests
Crystallization
dioxides
Densification

Keywords

  • positron annihilation
  • dynamic mechanical thermal analysis
  • differential scanning calorimery
  • PEEK, poly(ether ether ketone)
  • methane
  • carbon dioxide
  • spectroscopy
  • transport properties
  • crystal morphology
  • polymers
  • degradation
  • blends

Cite this

Mohammed, Musarrat H. ; Banks, William M. ; Hayward, David ; Liggat, John J. ; Pethrick, Richard A. ; Thomson, Barry. / Physical properties of poly(ether ether ketone) exposed to simulated severe oilfield service conditions. In: Polymer Degradation and Stability. 2013 ; Vol. 98, No. 6. pp. 1264-1270.
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abstract = "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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Physical properties of poly(ether ether ketone) exposed to simulated severe oilfield service conditions. / Mohammed, Musarrat H.; Banks, William M.; Hayward, David; Liggat, John J.; Pethrick, Richard A.; Thomson, Barry.

In: Polymer Degradation and Stability, Vol. 98, No. 6, 06.2013, p. 1264-1270.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Physical properties of poly(ether ether ketone) exposed to simulated severe oilfield service conditions

AU - Mohammed, Musarrat H.

AU - Banks, William M.

AU - Hayward, David

AU - Liggat, John J.

AU - Pethrick, Richard A.

AU - Thomson, Barry

N1 - 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

PY - 2013/6

Y1 - 2013/6

N2 - 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.

AB - 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.

KW - positron annihilation

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KW - differential scanning calorimery

KW - PEEK, poly(ether ether ketone)

KW - methane

KW - carbon dioxide

KW - spectroscopy

KW - transport properties

KW - crystal morphology

KW - polymers

KW - degradation

KW - blends

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M3 - Article

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JO - Polymer Degradation and Stability

T2 - Polymer Degradation and Stability

JF - Polymer Degradation and Stability

SN - 0141-3910

IS - 6

ER -