Degradation of a polyester-urethane coating: physical properties

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Abstract

In this article we studied the evolution of thermomechanical properties of a polyester-urethane coating during degradation under different degradation conditions, i.e., aerobic and anaerobic conditions with and without dry/wet cycling during degradation. Dynamic mechanical and thermal analyses show that under aerobic conditions the coatings become stiffer and more brittle in the glassy state. This stiffening is probably due to the increase in the amount of hydrogen bonding and the formation of oxidized groups which increase the polarity of the material and enhance the interactions of the polymer segments. However, oxidation reactions result in a considerable decrease in cross-link density and stiffness in the rubbery state. Both changes, in the glassy and rubbery states, give rise to development of internal stresses. These stresses increase as the degradation process proceeds. Nevertheless, for samples exposed to anaerobic conditions, the stiffness remains constant in the glassy state and the cross-link density slightly increases as a result of degradation. This reconfirms the dominance of the effect of oxidation reactions on the mechanical failure of the coatings. Oxygen permeation measurements show a more-or-less time-independent diffusion coefficient and a gradual decrease in solubility of oxygen as a function of exposure time. This results in a slight decrease in oxygen permeation (mainly in the early stage of the degradation) as degradation proceeds.

Original languageEnglish
Pages (from-to)659-671
Number of pages13
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume54
Issue number6
DOIs
Publication statusPublished - 15 Mar 2016

Fingerprint

urethanes
Polyesters
Urethane
polyesters
Physical properties
physical properties
degradation
coatings
Degradation
Coatings
Oxygen
Permeation
stiffness
oxygen
Stiffness
Oxidation
stiffening
oxidation
residual stress
Residual stresses

Keywords

  • degradation
  • internal stress
  • mechanical properties
  • oxygen permeability
  • polyester-urethane
  • polyurethanes
  • Thermal properties
  • thermomechanical properties

Cite this

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title = "Degradation of a polyester-urethane coating: physical properties",
abstract = "In this article we studied the evolution of thermomechanical properties of a polyester-urethane coating during degradation under different degradation conditions, i.e., aerobic and anaerobic conditions with and without dry/wet cycling during degradation. Dynamic mechanical and thermal analyses show that under aerobic conditions the coatings become stiffer and more brittle in the glassy state. This stiffening is probably due to the increase in the amount of hydrogen bonding and the formation of oxidized groups which increase the polarity of the material and enhance the interactions of the polymer segments. However, oxidation reactions result in a considerable decrease in cross-link density and stiffness in the rubbery state. Both changes, in the glassy and rubbery states, give rise to development of internal stresses. These stresses increase as the degradation process proceeds. Nevertheless, for samples exposed to anaerobic conditions, the stiffness remains constant in the glassy state and the cross-link density slightly increases as a result of degradation. This reconfirms the dominance of the effect of oxidation reactions on the mechanical failure of the coatings. Oxygen permeation measurements show a more-or-less time-independent diffusion coefficient and a gradual decrease in solubility of oxygen as a function of exposure time. This results in a slight decrease in oxygen permeation (mainly in the early stage of the degradation) as degradation proceeds.",
keywords = "degradation, internal stress, mechanical properties, oxygen permeability, polyester-urethane, polyurethanes, Thermal properties, thermomechanical properties",
author = "H. Makki and K.N.S. Adema and E.A.J.F. Peters and J. Laven and {van der Ven}, L.G.J. and {Van Benthem}, R.A.T.M. and {de With}, G.",
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Degradation of a polyester-urethane coating : physical properties. / Makki, H.; Adema, K.N.S.; Peters, E.A.J.F.; Laven, J.; van der Ven, L.G.J.; Van Benthem, R.A.T.M.; de With, G.

In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 54, No. 6, 15.03.2016, p. 659-671.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Degradation of a polyester-urethane coating

T2 - physical properties

AU - Makki, H.

AU - Adema, K.N.S.

AU - Peters, E.A.J.F.

AU - Laven, J.

AU - van der Ven, L.G.J.

AU - Van Benthem, R.A.T.M.

AU - de With, G.

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N2 - In this article we studied the evolution of thermomechanical properties of a polyester-urethane coating during degradation under different degradation conditions, i.e., aerobic and anaerobic conditions with and without dry/wet cycling during degradation. Dynamic mechanical and thermal analyses show that under aerobic conditions the coatings become stiffer and more brittle in the glassy state. This stiffening is probably due to the increase in the amount of hydrogen bonding and the formation of oxidized groups which increase the polarity of the material and enhance the interactions of the polymer segments. However, oxidation reactions result in a considerable decrease in cross-link density and stiffness in the rubbery state. Both changes, in the glassy and rubbery states, give rise to development of internal stresses. These stresses increase as the degradation process proceeds. Nevertheless, for samples exposed to anaerobic conditions, the stiffness remains constant in the glassy state and the cross-link density slightly increases as a result of degradation. This reconfirms the dominance of the effect of oxidation reactions on the mechanical failure of the coatings. Oxygen permeation measurements show a more-or-less time-independent diffusion coefficient and a gradual decrease in solubility of oxygen as a function of exposure time. This results in a slight decrease in oxygen permeation (mainly in the early stage of the degradation) as degradation proceeds.

AB - In this article we studied the evolution of thermomechanical properties of a polyester-urethane coating during degradation under different degradation conditions, i.e., aerobic and anaerobic conditions with and without dry/wet cycling during degradation. Dynamic mechanical and thermal analyses show that under aerobic conditions the coatings become stiffer and more brittle in the glassy state. This stiffening is probably due to the increase in the amount of hydrogen bonding and the formation of oxidized groups which increase the polarity of the material and enhance the interactions of the polymer segments. However, oxidation reactions result in a considerable decrease in cross-link density and stiffness in the rubbery state. Both changes, in the glassy and rubbery states, give rise to development of internal stresses. These stresses increase as the degradation process proceeds. Nevertheless, for samples exposed to anaerobic conditions, the stiffness remains constant in the glassy state and the cross-link density slightly increases as a result of degradation. This reconfirms the dominance of the effect of oxidation reactions on the mechanical failure of the coatings. Oxygen permeation measurements show a more-or-less time-independent diffusion coefficient and a gradual decrease in solubility of oxygen as a function of exposure time. This results in a slight decrease in oxygen permeation (mainly in the early stage of the degradation) as degradation proceeds.

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