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 language | English |
|---|---|
| Pages (from-to) | 659-671 |
| Number of pages | 13 |
| Journal | Journal of Polymer Science, Part B: Polymer Physics |
| Volume | 54 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 15 Mar 2016 |
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Keywords
- degradation
- internal stress
- mechanical properties
- oxygen permeability
- polyester-urethane
- polyurethanes
- Thermal properties
- thermomechanical properties
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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 journal › Article › Academic › peer-review
TY - JOUR
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.
PY - 2016/3/15
Y1 - 2016/3/15
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.
KW - degradation
KW - internal stress
KW - mechanical properties
KW - oxygen permeability
KW - polyester-urethane
KW - polyurethanes
KW - Thermal properties
KW - thermomechanical properties
UR - http://www.scopus.com/inward/record.url?scp=84957426958&partnerID=8YFLogxK
U2 - 10.1002/polb.23958
DO - 10.1002/polb.23958
M3 - Article
AN - SCOPUS:84957426958
VL - 54
SP - 659
EP - 671
JO - Journal of Polymer Science, Part B: Polymer Physics
JF - Journal of Polymer Science, Part B: Polymer Physics
SN - 0887-6266
IS - 6
ER -