Abstract
The influence of the conditions of artificial degradation experiments on the photodegradation process of polyester-urethane clearcoats has been studied by comparing three types of exposure experiments with different conditions regarding the spectral power distribution (SPD), the exposure atmosphere (aerobic and anaerobic) and the presence of water. The presence of short wavelengths (λ <295 nm) in the SPD largely influences the depth-inhomogeneity of degradation with respect to the optical properties and the chemical composition of the coating. The availability of oxygen in the exposure atmosphere determines the degradation pathway that is followed, such as to what extent the photo-oxidative breakage of urethane bonds or the formation of yellow chromophores due to aromatic crosslinking reactions occurs. Indentations at the surfaces of virgin and degraded coatings showed an increase in Young's modulus and hardness when degraded under aerobic conditions, while degradation under anaerobic conditions did not lead to significant changes. The presence of water is responsible for increasing the surface roughness of the coating during degradation, which directly influences the coating's gloss retention. Several time-independent correlations between the changes in chemical, optical and mechanical properties of coatings resulting from different exposure experiments have been established.
| Original language | English |
|---|---|
| Pages (from-to) | 13-25 |
| Number of pages | 13 |
| Journal | Polymer Degradation and Stability |
| Volume | 123 |
| DOIs | |
| Publication status | Published - 1 Jan 2016 |
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Keywords
- FTIR
- Gloss
- Nanoindentation
- Photodegradation
- Polyester-urethane
- UV-VIS
- Water
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The influence of the exposure conditions on the chemical and physical changes of polyester-urethane coatings during photodegradation. / Adema, K.N.S.; Makki, H.; Peters, E.A.J.F.; Lavèn, J.; van der Ven, L. G. J.; Van Benthem, R.A.T.M.; de With, G.
In: Polymer Degradation and Stability, Vol. 123, 01.01.2016, p. 13-25.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - The influence of the exposure conditions on the chemical and physical changes of polyester-urethane coatings during photodegradation
AU - Adema, K.N.S.
AU - Makki, H.
AU - Peters, E.A.J.F.
AU - Lavèn, J.
AU - van der Ven, L. G. J.
AU - Van Benthem, R.A.T.M.
AU - de With, G.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - The influence of the conditions of artificial degradation experiments on the photodegradation process of polyester-urethane clearcoats has been studied by comparing three types of exposure experiments with different conditions regarding the spectral power distribution (SPD), the exposure atmosphere (aerobic and anaerobic) and the presence of water. The presence of short wavelengths (λ <295 nm) in the SPD largely influences the depth-inhomogeneity of degradation with respect to the optical properties and the chemical composition of the coating. The availability of oxygen in the exposure atmosphere determines the degradation pathway that is followed, such as to what extent the photo-oxidative breakage of urethane bonds or the formation of yellow chromophores due to aromatic crosslinking reactions occurs. Indentations at the surfaces of virgin and degraded coatings showed an increase in Young's modulus and hardness when degraded under aerobic conditions, while degradation under anaerobic conditions did not lead to significant changes. The presence of water is responsible for increasing the surface roughness of the coating during degradation, which directly influences the coating's gloss retention. Several time-independent correlations between the changes in chemical, optical and mechanical properties of coatings resulting from different exposure experiments have been established.
AB - The influence of the conditions of artificial degradation experiments on the photodegradation process of polyester-urethane clearcoats has been studied by comparing three types of exposure experiments with different conditions regarding the spectral power distribution (SPD), the exposure atmosphere (aerobic and anaerobic) and the presence of water. The presence of short wavelengths (λ <295 nm) in the SPD largely influences the depth-inhomogeneity of degradation with respect to the optical properties and the chemical composition of the coating. The availability of oxygen in the exposure atmosphere determines the degradation pathway that is followed, such as to what extent the photo-oxidative breakage of urethane bonds or the formation of yellow chromophores due to aromatic crosslinking reactions occurs. Indentations at the surfaces of virgin and degraded coatings showed an increase in Young's modulus and hardness when degraded under aerobic conditions, while degradation under anaerobic conditions did not lead to significant changes. The presence of water is responsible for increasing the surface roughness of the coating during degradation, which directly influences the coating's gloss retention. Several time-independent correlations between the changes in chemical, optical and mechanical properties of coatings resulting from different exposure experiments have been established.
KW - FTIR
KW - Gloss
KW - Nanoindentation
KW - Photodegradation
KW - Polyester-urethane
KW - UV-VIS
KW - Water
UR - http://www.scopus.com/inward/record.url?scp=84947996666&partnerID=8YFLogxK
U2 - 10.1016/j.polymdegradstab.2015.09.026
DO - 10.1016/j.polymdegradstab.2015.09.026
M3 - Article
AN - SCOPUS:84947996666
VL - 123
SP - 13
EP - 25
JO - Polymer Degradation and Stability
JF - Polymer Degradation and Stability
SN - 0141-3910
ER -