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Sustainable wood coatings made of epoxidized vegetable oils for ultraviolet protection

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Abstract

Environmental policies are becoming more restrictive in preserving ecosystems, encouraging the use of renewable resources such as wood. Wood products need to be protected, notably in outdoor situations, because wood is aging under the effect of climate conditions such as light, water and biodegradation. Surface color modifications occur, accompanied by a decline in physico-mechanical properties. Classical wood coatings are progressively prohibited due to their environmental toxicity, thus calling for safer coatings. Here we review wood photodegradation and protective coatings made of vegetable oils and epoxy resins. Epoxy resins allow high crosslinking and solve the common incompatibility of wood surface and coatings.

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Fig. 1
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Modified after Leary (1968)

Fig. 3

Modified after Cogulet et al. (2018)

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Fig. 5

Reproduced from Cogulet et al. (2016), with permission from Elsevier

Fig. 6

Reproduced from Cogulet et al. (2016), with permission from Elsevier

Fig. 7

Reproduced from Lligadas et al. (2013), available via license Creative Commons Attribution

Fig. 8

Reproduced from Sharmin et al. (2015), with permission from Elsevier

Fig. 9

Reproduced from Rosu et al. (2015b) with permission from Springer

Fig. 10
Fig. 11

Reproduced from Rosu et al. (2016b), with permission from Elsevier

Fig. 12

Modified after Rosu et al. (2016b)

Fig. 13

Reproduced from Fouassier and Lalevée (2014), available via license Creative Commons Attribution

Fig. 14

Modified after Yagci (2010)

Fig. 15

Reproduced from Mahendran et al. (2012), with permission from Elsevier

Fig. 16

Reproduced from Mahendran et al. (2012), with permission from Elsevier

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Abbreviations

UV:

Ultraviolet

IV:

Iodine value

λ :

Wavelength

C. I. E.:

International Commission of Illumination

L*:

Lightness factor

a*:

Chromatic coefficient of red–green

b*:

Chromatic coefficient of yellow–blue

ΔE :

Color modifications

\(\Delta L_{\text{rel}}^{ * }\) :

The relative change in color

ATR-FTIR:

Attenuated total reflectance-Fourier transform infrared spectroscopy

FT-Raman:

Fourier transform-Raman spectroscopy

ESO:

Epoxidized soybean oil

HALS:

Hindered amine light stabilizers

ε :

Extinction coefficient

Фi :

Quantum yield

ФiIabs :

Quantum yield describing the amount of absorbed light

TPO:

Phosphine oxide

HAP:

Hydroxyacetophenone

ELO:

Epoxidized linseed oil

AELO:

Acrylated epoxidized linseed oil

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Acknowledgement

This paper is dedicated to the memory of Acad. Cristofor I. Simionescu (1920–2007) and to the commemorative celebration of the centenary of his birth.

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Correspondence to Liliana Rosu.

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Varganici, CD., Rosu, L., Rosu, D. et al. Sustainable wood coatings made of epoxidized vegetable oils for ultraviolet protection. Environ Chem Lett 19, 307–328 (2021). https://doi.org/10.1007/s10311-020-01067-w

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  • DOI: https://doi.org/10.1007/s10311-020-01067-w

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