Photodegradation behaviour of synthetic paint binders: comparative study of selected acrylic, alkyd, PVAc and nitrocellulose products

Kinga Klemińska; Mirosław Wachowiak

doi:10.14568/cp39265

Autores

Kinga Klemińska Academia Copernicana Interdisciplinary Doctoral School, Nicolaus Copernicus University, Sienkiewicza 30/32, 87-100 Toruń, Poland https://orcid.org/0009-0004-0668-8018
Mirosław Wachowiak Department of Conservation-Restoration of Modern and Contemporary Art, Nicolaus Copernicus University, Sienkiewicza 30/32, 87-100 Toruń, Poland https://orcid.org/0000-0002-6638-8613

DOI:

https://doi.org/10.14568/cp39265

Palavras-chave:

Arte contemporânea, Tintas modernas, Ligantes sintéticos, Envelhecimento com luz, FTIR, Colorimetria

Resumo

As obras de arte modernas e contemporâneas apresentam frequentemente desafios de conservação complexos, devido à utilização generalizada de tintas sintéticas e à diversidade das suas formulações. Este estudo investiga as alterações induzidas pela fotodegradação em produtos comerciais selecionados que representam quatro classes principais de ligantes sintético: acrílico, alquídico, acetato de polivinilo e nitrocelulose, comumente utilizados na pintura do século XX. Amostras de tintas artísticas, dispersões de polímeros, esmaltes alquídicos e vernizes de nitrocelulose foram envelhecidas artificialmente sob radiação UV e examinadas por espectroscopia ATR-FTIR, colorimetria e microscopia digital. Os resultados revelaram padrões de degradação distintos dentro e entre as classes de ligantes, incluindo mudanças de cor e alterações espectrais características ligadas à oxidação e à cisão da cadeia polimérica. As descobertas enfatizam a influência de diversos fatores de formulação da tinta, na estabilidade do material e a necessidade de espectros de referência de materiais envelhecidos para apoiar a identificação em estudos de conservação.

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