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Water Diffusion and Transport in Oil Paints as Studied by Unilateral NMR and 1 H High-Resolution MAS-NMR Spectroscopy.
ChemPhysChem ( IF 2.3 ) Pub Date : 2019-11-05 , DOI: 10.1002/cphc.201900858 Valeria Di Tullio 1, 2 , Nicholas Zumbulyadis 3, 4 , Silvia A Centeno 1 , Jaclyn Catalano 5 , Molly Wagner 4 , Cecil Dybowski 4
ChemPhysChem ( IF 2.3 ) Pub Date : 2019-11-05 , DOI: 10.1002/cphc.201900858 Valeria Di Tullio 1, 2 , Nicholas Zumbulyadis 3, 4 , Silvia A Centeno 1 , Jaclyn Catalano 5 , Molly Wagner 4 , Cecil Dybowski 4
Affiliation
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Heavy metal carboxylate degradation severely affects thousands of oil paintings. Relative humidity has been reported to accelerate the rate of the reactions. To evaluate its role further, water diffusion and molecular mobility of protons in linseed oil‐based lead white paints were studied by unilateral NMR and 1H HRMAS spectroscopy. The results indicate that exposure to high %RH for relatively long times affects the dynamics of the oil paint's mobile fraction and that the effect is more pronounced as the thickness of the film increases. It was found that the paint can absorb appreciable amounts of water and has a porosity of approximately 6 % available for the diffusion of water, for which a regime of restricted diffusion was observed. Furthermore, the presence of bound and free‐moving water, due to the possible formation of hydrated ionic‐group clusters, supports the hypothesis of a polymeric/ionomeric network, as well as regions of essentially water free to move as in the bulk. The findings allow a better understanding of the role of water as a factor activating the degradation process in linseed oil‐based lead white paints.
中文翻译：
单边NMR和1 H高分辨率MAS-NMR光谱研究了油中水的扩散和迁移。
重金属羧酸盐的降解严重影响了数千幅油画。据报道，相对湿度可以加快反应速度。为了进一步评估其作用，通过单边NMR和1对质子在亚麻籽油基铅白漆中的水扩散和分子迁移率进行了研究。H HRMAS光谱。结果表明，长时间暴露于高％RH会影响油漆流动性部分的动力学，并且随着膜厚度的增加，这种影响会更加明显。已经发现，该涂料可以吸收大量的水并且具有可用于水扩散的约6％的孔隙率，为此观察到了受限的扩散方式。此外，由于可能形成水合的离子基团，束缚和自由移动的水的存在支持了聚合物/离聚物网络的假设，以及基本上无水像散装一样移动的区域的假说。这些发现可以使人们更好地理解水是激活亚麻籽油基铅白漆降解过程的一个因素。
更新日期：2019-11-05
中文翻译：
单边NMR和1 H高分辨率MAS-NMR光谱研究了油中水的扩散和迁移。
重金属羧酸盐的降解严重影响了数千幅油画。据报道，相对湿度可以加快反应速度。为了进一步评估其作用，通过单边NMR和1对质子在亚麻籽油基铅白漆中的水扩散和分子迁移率进行了研究。H HRMAS光谱。结果表明，长时间暴露于高％RH会影响油漆流动性部分的动力学，并且随着膜厚度的增加，这种影响会更加明显。已经发现，该涂料可以吸收大量的水并且具有可用于水扩散的约6％的孔隙率，为此观察到了受限的扩散方式。此外，由于可能形成水合的离子基团，束缚和自由移动的水的存在支持了聚合物/离聚物网络的假设，以及基本上无水像散装一样移动的区域的假说。这些发现可以使人们更好地理解水是激活亚麻籽油基铅白漆降解过程的一个因素。
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