Sorption and diffusion of water in cellulose and cellulose nitrate

Tsilipotkina, M.V.; Tager, A.A.; Kolmakova, L.K.; Perevalova, I.A.; Sopin, V. F.; Марченко, Г. Н.

doi:10.1016/0032-3950(89)90447-4

Cited by 3 publications

(1 citation statement)

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“…A possibility is that film polarity and therefore affinity towards water will increase during degradation leading to higher concentrations of nitric acid resulting from the reaction of nitrogen dioxide with water, Figure and Figure S1. Furthermore, degradation leads to a decrease in the degree of substitution, which induces an increase in the diffusion coefficient and permeability of the film . Water molecules can penetrate more easily into the polymer matrix and the acid formed is entrapped in this polar polymer matrix.…”

Section: Resultsmentioning

confidence: 99%

New insights into the degradation mechanism of cellulose nitrate in cinematographic films by Raman microscopy

Neves

Angelin

Roldão

et al. 2018

J Raman Spectroscopy

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The degradation of cellulose nitrate cinematographic films stored inside an aluminum can was studied by infrared spectroscopy and Raman microscopy. Cellulose nitrate image heritage is strongly susceptible to degradation, being a major conservation challenge. Infrared spectroscopy has been the traditional technique in the assessment of the polymer degradation, but new in situ diagnostic tools to monitor the initial stages of degradation are needed. In this work, cellulose nitrate films were produced and irradiated as aging references to understand how chemical changes were observed in Raman spectroscopy. In comparison with infrared spectroscopy, this technique confirmed the mechanisms proposed in the literature and, at advanced stages of degradation, provided new relevant information detecting an intense peak at 1046 cm −1 associated to nitric acid. Comparing these results with the cinematographic films, it was observed that the plasticizers, which identification was more straightforward using Raman microscopy, have contributions in the regions were chemical changes occur, making it difficult to draw conclusions. Nevertheless, nitric acid and silver nitrate peaks were found in Raman spectra confirming the unstable and noxious environment inside de aluminum can and proving that Raman microscopy can be a valuable complementary in situ technique for cellulose nitrate degradation studies.

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Section: Resultsmentioning

confidence: 99%