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N. MELNICIUC – PUICĂ1, D. O. DOROHOI2,* , V. MELNIG2
Long periods of exposure to noxious vapors can determine macromolecule splitting through hydrolysis and the emergence of new, hydrophilic functional groups. Thus, sulphur acid induces irreversible breakings down of collagen fibers, by splitting the polypeptide chains to amino acids and ammonium salts. All the above-mentioned phenomena lead to significant changes in the physical and mechanical properties of parchment. Mechanical properties of parchment are altered by sulphur acid, in the presence of oxygen, due to irreversible degradation that collagen fibers suffer, which consists of splitting up polypeptide chains in amino acids and ammonium salts, mainly ammonium sulphate, which renders the material brittle and fragile. Atmospheres rich in sulphur dioxide have a proven noxious influence upon the lastingness of ancient and new parchment. New parchment is less sensitive to the degrading agent than ancient parchment. This paper deals about parchment resistance to chemical degradation. Absorption of water vaporous vs. time exposure for different samples (exposed to 0.01M SO2 during different periods of time) was studied.
Parchment, Collagen, Chemical degradation, Sulphur dioxide.
N. MELNICIUC – PUICĂ, D. O. DOROHOI, V. MELNIG, Evaluation of parchment chemical degradation, Optoelectronics and Advanced Materials - Rapid Communications, 2, 6, June 2008, pp.383-386 (2008).
Submitted at: May 15, 2008
Accepted at: June 5, 2008
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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