Assessment of heat stability of silicone oil and polyethylene glycol as lubricants of historic leathers

Document Type : Research Article

Authors

Cultural and historic properties department, Art University of Isfahan, Isfahan, Iran

/2015.3.12.4

Abstract

Deterioration of lubricants and dressings used in the conservation of historic recu aesthetic and structural properties of these objects. Therefore, re
e conservation of historic leathers can alter the actural properties of these objects. Therefore, regarding to values of assess ine stability of conservation materials will be required before protective interventions heat stability of polyethylene glycol (PEG) and silicone oil were studied as dry and waterlogged er dressings. Moreover, performance of ascorbic acid (AA) was evaluated as an antioxidanud for PEG. For this purpose, structural stability of leather dressings and aesthetical changes of "e n leathers were investigated by ATR-FTIR spectroscopy and colorimetery technique. The results show that aging process causes to severe oxidation in PEG, whereas ascorbic acid inhibits the change. Color measurement signified an intense color change of the aged PEG and PEG+AA treated leathers. m e , silicone oil had a great heat stability and the treated leathers showed minimum color change. Therefore, silicone oil treatment was characterized best than PEG and PEG+AA, due to its high stability and minimum color change in treated leathers.

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