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Preservation treatments of aged papers by supercritical carbon dioxide
Author(s) -
Selli Elena,
Langè Elena,
Mossa Andrea,
Testa Giovanni,
Seves Alberto
Publication year - 2000
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/1439-2054(20000801)280:1<71::aid-mame71>3.0.co;2-t
Subject(s) - supercritical carbon dioxide , solvent , supercritical fluid , carbon dioxide , catechol , ethanol , materials science , chemical engineering , ultimate tensile strength , nuclear chemistry , organic chemistry , pulp and paper industry , chemistry , composite material , engineering
Innovative neutralizing and strengthening treatments for aged acidic paper have been developed, based on the use of supercritical carbon dioxide (CO 2 SCF) as solvent system. After treatment with the non toxic neutralizing agent CaCO 3 in CO 2 SCF, acidic papers exhibited a pH increase of water extracts, the creation of an alkaline reserve and a decrease in the rate of artificial aging, while mechanical tensile properties of aged acidic papers improved after treatment with catechol both simply dissolved in ethanol or in CO 2 SCF in the presence of ethanol as co‐solvent.