Conservation Treatment of Newsprint Paper by Polysiloxanes. Study of interpenetrating networks for strengthening and deacidification (CoMPresSil project)
Résumé
Acidity is the main factor in the deterioration of paper, resulting in a loss of material and therefore of the information conveyed. Current methods for the stabilization and mass treatment of paper are based on the neutralization of acids and deposition of a mineral buffer in the fibrous network, called alkaline reserve, which helps the paper fighting future acidity arising during the natural aging process.
The CoMPresSil project aims at developing a new innovative treatment methodology based on the incorporation of aminoalkylalkoxysilane polymers (AAAS) (ex. polyAMDES) and copolymer networks (ex. polyAPTES/polyAMDES) in the paper fibers. The treatment not only provides alkalinity (amine function), but also physical reinforcement of the cellulosic fibers (in-situ polymerization), thereby inducing a significant improvement of the mechanical properties of paper. The methodology mainly targets very degraded documents such as newsprint collections, which are prone to rapid acidification due to their chemical composition.
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