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Submitted on 12 May 2015
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Conservation Treatment of Newsprint Paper by Polysiloxanes. Study of interpenetrating networks for strengthening and deacidification (CoMPresSil project)
Camille Piovesan, Isabelle Fabre-Francke, Odile Fichet, Anne-Laurence Dupont, Bertrand Lavédrine
To cite this version:
Camille Piovesan, Isabelle Fabre-Francke, Odile Fichet, Anne-Laurence Dupont, Bertrand Lavédrine.
Conservation Treatment of Newsprint Paper by Polysiloxanes. Study of interpenetrating networks for strengthening and deacidification (CoMPresSil project). Cultural heritage conservation science and sustainable development: experience, research, innovation, Oct 2013, Paris, France. 2013. �hal- 01151309�
Introduction
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.
Conservation Treatment of
Newsprint Paper by Polysiloxanes.
Study of interpenetrating networks for strengthening and
deacidification
(CoMPresSil project)
PhD Camille PIOVESAN
Isabelle Fabre-Francke, Odile Fichet (LPPI)
Anne-Laurence Dupont, Bertrand Lavédrine (CRCC)
http://crcc50.sciencesconf.org
AAAS network synthesis
Methods
STEP 2 consolidated STEP 2:
cotton linters (>95%)
Evidence of formation of the silicone networks in the paper
by the determination of the soluble fraction after Soxhlet
solid-liquid extraction with CH2Cl2
≤ 5%: Copolymer network formed
zero-span tensile strength (zsTS) Folding endurance (FE)
Improved mechanical properties (zsTS: intra and inter-fiber strength, FE: plasticity and deformability of fibers)
Alkaline reserve is
proportional to the uptake
Characterization of STEP 2 papers (cotton linters (>95%))
Opacity
Less opacity loss with AAAS
networks than with AMDES
alone
Decrease of hydrophilic character with AAAS networks
Samples Alkaline reserve
(meq (0H-)/100g)
Uptake (wt/wt %)
Immersion
polyAMDES 33 7
polyAPTES 32 7
polyAPTES/polyAMDES 28 6
Spray
polyAPTES/polyAMDES 114 21
Conclusion and future work
• Improved inter and intra-fiber strengthening
• Improved plasticity and deformability
• Deposition of an alkaline reserve
• Study other AAAS networks
• Work with other types of paper : newsprint (highly lignified)
• Evaluate the long-term behavior of treated papers (artificial aging)
Acknowledgements: We thank the PATRIMA Foundation for Camille Piovesan’s doctoral grant (CoMPresSil project)
Réf
AM Imm
AP
Imm AP/AM Imm
AP/AM Spray
Réf
AM Imm
AP Imm
AP/AM Imm
AP/AM Spray
Immersion (solution)
Spray on the paper
Contact angle
SF = wafter − wbefore
wbefore ×100
Incorporation in the cellulose
fibers
polyAPTES / polyAMDES
Water AMDES + APTES
HMDS Cotton
cellulose microfibrils
