A comparison between micro- and nanocellulose-filled composite adhesives for oil paintings restoration. Issue 4 (2nd October 2015)

• Record Type: Journal Article
• Authors: Cataldi, Annalisa; Berglund, Lars; Deflorian, Flavio; Pegoretti, Alessandro
• Is Part Of: Nanocomposites. Volume 1:Issue 4(2015)
• Page Start: 195
• Page End: 203
• Publication Date: 2015-10-02
• Subjects: Cellulose -- Nanocomposites -- Mechanical properties -- Adhesion -- Cultural heritage; Nanocomposites (Materials) -- Periodicals; 620.11805
• DOI: Http://www.tandfonline.com/doi/10.1080/20550324.2015.1117239
• Languages: English
• ISSNs: 2055-0324

Abstract

Abstract: Cellulose nanocrystals (CNC) and microcrystals (CMC) were selected as reinforcing fillers for poly(2-ethyl-2-oxazoline), a water-soluble thermoplastic adhesive widely used in the restoration of oil paintings. Thin composite films containing 5, 10, and 30 wt% of CNC or CMC were produced by solution mixing and casting. UV-vis spectroscopy showed how CNC preserved the adhesive transparency even at the highest CNC content, while for CMC, a progressive loss of transparency was observed. Thermal analysis evidenced a progressive increase of the glass transition temperature of the polymer matrix induced by CNC, while no effects were observed for CMC. Both micro- and nanocellulose were able to improve the elastic modulus and reduce the thermal expansion coefficient and creep compliance of the adhesive, with effects more pronounced for CNC nanoparticles. Finally, single-lap shear test on bonded ancient oil painting substrates confirmed the improved dimensional stability of the joint imparted by CNC in the adhesive under both quasi-static and creep conditions. Abstract :