Journal
PROGRESS IN ORGANIC COATINGS
Volume 99, Issue -, Pages 230-239Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2016.05.015
Keywords
Photocuring; Microcrystalline cellulose; Composites; Mechanical properties; Protective coatings; Wood
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Photocurable composites based on a UV-light curable methacrylic-siloxane resin formulation and various concentrations (5/20 wt%) of microcrystalline cellulose powder (MCC) were prepared and characterized to assess their suitability as protective coatings for wooden artworks. Dynamic mechanical thermal analysis highlighted that MCC promoted an enhancement Of both storage and loss moduli and a decrease of the thermal expansion coefficient. Interestingly, the flexure elastic modulus and the flexure maximum stress of the neat photoresin increased upon the filler addition without any embrittling effect. An increment of hydrophobicity(contact angle), surface hardness (Shore D and pencil scratch tests) of the neat UV-light cured matrix even at the lowest filler loading was observed. These promising results suggest that the photo-curable microcomposites could be able to recover the mechanical and physical properties of damaged wood and replace the traditional resins soluble in toxic solvents utilized in this kind of restoration works. (C) 2016 Elsevier B.V. All rights reserved.
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