150 research outputs found
Ageing and Deterioration of Materials in the Environment – Application of Multivariate Data Analysis
In situ polymerisation of isoeugenol as a green consolidation method for waterlogged archaeological wood
Waterlogged archaeological wood is often in need of consolidation prior to drying to prevent shrinkage and cracking of the object. There is a need for new greener materials (than for example polyethylene glycol) and methods for consolidation to be developed. The use of wood-based components could provide good interaction between the consolidant and the remaining wood structure and would also support a shift away from fossil fuel-based materials to those with more sustainable sources. Based on this, lignin-like structures have been investigated for their ability to consolidate waterlogged archaeological wood. The in situ formation of a lignin-like material has been carried out using isoeugenol polymerised by horse radish peroxidase in aqueous solution. The formation of the oligomeric/polymeric materials within the wood following this reaction has been determined by Attenuated Total Reflectance Fourier Transform Infra Red (ATR-FTIR) spectroscopy. The oligomers remaining in solution have been characterised by ATR-FTIR and nuclear magnetic resonance (NMR) spectroscopy as well as analytical ultracentrifugation, showing that they have a weight average Mw of 0.4–0.9 kDa and a lignin-like structure rich in the β-5′ moiety. Therefore, this approach is proposed as a basis to further develop a green consolidation method for waterlogged archaeological wood
Cellulosic films obtained from the treatment of sugarcane bagasse fibers with N -methylmorpholine- N -oxide (NMMO)
Ethanol/water organosolv pulping was used to obtain sugarcane bagasse pulp
that was bleached with sodium chlorite. This bleached pulp was used to obtain cellulosic
films that were further evaluated by Fourier transform infrared (FTIR) spectroscopy,
thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). A good film
formation was observed when temperature of 74 °C and baths of distilled water were used,
which after FTIR, TGA, and SEM analysis indicated no significant difference between the
reaction times. The results showed this to be an interesting and promising process,
combining the prerequisites for a more efficient utilization of agro-industrial residues.Fundação de Amparo à Pesquisa
do Estado de São Paulo (FAPESP), (CNPq), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil; Fundação para a Ciência e a Tecnologia (FCT) and CEMU
How spectroscopy and microspectroscopy of degraded wood contribute to understand fungal wood decay
A review of recent application of near infrared spectroscopy to wood science and technology
Surface properties correlate to the digestibility of hydrothermally pretreated lignocellulosic Poaceae biomass feedstocks
Characterization of Fibers from Pineapple's Crown, Rice Husks and Cotton Textile Residues
Materials produced from plant biomass: part II: evaluation of crystallinity and degradation kinetics of cellulose
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