Thermoanalysis of ancient, fresh and waterlogged woods

Abstract

TG, DTG and DSC curves are presented and analytical results, obtained by thermogravimetry and DSC calorimetry, of ancient, fresh and waterlogged wood samples, are discussed. The criteria by which the percent content of iignin, cellulose, water and ashes (residue after heating at 700 ~ were obtained by thermogravimetry, are outlined. Finally DSC curves are reported and the degradation which happen in some wood samples evidenced, especially in the case of waterlogged wood.

Effect of alkali and acid treatment on thermal degradation kinetics of sugar cane bagasse

“…A similar study related the third peak of the sugar cane bagasse to moisture absorption (Munir et al, 2009). Furthermore, they insinuated that the three main constituents of sugarcane bagasse follow different degradation mechanisms, in which hemicellulose degrades in two steps while cellulose and lignin degrades in three stages (Mothé and Miranda, 2013;Campanella et al, 1991). In addition, most of the conducted studies on mechanism of biomass degradation have provided better explanation for the degradation of cellulose probably owing to its higher proportion in most lignocellulosic materials.…”

“…In addition, most of the conducted studies on mechanism of biomass degradation have provided better explanation for the degradation of cellulose probably owing to its higher proportion in most lignocellulosic materials. (Mothé and Miranda, 2013;Campanella et al, 1991;Órfão et al, 1999;Antal, 1995;Cao et al, 2006;Mnzoor et al, 2012). The first degradation stage below 100 • C is attributed to the loss of residual water (Mothé and Miranda, 2013).…”

A comparative thermogravimetric study of waterlogged archaeological and sound woods

“…This study used the TG, DSC, X-ray diffraction, and X-ray fluorescence techniques. TG continuously increases in application to several archaeological woods [8][9][10][11]. Furthermore, we have previously shown that the consolidation of archaeological woods may be monitored by thermogravimetry, which enabled us to evidence quantitatively the impregnants entrapped into the wood and to discriminate the affinity of consolidants differently sized toward the micropores of the cell wall wood [9].…”

Prediction of nutritive value of hay from differential scanning calorimetry measurements on forage and feces

“…Kunihisa and Ogawa (1988) used DSC in their investigations of cellulose crystallization reactions. The DSC technique has been used to examine the biological degradation of wood (Campanella et al 1991), leaf and needle litter (Reh et al 1990), and mushroom compost and wheat straw (Sharma 1990). Most of these studies attributed the measured differences between virgin and partially degraded materials to semi-quantitative changes in the cellulose, hemicellulose and lignin components caused by fungal organisms.…”

“…As observed by Walshaw et al (1998), there was considerable variability between the type of curves produced within forage species. Results of Sharma (1990) and Campanella et al (1991) suggest that the first peak occurring between 300 and 350°C can be attributed to cellulose and hemicellulose degradation. Information from Sharma (1990) suggests that the second peak, at around 425°C, is influenced by residual xylan in close association with lignin, although Walshaw et al (1998) demonstrated that heat fluxes with the protein casein were substantial at temperatures in excess of 420°C.…”