Structural differences between wood species: Evidence from chemical composition, FTIR spectroscopy, and thermogravimetric analysis

Abstract

In this study, the relationship between wood cellulose crystallinity, influence of extractives on wood degradation, correlation between chemical composition, and physical properties of four wood species were investigated by chemical analysis, Fourier transform infrared (FTIR) spectroscopy, and thermogravimetry. The chemical analysis showed that Dipteryx odorata and Mezilaurus itauba (ITA) contained a higher quantity of extractives and lower quantities of holocellulose and lignin than Eucalyptus grandis (EUG) and Pinus elliottii. FTIR spectroscopy indicated that higher extractives content in ITA might be associated with more intense bands at 2920, 2850, and 1510 cm À1 . The lower values for hydrogen bond energy and hydrogen bond intensity showed that EUG contained more absorbed water than the other species. Thermogravimetry confirm that lower extractive contents leads to a better wood thermal stability. This study showed that through the methods used previous information about structure and properties of wood can be obtained before use it in composite formulations. V C 2012Wiley Periodicals, Inc. J Appl Polym Sci 126: E336-E343, 2012

Thermal Degradation and Morphological Aspects of Four Wood Species Used in Lumber Industry

“…The heating rate was 10 °C/min and the mass used in each experiment was around 10 mg. DSC analysis was carried out in a SHIMADZU DSC-50 analyzer in a N 2 atmosphere with 50 cm 3 /min flow, from 0 °C until 550 °C. The heating rate was 10 °C/min and the mass used in each experiment was around 5 mg. Table 1 shows the chemical composition of the fibers used in this study based on a previous work (POLETTO et al, 2012b). PIE and EUG woods present higher quantities of holocellulose than DIP and ITA.…”

“…The mechanical and thermal properties of the lignocellulosic fibers are mainly influenced by their composition, based on cellulose, hemicelluloses and lignin content (ORNAGHI JR et al, 2014;POLETTO et al, 2012b) As an example, higher tensile strength and higher thermal stability are obtained for wood fibers that contain more crystalline cellulose (GÜMÜSKAYA et al, 2003). Hemicelluloses are one of the fiber components responsible to initial thermal degradation behavior and are also associated with the moisture content (ORNAGHI JR et al, 2014).…”

“…So, fibers containing high hemicelluloses content should absorb more moisture and degrade at lower temperature. In addition, higher quantities of extractives may promote fiber degradation at low temperatures (POLETTO et al, 2012b). Thus, the degradation characteristics of lignocellulosic fibers may be estimated based on their chemical composition.…”

Effects of Soaking in Glycerol and Conventional Solvents on the Grinding of Kempas Wood (Koompassia malaccensis)

“…Figure 2(a) shows the ATR-FTIR of untreated and treated kempas wood which displays the appearance of several peaks similar to the basic structure of all wood samples. The peaks observed were the strong broad peak at 3349 cm -1 representing the OH stretching of cellulose, hemicellulose and lignin, C-H stretching at 2902 cm -1 of methyl and methylene group (Poletto et al 2012;Popescu et al 2009) and C=O stretching of carbonyl in carbohydrate (Poletto et al 2012;Popescu et al 2009). There were also several peaks representing the lignin such as peaks at 1597, 1511 and 1235 cm -1 depicting the C=C, C-O stretching or bending vibration and peak at 1455 cm -1 representing the asymmetric bending of CH 3 while methoxy (-OCH 3 ) group presence in the lignin.…”

Optimization of Organic Filler Properties by Its Physical Treatment

“…Natural fibre is a composite in which rigid cellulose micro-fibrils are embedded in a soft matrix composed of lignin and hemicelluloses. These components of fibres influence their physical and mechanical properties [5,6].…”