Thermal decomposition of wood in oxidizing atmosphere. A kinetic study from non-isothermal TG experiments

Cordero, Tomás; Rodríguez‐Maroto, José Miguel; García, Fernando Herraiz; Rodrı́guez, Juan J.

doi:10.1016/0040-6031(91)87247-t

Cited by 36 publications

(17 citation statements)

References 16 publications

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“…The kinetic parameters, E a and A , at the second stages of CEB10 and CEB12 resulted to be 15.748 kJ/mol and 1.35E+03 min −1 , 20.044 kJ/mol and 3.91E+03 min −1 , respectively. The two activation energies were in good agreement with literature data of lignin decomposition 25, 26. This result confirmed that devolatilization and degradation of pyrolytic lignin in the CEBs occurred in the second mass loss step.…”

Section: Resultssupporting

confidence: 90%

Synthesis, polymerization, and copolymerization of aliphatic vinyl azide

James

Jayakrishnan

2003

J of Applied Polymer Sci

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ABSTRACT:The synthesis and characterization of a fully aliphatic polymeric azide by polymerization of its vinyl monomer 1,3-diazidoisopropyl methacrylate (DAIPM) is reported. DAIPM was prepared by azidation of epichlorohydrin followed by coupling with methacrylic acid. Homopolymer and copolymers with methyl methacrylate were prepared and characterized by IR, GPC, TGA, DTA, and elemental analyses. These polymers are freely soluble in organic solvents like dichloromethane, tetrahydrofuran, dimethyl formamide, acetone, and so forth and do not crosslink on storing. The polymers show decreased thermal stability with an increase in azide content and undergo exothermic decomposition on heating.

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Section: Resultssupporting

confidence: 90%

Synthesis, polymerization, and copolymerization of aliphatic vinyl azide

James

Jayakrishnan

2003

J of Applied Polymer Sci

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“…In many articles, kinetic parameters of the decomposition process of lignocellulosic materials have been estimated, assuming two global reactions with n th‐order rates. For the oxidative decomposition step, the activation energies are roughly comprised between 101 and 136,25 13026, 83–93,34 78 or 12135 (two computation methods), and 52–99 27. For the char oxidation step, the values reported are 35–65,25 110,26 65–83,34100 or 128,35 87–202,27 and 94 kJ/mol 36.…”

Section: Resultsmentioning

confidence: 99%

Two‐step consecutive reaction model and kinetic parameters relevant to the decomposition of Chinese forest fuels

Chen

Liu

Fan

2006

J of Applied Polymer Sci

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Decomposition of some Chinese forest fuels has been studied by means of nonisothermal thermogravimetric analysis in oxidative and inert atmosphere at low heating rates. A comparison between thermogravimetric curves obtained in air and nitrogen shows that the existence of oxygen enhances the decomposition rate and changes the mechanisms of thermal degradation. After the water evaporation, two well-defined decomposition stages have been observed in thermogravimetric curves obtained in air, which correspond to oxidative degradation of main components and oxidation of char formed. A kinetic model named "twostep consecutive reaction model" is developed to describe the thermal degradation process of these materials in air, and there is a good agreement between the experimental and calculated thermogravimetric and derivative thermogravimetric curves.

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“…In general, DTG curves obtained from the thermal degradation of wood in an inert atmosphere do not yield a peak due to the thermal degradation of lignin. In contrast, DTG curves obtained from the thermal degradation of wood in an oxygen environment generally yield a peak due to the thermal degradation of lignin (Chauvette et al, 1985;Cordero et al, 1991;Orfao et al, 1999;Fang et al, 2006;Emandi et al, 2011;Niu et al, 2011).…”

Section: Solubility Of Heartwood Of L Orientalismentioning

confidence: 99%

Ekstraksiyon işlemleri öncesi ve sonrası Liquidambar orientalis mill. odununun termal davranışı

Terzi¹

2017

İstanbul Üniversitesi Orman Fakültesi Dergisi

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The effect of extractives on the thermal behavior of Liquidambar orientalis Mill. (storax) wood is studied using thermogravimetric analysis (TGA). To evaluate the effects of polar and apolar extractives on the thermal behavior of wood, sawdust samples from the heartwood of L. orientalis are extracted with either cold water (48 h), hot water (48 h), or ethanol/toluene (1:2 v/v) (6 h) prior to thermal analysis. Thermogravimetry (TG) curves show that polar and apolar extractives promote char formation, increase the amount of residue, and improve the thermal behavior of L. orientalis wood. In addition, derivative thermogravimetry (DTG) curves demonstrate that thermal degradation of unextracted and cold water-extracted wood samples occurs in a single step, while a two-step degradation pattern is seen for hot water-and ethanol/toluene-extracted wood samples. It is also observed that first degradation reactions in hot water and ethanol/toluene-extracted wood samples occur faster than those in unextracted and cold water-extracted wood samples. Although there are approximately half the number of extracted apolar compounds compared to polar compounds, the removal of both types of compounds affect the thermal properties of L. orientalis wood to the same degree. It is thus deduced that apolar extractives significantly affect the thermal behavior of L. orientalis wood. Keywords: Wood extractives, thermogravimetric analysis, Liquidambar orientalis, storax wood, thermal degradation, natural fire retardants Ekstraksiyon işlemleri öncesi ve sonrası Liquidambar orientalis mill. odununun termal davranışıÖzet: Liquidambar orientalis Mill. odununun termal davranışı üzerine ekstraktif maddelerin etkisi termogravimetrik analiz (TGA) yöntemiyle incelenmiştir. L. orientalis öz odunundan elde edilen öğütülmüş odun unu örnekleri termal analizler öncesinde polar ve apolar ekstraktiflerin odunun termal davranışı üzerine etkisinin araştırılması amacıyla soğuk su (48 s), sıcak su (48 s) ve etanol/toluen (1:2 v/v) (6 s) ekstraksiyonlarına tabi tutulmuştur. Termogravimetri (TG) eğrileri polar ve apolar ekstraktiflerin kömürleşmiş tabaka oluşumunu desteklediğini, kalıntı madde miktarını artırdığını ve L. orientalis odunun termal davranışını iyileştirdiğini göstermiştir. Türevsel termogravimetri (DTG) eğrileri ise ekstraksiyon işlemi uygulanmamış ve soğuk su ile ekstraksiyonuna tabi tutulmuş odun unu örneklerinde termal bozulmanın tek aşamada gerçekleşirken sıcak su ve etanol/toluen ekstraksiyonuna tabi tutulmuş örneklerde termal bozulmanın iki aşamada gerçekleştiği tespit edilmiştir. Ayrıca, sıcak su ve etanol/toluen ekstraksiyonuna tabi tutulmuş örneklerde ilk termal bozulma reaksiyonlarının ekstraksiyon işlemi uygulanmamış ve soğuk su ile ekstraksiyonuna tabi tutulmuş odun unu örneklerine göre daha hızlı olduğu tespit edilmiştir. Ekstrakte edilen apolar bileşiklerin miktarı polar bileşiklerin yaklaşık yarısı kadar olmasına rağmen apolar bileşiklerin ekstraksiyonunun L. orientalis odununun termal özellikleri üzerine polar bileşikler i...

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Thermal decomposition of wood in oxidizing atmosphere. A kinetic study from non-isothermal TG experiments

Cited by 36 publications

References 16 publications

Synthesis, polymerization, and copolymerization of aliphatic vinyl azide

Synthesis, polymerization, and copolymerization of aliphatic vinyl azide

Two‐step consecutive reaction model and kinetic parameters relevant to the decomposition of Chinese forest fuels

Ekstraksiyon işlemleri öncesi ve sonrası Liquidambar orientalis mill. odununun termal davranışı

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