Thermal decomposition of native cellulose: Influence on crystallite size

Kim, Ung-Jin; Eom, Seok Hyun; Wada, Masahisa

doi:10.1016/j.polymdegradstab.2010.02.009

Cited by 306 publications

(165 citation statements)

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“…This behavior may be associated with the highest crystalline cellulose index in this wood. In a recent study, Kim et al (2010) showed that the thermal decomposition of cellulose shifted to higher temperatures with increasing crystallinity cellulose index.…”

Section: Wood Thermal Propertiesmentioning

confidence: 99%

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

Poletto

2016

Rev. Árvore

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-The aim of this work was characterize four wood waste samples from lumber industry in order to obtain previous information about structure and properties of wood before use it as a biofuel or as reinforcement in composite formulations. The influence of wood components on the thermal degradation stability of different wood species has been investigated using thermogravimetry, differential scanning calorimetry and scanning electron microscopy. Four wood species, Eucalyptus grandis (EUG), Pinus elliottii (PIE), Dipteryx odorata (DIP) and Mezilaurus itauba (ITA), were used in this study. The results showed that higher extractives contents may form a thin film on the wood fiber surface which can accelerate the degradation process and reduce the wood thermal stability Keywords: Wood thermal stability; Wood chemical composition; Wood waste. DEGRADAÇÃO TÉRMICA E ASPECTOS MORFOLÓGICOS DE QUATRO ESPÉCIES DE MADEIRA PROVENIENTES DA INDÚSTRIA MADEIREIRARESUMO -O objetivo deste trabalho foi caracterizar quatro amostras de resíduos de madeira oriundas da indústria madeireira a fim de obter informações prévias sobre a estrutura e as propriedades da madeira antes do seu uso como biocombustível ou como reforço em compósitos. A influência dos componentes da madeira na estabilidade térmica de diferentes espécies de madeira foi investigada utilizando termogravimetria, calorimetria exploratória diferencial e microscopia eletrônica de varredura. Quatro espécies de madeira, Eucalyptus grandis (EUG), Pinus elliottii (PIE), Dipteryx odorata (DIP) e Mezilaurus itauba (ITA), foram utilizadas neste estudo. Os resultados mostraram que elevadas quantidades de extrativos podem formar uma fina película na superfície da fibra de madeira, o que pode acelerar o processo de degradação e reduzir a estabilidade térmica da madeira.Palavras-chave: Estabilidade térmica da madeira; Composição química da madeira; Resíduos de madeira.

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Section: Wood Thermal Propertiesmentioning

confidence: 99%

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

Poletto

2016

Rev. Árvore

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“…) and water and formaldehyde were formed and released. The cellulose fibers mainly degraded between 250 °C and 400 °C, where the cellulose decomposed through the formation of levoglucosan (Kim et al 2010;Hu et al 2012). Further, some weight loss occurred at temperatures lower than 100 °C, which potentially corresponded to moisture losses in the WF.…”

Section: Tg Analysismentioning

confidence: 99%

Investigation into Mechanical, Thermal, Flame-Retardant Properties of Wood Fiber Reinforced Ultra-High-Density Fiberboards

2017

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The demand has grown in many fields for materials that are eco-friendly and sustainably developed. In this study, several formulations of novel wood fiber reinforced ultra-high-density fiberboards (UHDFs) using resoltype phenolic resin (RTPR) as binders were manufactured for application in decorative building facades. The influences of the various formulations on water resistance and the mechanical, thermal, and fire-resistant properties were systematically examined. All formulations of the UHDFs exhibited better water resistance, internal bonding, and fire resistance as the RTPR content and density increased. To better evaluate mechanical properties, the microstructure of the UHDFs was observed using scanning electron microscopy. After optimization of hot-pressing conditions, UHDFs with excellent mechanical properties of approximately 7.2 GPa, 85.9 MPa, and 5.4 MPa for bending modulus, bending strength, and internal bonding, respectively, were achieved. Good water and flame resistance were also achieved, which makes these materials competitive with other commercial products. District, Beijing, PR China, 100091; b: College of Furniture and Industrial Design, Nanjing Forestry University, No. 159 LongPan Road, Nanjing, Jiangsu, P.R. China, 210037; * Corresponding author: Guowj717@sina.com Keywords INTRODUCTIONCurrently, reducing carbon and promoting sustainable development are among the most pressing issues in high-energy-dissipation building projects, which are now making great efforts to develop green building materials. Ceramic tiles are an important material for use in decorative building facades. However, their production process creates a lot of dust and consumes a lot of electrical energy. Therefore, the authors proposed a novel, natural, fiber-reinforced biomass composite as an alternative to ceramic tiles for use in decorative facades, contributing to the sustainable development of green buildings.Wood fibers, an environmentally friendly, natural fiber, have been widely used in indoor furniture (Saz-Orozco et al. 2014;Sommerhuber et al. 2016;Wang et al. 2016) and automobile interiors (Ann Gnpta et al. 2008;Gallo et al. 2013), but are not often used as structural materials in engineering due to their poor mechanical properties.Conventionally, wood fiber reinforced composites are composed of wood fibers that have been pressed together under high temperature and pressure with a resin binder to form a homogeneous board. Studies on wood fiber reinforced composites have mainly focused on low-density fiberboard (LDF) (< 600 kg/m 3 ) (Chen et al. 2015a,b;Cai et al. 2016) and medium-density fiberboard (MDF) (600 kg/m 3 to 800 kg/m 3 ) (Sliseris et al. (2015) and Arévalo and Peijs (2016) prepared MDF using methylene diphenyl diisocyanate and the self-binding capability of cellulose, respectively. However, these improvements are very limited and cannot be used in decorative facades due to its low mechanical properties according to JG/T 260 (2009). To promote the application of wood fiber reinforced composite...

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“…A low-order transitional structure was formed in the pretreated samples, which could be dependent on the pretreatment conditions such as temperature and addition of water . Third, the thermal stability of cellulose was found to depend mainly on its crystallinity index, crystallite size, and degree of polymerization (Kim et al 2010;Poletto et al 2011). The degree of polymerization is usually associated with the result of cellulose molecular weight and the amount of glucose units in the cellulose molecular chain.…”

Section: Characterization Of Pretreated Cellulosementioning

confidence: 99%

Characterization of Bamboo after Ionic Liquid-H2O Pretreatment for the Pyrolysis Process

Chen¹,

Endo²,

Wang³

2015

BioResources

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Bamboo (Phyllostachys edulis) samples pretreated with ionic liquid (ILs)-H2O mixtures were studied concerning their application in the pyrolysis process.[Bmim]Cl-H2O, [Bmim]BF4-H2O, [Bmim]HSO4-H2O, and [Bmim]Ac-H2O mixture systems were used in the pretreatment process. The characteristics of pretreated bamboo were analyzed, as was cellulose extracted from ILs-H2O pretreated bamboo. The enrichment of cellulose (α-cellulose) in pretreated bamboo was achieved. The amount of char resulting from the pyrolysis of the [Bmim]Ac-H2O pretreated sample (20.1 wt%) was lower than the untreated bamboo sample (24.2 wt%) at 900 °C. A greater proportion of the pretreated bamboo samples was converted into gas products and/or liquids. The pretreated cellulose pyrolysis process could proceed more easily than processing untreated samples due to the disordered crystalline cellulose structure and the decrease in molecular weight.

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Thermal decomposition of native cellulose: Influence on crystallite size

Cited by 306 publications

References 19 publications

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

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

Investigation into Mechanical, Thermal, Flame-Retardant Properties of Wood Fiber Reinforced Ultra-High-Density Fiberboards

Characterization of Bamboo after Ionic Liquid-H2O Pretreatment for the Pyrolysis Process

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