The effects of various pulping conditions on crystalline structure of cellulose in cotton linters

Gümüşkaya, Esat; Usta, Mustafa; Kırcı, Hüseyin

doi:10.1016/s0141-3910(03)00157-5

Cited by 195 publications

(117 citation statements)

References 12 publications

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“…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).…”

Section: Wood Chemical Compositionmentioning

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 Chemical Compositionmentioning

confidence: 99%

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

Poletto

2016

Rev. Árvore

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“…The water retention value (WRV) is an important property closely associated with cellulose crystallinity and swelling capability (Forsström et al 2005;Gumuskaya et al 2003). The WRV value was determined by the centrifugal method (Wistara and Yong 1999) on pulp or paper with a dry weight equivalent of 1.5 g. Centrifugation was stopped after 15 min at 3000 rpm.…”

Section: Determination Of Wrvmentioning

confidence: 99%

Effects of Different Deinking Processes on Fiber Morphology, Hydrogen Bond Models, and Cellulose Supramolecular Structure

Meng

Wan

et al. 2013

BioResources

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Deinked pulp fibers produced by three kinds of deinking processes, alkaline deinking, neutral deinking, and enzymatic deinking, were studied by Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectrometer (FTIR), X-ray Diffraction (XRD), and CrossPolarization Magic Angle Spinning Carbon-13 Nuclear Magnetic Resonance (CP/MAS 13 C-NMR). There were remarkable differences in both macroscopic and microscopic structure between the samples. SEM images showed that the effects of deinking processes on fiber morphology were obvious and the influences of alkaline deinking were the most apparent. FTIR analysis indicated that the content of intermolecular hydrogen bonds increased by 22.63%, 9.42%, and 14.40% after the alkaline deinking process, neutral deinking process, and enzymatic deinking process, respectively. XRD revealed that the average width of crystallite size in the (002) lattice plane was decreased after different deinking processes, in accordance with the change tendency of cellulose crystallinity. CP/MAS 13 C NMR combined with spectral fitting demonstrated that the content of different cellulose polymorphs changed during deinking processes. The increase of WRV was attributed to changes in the hydrogen bonding patterns and cellulose supramolecular structure. Technology, Guangzhou 510640, PR China; c: School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, PR China; *Corresponding author:mwizard@126.com Keywords INTRODUCTIONWith the demand of protecting forest resources and developing a low-carbon economy, secondary fiber recycling has aroused the attention of technologists throughout the world, and the rapid growth of the waste paper utilization has become an important trend of the world's paper industry. According to the statistics of the China Paper Association, the total consumption of pulp from wastepaper in the paper industry was 44.39 million tons in 2008 in China. In 2011 it increased to 56.60 million tons, accounting for 62% of total pulp consumption (China Paper Association). Recycled cellulose fiber accounted for about 70% of the papermaking materials by the end of the 20 th century (Wan and Ma 2004). This recycled material can help make up for an insufficient supply of fresh papermaking raw materials, can reduce energy consumption in comparison to the pulping of wood, and also can play an essential role in decreasing environmental pollution problems. Deinking is an important stage in secondary fiber PEER-REVIEWED ARTICLE bioresources.com Meng et al. (2013). "Hydrogen bonds & deinking," BioResources 8(2), 2398-2416. 2399recycling. Conventional deinking processes often employ sodium hydroxide in combination with a large amount of other chemicals, including sodium silicate, hydrogen peroxide, and surfactants (Shrinath et al. 1991). This high pH and chemical-intensive process leads to several major problems for the process and recycled paper quality, including a high degree of fragmentation of large sticky contaminants, darkening of pu...

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“…The increase in cooking temperature during pulping process can promote more chain scission reactions increasing the amorphous character of the cellulose, which reduce the total amount of cellulose crystalline regions 9,23 . Cellulose crystallinity is one of the most important crystalline structure parameters in cellulose fibers 10 . The thermal stability of cellulose was found to depend mainly on its crystallinity 11,12 .…”

Section: Introductionmentioning

confidence: 99%

“…Thus, cellulose crystallinity and hydrogen bond between cellulose chains play an important role in the mechanical and thermal properties of composite materials reinforced with cellulose fibers 1,13 . Several techniques as X-ray diffraction and FTIR spectroscopy were used to evaluate the wood and cellulose crystallinity 5,7,8,9,10,12 . However, FTIR spectroscopy has been used as a simple technique for obtaining rapid information about the structure of cellulose and chemical changes taking place in cellulose due to various treatments 10,21,22,[25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

Materials produced from plant biomass: part II: evaluation of crystallinity and degradation kinetics of cellulose

et al. 2012

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In this study Eucalyptus grandis (CEG) and Pinus taeda (CPT) cellulose fibers obtained from kraft and sulfite pulping process, respectively, were characterized using Fourier transform infrared (FTIR) spectroscopy and thermogravimetry (TGA). The degradation kinetic parameters were determined by TGA using Coats and Redfern method. FTIR results showed that CPT presented a more ordered structure with higher crystallinity than CEG. Thermogravimetric results showed that CPT had a higher thermal stability than CEG. The kinetic results revel that for CEG the degradation mechanism occurs mainly by random nucleation, although phase boundary controlled reactions also occurs while for CPT the degradation process is more related with phase boundary controlled reactions. Results demonstrated that differences between thermal stability and degradation mechanisms might be associated with differences in the cellulose crystalline structure probably caused by different pulping processes used for obtaining the cellulose fibers.

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The effects of various pulping conditions on crystalline structure of cellulose in cotton linters

Cited by 195 publications

References 12 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

Effects of Different Deinking Processes on Fiber Morphology, Hydrogen Bond Models, and Cellulose Supramolecular Structure

Materials produced from plant biomass: part II: evaluation of crystallinity and degradation kinetics of cellulose

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