Study of crystalline behavior of heat-treated wood cellulose during treatments in water

Bhuiyan, Tariqur Rabbani; Hirai, Nobuyuki

doi:10.1007/s10086-003-0615-x

Cited by 63 publications

(29 citation statements)

References 6 publications

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“…Thus, heat treatment positively affected the WPC crystallization properties. Previously, it was shown that short-term heat treatment of wood has a positive effect on its crystallinity, while long-term treatment decreases crystallinity (Bhuiyan and Hirai 2005;Phetkaew et al 2008). Here, the results suggested that heat treatment negatively effected the crystallinity degree (Xc).…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Technological and Thermal Properties of Thermoplastic Composites Filled with Heat-treated Alder Wood

et al. 2016

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This study investigated the effect of heat-treated wood content on the water absorption, mechanical, and thermal properties of wood plastic composites (WPCs). The WPCs were produced from various loadings (30, 40, and 50 wt%) of heat-treated and untreated alder wood flours (Alnus glutinosa L.) using high-density polyethylene (HDPE) with 3 wt% maleated polyethylene (MAPE) coupling agent. All WPC formulations were compression molded into a hot press for 3 min at 170 ºC. The WPCs were evaluated using mechanical testing, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The mechanical property values of the WPC specimens decreased with increasing amounts of the heattreated wood flour, except for the tensile modulus values. The heat treatment of alder wood slightly increased the thermal stability of the WPCs compared with the reference WPCs. The crystallization degree (Xc) and the enthalpy of crystallization of the WPCs slightly decreased with increasing content of the heat-treated wood flour. However, all WPCs containing the heat-treated alder wood flour showed a higher crystallinity degree than that of the virgin HDPE.

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Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Technological and Thermal Properties of Thermoplastic Composites Filled with Heat-treated Alder Wood

et al. 2016

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“…Cellulose undergoes limited deformation with heat treatment due to its high molecular weight crystalline structure. Especially, the amorphous structure of cellulose is probably deformed at tempreature above 200°C (Bhuiyan and Hirai 2005). As a result, the slight decrease in cellulose content at temperatures above 200°C (Sundqvist 2004).The amount of components soluble in 1% NaOH increased linearly during heat treatment ( Table 2).…”

Section: Universidad Del Bío -Bíomentioning

confidence: 99%

Changes in the chemical structure and decay resistance of heat-treated narrow-leaved ash wood

Yalçın

Şahin

2015

Maderas, Cienc. tecnol.

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We analyzed the effects of heat treatment on the chemical structure of wood from narrow-leafed Ash (Fraxinus angustifolia), a fast-growing and economically valuable species. We also analyzed the effects of heat treatment on the wood's resistance to four decay fungi. Narrow-leafed Ash wood samples were heated with saturated steam to 140, 180, 200, and 220°C for 2, 4, and 6 h. The relative contents of extractable components were analyzed, as well as the levels of holocellulose, cellulose, and lignin. In addition, the density, equilibrium moisture content, and pH of the samples were measured. To determine the effects of heat treatment on resistance to decay fungi, the samples were exposed to the white rot fungus Trametes versicolor, dry rot fungus Serpula lacrymans, and the brown rot fungi Coniophora puteana and Gloeophyllum trabeum. Changes in the chemical composition of the wood due to heat treatment were correlated with increased resistance to fungal decay. While the hemicellulose content was dramatically reduced with increasing temperature and treatment duration, the lignin content increased proportionately. Thus, heat treatment is an environmentally friendly method of preserving narrow-leafed Ash wood against various decay fungi.

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“…The average width of crystallites obtained from (hkl) diffraction was determined from the following formula (Bhuiyan and Hirai 2005),…”

Section: Determination Of Cellulose Crystallinity By X-ray Diffractiomentioning

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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Study of crystalline behavior of heat-treated wood cellulose during treatments in water

Cited by 63 publications

References 6 publications

Technological and Thermal Properties of Thermoplastic Composites Filled with Heat-treated Alder Wood

Technological and Thermal Properties of Thermoplastic Composites Filled with Heat-treated Alder Wood

Changes in the chemical structure and decay resistance of heat-treated narrow-leaved ash wood

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

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