Kinetic analysis of color changes in cellulose during heat treatment

Matsuo, Motoaki; Umemura, Kenji; Kawai, Shinya

doi:10.1007/s10086-011-1235-5

Cited by 42 publications

(28 citation statements)

References 31 publications

(39 reference statements)

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“…It was reported that the changes in L * and DE * of hinoki had similar degree to those of cellulose during heat treatment at 180°C. Carbonyl groups in the cellulose chains and the formation of low molecular substances (furan type) were estimated as being responsible for the colour changes [21]. Moreover, total changes of colour in thermally modified wood originates from chemical changes more in lignin than in polysaccharides, due to the darkening of lignin itself, which is associated with the generation of chromophoric groups [18].…”

Section: Resultsmentioning

confidence: 99%

“…Previous studies performed on solid wood have investigated the changes in wood colour that appeared during heat treatment and imply alteration of wood components [17][18][19]. The colour that wood gets after heat treatment was suggested to be an indicator of the degree of its modification and also a direct indication of chemical changes [20,21]. Little information addressed the veneers modification of various wood species by heat treatment.…”

Section: Introductionmentioning

confidence: 99%

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Effect of heat treatment on colour changes of black alder and beech veneers

et al. 2016

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In the present study, colour changes in black alder (Alnus glutinosa L. Gaertn.) and beech (Fagus sylvatica L.) wood veneers subjected to heat treatment at 190°C for different time spans were investigated. The potential of CIELab system and near infrared (NIR) spectroscopy were used to evaluate the colour changes. The changes in colour appeared mostly by the reduction in lightness which is related to the degradation of hemicelluloses during heat treatment in both wood species. It was found that black alder discoloured much more than beech veneers under same treatment conditions. NIR spectra revealed that the dark colour that wood veneers get under heat exposure is due to the chemical decomposition of lignin and hemicelluloses. Heat treatment could, therefore, enhance the use of such veneers for value added products in furniture manufacturing as an alternative to expensive tropical species.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on colour changes of black alder and beech veneers

et al. 2016

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“…The TTSP was originally used to analyze material viscoelasticity [25], and it is widely used to analyze the mechanical properties of wood [26], such as wood creep performance [27][28][29]. The TTSP was also used in thermal degradation analysis combined with the Arrhenius equation, and it has been used for the determination of the color change of cellulose [30] and wood-plastic composite discoloration analysis [31]. In recent years, model-building methods have also been used in the field of wood thermal discoloration for further examination and experimentation.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Analysis of the Color of Larch Sapwood and Heartwood during Heat Treatment

Wei

Zhang

Liu

et al. 2018

Forests

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Abstract:The kinetics of color changes in larch sapwood and heartwood during heat treatment were investigated in this study in order to determine if the process of color change that occurs in the surface of wood can be regulated. Wood samples were heated at 90, 110, 130, and 150 • C in an oven, vacuum, and in an oven subjected to saturated steam for 3, 6, 9, and 12 h each. The results of the color measurement showed that the values of L* (lightness) and ∆E* (total color difference) decreased and increased in both the sapwood and heartwood, respectively, with increasing temperature and treatment time. The three kinetic model approach, consisting of (i) the time-temperature superposition principle (TTSP); (ii) zero-order reaction model; and, (iii) first-order reaction model, was used to model the kinetics of color changes. The results indicated that the L* value of the sample (including heartwood and sapwood) was well fitted to the first-order reaction model (R 2 = 0.9999). The Arrhenius activation energy was 14.2369 and 11.0984 kJ/mol for the sapwood and heartwood, respectively. The first-order reaction model also showed a better fit for the ∆E* values between sapwood and heartwood with higher R 2 values than the other two methods. Therefore, the color changes of larch wood could successfully be analyzed using the first-order reaction model.

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“…As the second parameter, the pre-dry temperature was tested by 30, 60 and 90 °C with the chosen spinning speed of 1700 cm/min. Above 100 °C, the CNFs in the suspension began denaturation with color change thus the temperature was changed below 100 °C [28]. In this experiment, the case of 30 °C reveals the highest mechanical properties.…”

Section: Resultsmentioning

confidence: 76%

Effect of Wet Spinning and Stretching to Enhance Mechanical Properties of Cellulose Nanofiber Filament

Kim

Lee

et al. 2019

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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Long filament made with nanocellulose has been researched due to its eminent mechanical and physical properties for next generation of natural fiber reinforced polymer composites. Wet spinning process for long filament fabrication in conjunction with stretching method has advantages of high efficiency and low-cost. To fabricate homogeneous and strong cellulose nanofiber filament, this paper experimentally investigates the process parameters, including spinning speed, pre-dry temperature and inner diameter of needle. In addition to the spinning process, a mechanical stretching process is taken into account to further improve the mechanical properties of the cellulose nanofiber filament. The effects of wet spinning and stretching are evaluated by using scanning electron microscope, tensile test and 2D wide angle X-ray diffraction. As a result, the stretched cellulose nanofiber filament exhibits its Young's modulus of 37.5 GPa and tensile strength of 543.1 MPa, which are significantly improved from the previous reports. All about the fabrication process, characterization and evaluation of the cellulose nanofiber filaments are illustrated.

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Kinetic analysis of color changes in cellulose during heat treatment

Cited by 42 publications

References 31 publications

Effect of heat treatment on colour changes of black alder and beech veneers

Effect of heat treatment on colour changes of black alder and beech veneers

Kinetic Analysis of the Color of Larch Sapwood and Heartwood during Heat Treatment

Effect of Wet Spinning and Stretching to Enhance Mechanical Properties of Cellulose Nanofiber Filament

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