Cooperativity analysis of the in situ lignin glass transition

Laborie, Marie‐Pierre; Salmén, Lennart; Frazier, Charles E.

doi:10.1515/hf.2004.018

Cited by 33 publications

(24 citation statements)

References 15 publications

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“…The current challenge lies not in finding the gene targets and manipulating their expression, but in understanding how the genetic alterations impact the mechanical properties of the living tree and the wood products derived from it. Research in this area-the biomechanics of transgenic wood-will not only enable us to increase the economic value of wood by improving specific traits such as increased strength, controlling the formation of reaction wood or the ease of fiber separation for pulping, but it also harbors the potential for answering fundamental questions of structural arrangement of cell wall components Laborie et al, 2004) and their interactions in defining the bulk mechanical properties Zhong et al, 2005). From a technical perspective, these objectives will benefit from efficient methods for multiple-gene transformation that enable the simultaneous modifications of multiple cell-wall traits (Chabannes et al, 2001a;Abbott et al, 2002;Li et al, 2003).…”

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confidence: 99%

Biomechanics and transgenic wood

Koehler

Telewski

2006

American J of Botany

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Wood, or secondary xylem, is composed mostly of three components-cellulose, hemicelluloses, and lignin. Yet this apparent simplicity is deceiving because the sophisticated arrangement of the components on various structural levels, ranging from intricate molecular architecture to defined cellular arrangements to tissue morphology, makes wood a challenging and interesting subject of biomechanical investigation. Recent advances in genetic transformation, providing easier access to wood of specifically altered composition or structure, have opened new opportunities for research on the intricate relation between material structure and composition and mechanical properties. At the same time, investigations into the mechanical properties have provided new information regarding the structural configuration of wood. The present paper reviews the work conducted in this field and outlines future perspectives and prospects for research.

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mentioning

confidence: 99%

Biomechanics and transgenic wood

Koehler

Telewski

2006

American J of Botany

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“…Lower E a for wood swelling in ILs is consistent with the lower T g (ca. 60 ° C) for in situ lignin in these ILs compared to water (84 ° C) or ethylene glycol (74 ° C) ( Salm é n 1984 ; Laborie and Salm é n 2004 ). This is also evidently much lower than the literature values for the T g of dried isolated solid lignin ( T g ∼ 200 ° C) ( Goring 1963 ; Salm é n 1984 ).…”

Section: Viscoelastic Behavior Of Norway Spruce Swollen In Ilsmentioning

confidence: 68%

“…For example, Salm é n (1984) found E a in the order of 395 kJ.mol -1 for in situ lignin α -relaxation in water-saturated spruce. The frequency dependency of the relaxation in wood swollen in [BMIM]Ace at 120 ° C for 4 h ( Figure 4 a) allows calculating an apparent activation energy for the observed softening of 147 kJ.mol -1 , in agreement with an α -relaxation (Figure 4b) are lower than the corresponding data of spruce saturated in water ( Salm é n 1984 ) or in organic solvents such as ethylene glycol (252 kJ.mol -1 ) ( Laborie and Salm é n 2004 ). Lower E a for wood swelling in ILs is consistent with the lower T g (ca.…”

Section: Viscoelastic Behavior Of Norway Spruce Swollen In Ilsmentioning

confidence: 82%

Swelling, viscoelastic, and anatomical studies on ionic liquid-swollen Norway spruce as a screening tool toward ionosolv pulping

Abushammala¹,

Pontes²,

Gomes

et al. 2015

Holzforschung

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To screen ionic liquid (IL) candidates for wood ionosolv pulping, swelling and viscoelastic studies on Norway spruce wood treated with ionic liquids have been conducted. In particular, the temperature dependency and kinetics of swelling in 1-butyl-3-methylimidazolium acesulfamate ([BMIM]Ace) and in 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) were in focus. The kinetics of volumetric swelling in [BMIM]Ace yielded an E a of 54 kJ.mol -1 compared to 23 kJ.mol -1 in [EMIM]OAc. The viscoelastic behavior of IL-swollen wood was studied by dynamic mechanical analysis, and the lowest in situ glass transition temperature ( T g ) of lignin was ∼ 58 ° C and ∼ 65 ° C in [BMIM]Ace and in [EMIM]OAc, respectively. These T g values are lower than that found in water. Higher T g was calculated by the Gordon-Taylor equation, which means that swelling is not only due to the plasticizing effect of the ILs. SEM images showed that [EMIM]OAc has a stronger plasticizing effect than [BMIM]Ace. Overall, [EMIM]OAc is the most efficient agent for wood swelling, softening, and disintegration and, thus, it is the most promising candidate for ionosolv pulping.

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“…The T g values are found in a wide temperature range depending on plant species, isolation methods, and post treatments (Hatakeyama et al 1982;Glasser and Jain 1993;Jain and Glasser 1993;Hatakeyama and Quinn 1999;Laborie et al 2004;Li and Sarkanen 2005). As shown in Fig.…”

Section: Glass Transition Temperature Of Ehlmentioning

confidence: 89%

Glass Transition of Oxygen Plasma Treated Enzymatic Hydrolysis Lignin

Zhou¹,

Zheng²,

Liu³

et al. 2012

BioResources

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This study investigated the effect of oxygen plasma treatment on the glass transition temperature of enzymatic hydrolysis lignin (EHL) derived from the production of bio-ethanol. Differential scanning calorimetry (DSC) was used to obtain the glass transition temperature (T g ) of EHL. The results showed that the T g value of EHL under different heating rates ranged from 160 to 200 °C, and there was a strong linear correlation between heating rate and T g . The T g value of oxygen plasma treated EHL decreased when compared with the untreated samples. The apparent T g of the untreated sample was 168.2 °C, while the value of the treated sample was 161.5 °C. Distinct chain scission and introduction of oxygen-based functional groups on the surface of EHL were detected by XPS analysis. These changes may occur mainly on the bulky side chain and thus enhance molecular mobility of EHL. This indicates that oxygen plasma treatment can modify the structure and improve the reactivity of EHL efficiently.

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Cooperativity analysis of the in situ lignin glass transition

Cited by 33 publications

References 15 publications

Biomechanics and transgenic wood

Biomechanics and transgenic wood

Swelling, viscoelastic, and anatomical studies on ionic liquid-swollen Norway spruce as a screening tool toward ionosolv pulping

Glass Transition of Oxygen Plasma Treated Enzymatic Hydrolysis Lignin

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