Water sorption isotherms of Kraft lignin and its composites

Volkova, Natalia; Ibrahim, Victor; Hatti‐Kaul, Rajni; Wadsö, Lars

doi:10.1016/j.carbpol.2011.10.001

Cited by 41 publications

(29 citation statements)

References 33 publications

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“…This model has mainly been used to analyse food materials, pharmaceutical powders and biopolymer films, because of its broader range of applications when compared to the BET-Eq. (0.05 \ a w \ 0.8) (Agrawal et al 2004;Andrade et al 2011;Follain et al 2013;Volkova et al 2012). It assumes localized physical multilayer sorption with no lateral interactions.…”

Section: Anisole and Cyclohexane Adsorptionmentioning

confidence: 95%

Cellulose nanocrystal surface functionalization for the controlled sorption of water and organic vapours

et al. 2016

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The surface grafting of cellulose nanocrystals (CNC) is a valuable tool to increase opportunities for their application. This work had several goals designed to improve CNC: reduction of hornification, increased re-dispersibility after CNC drying, and tuning of the surface graft to enhance the adsorption of particular molecules. To achieve this, the CNC surfaces were modified chemically with aromatic surface grafts using widely employed methods: the creation of urethane linkages, silylation and esterification. Even a low degree of grafting sufficed to increase water contact angles to as much as 96°. The analysis of water sorption isotherms showed that at high water activities, capillary condensation could be suppressed and hysteresis was decreased. This indicates that hornification was significantly suppressed. However, although the contact angles increased, the water sorption isotherms were changed only slightly because of reduced hysteresis. The grafts were not able to shield the surface from water vapour sorption. A comparison of the sorption isotherms of anisole and cyclohexane, sorbates with a similar surface area, showed that the sorption of anisole was three times higher than that of cyclohexane. The specific sorption of aromatic molecules was achieved and the most efficient methodology was the esterification of CNC with carboxylic acids containing a flexible linker between the aromatic moiety and ester bond.

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Section: Anisole and Cyclohexane Adsorptionmentioning

confidence: 95%

Cellulose nanocrystal surface functionalization for the controlled sorption of water and organic vapours

et al. 2016

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“…So it is well known that lignin has enormous potential for use as a raw material in the polymer industry. In this area, commonly one modification of lignin through chemical treatment is required in order to increase its compatibility with the polymeric matrix modifying characteristics as: the molecular weight, the surface area of the lignin and the availability of OH groups (Pouteau et al, 2003;Sadeghifar et al, 2012;Volkova et al, 2012). Another concern of the background studies it is the ratio between lignin and polymer matrix (Alexy et al, 2000).…”

Section: Introductionmentioning

confidence: 98%

Kraft lignin as filler in PLA to improve ductility and thermal properties

Gordobil

Delucis

Egüés

et al. 2015

Industrial Crops and Products

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“…Rosin-sizing imparts water-repellent properties to the paper and, hence, reduces hydrophilic surface of cellulose available for the water adsorption (Hubbe 2011). Lignin in turn shows higher water adsorption than cellulose in the entire RH range (Rawat and Khali 1999;Volkova et al 2012). As the result, machine made paper materials used in the same book printed in 1898 exhibited the highest and the lowest water vapour adsorption by lignin-rich unsized paperboard in the binding and lignin-free, alum/rosin sized paper, respectively, measured in this study (Fig.…”

Section: Materials Typementioning

confidence: 71%

Moisture sorption and diffusion in historical cellulose-based materials

et al. 2018

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Moisture adsorption and diffusion were examined in 17 samples of historical and modern papers and cardboards, differing in the time of production and the pulping process. The moisture adsorption data for paper materials made of rags, gelatin-sized were close to each other whereas woodpulp papers showed higher intra-group variability due to varying contents of lignin and rosin sizing. The average adsorption curve for all specimens was close to that of pure cellulose. In-plane diffusivities along the paper sheets in a stack, primary direction of uptake and release moisture by library objects, were determined as a function of relative humidity and paper compression. Typically, the in-plane diffusivities fell within the range of 6 9 10 -6 -1.7 9 10 -5 m 2 /s and were significantly affected by the paper fraction in the specimens which were combination of paper sheets and thin air layers or pockets between the sheets. The external mass transfer coefficient at the surface of the paper objects perpendicular to the paper sheets exceeded 2 9 10 -3 m/s and significantly depended on the intensity of air motion in typical environments. Effective use of the adsorption and diffusion information obtained was demonstrated in modelling buffering capacities of books.

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Water sorption isotherms of Kraft lignin and its composites

Cited by 41 publications

References 33 publications

Cellulose nanocrystal surface functionalization for the controlled sorption of water and organic vapours

Cellulose nanocrystal surface functionalization for the controlled sorption of water and organic vapours

Kraft lignin as filler in PLA to improve ductility and thermal properties

Moisture sorption and diffusion in historical cellulose-based materials

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