The hygroscopic power of amorphous cellulose: A modeling study

Mazeau, K.

doi:10.1016/j.carbpol.2014.09.095

Cited by 32 publications

(15 citation statements)

References 52 publications

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“…The estimated volume hygroexpansion (% vol) of amorphous cellulose was 0.0097% for 0-36% hydration level (m.c.) [74]. Similar is found for different microcrystalline celluloses where a higher crystallinity led to a lower moisture content below 75% r.h. At 75% r.h. crystallinity indexes of 45-95% led to moisture contents of 12-6% m.c., respectively.…”

Section: Hygroexpansion Of Cellulosesupporting

confidence: 83%

Factors affecting the hygroexpansion of paper

Lindner

2017

J Mater Sci

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Paper is a widely used packaging material and is nowadays regaining importance, e.g., as bio-based and biodegradable material. Moreover, new technologies such as polymer-fiber composites, printed electronics and the deep drawing of paper are developing. The process stability and also the resulting quality of paper converting processes such as coating, metallization, printing, and the printing of electronics are highly affected by the hygroexpansion of paper. In order to reduce production instability and to choose and develop paper substrates with ideal characteristics, critical parameters need to be known. This paper offers an extensive overview of those parameters, starting at a molecular and microscopic level with the effect of the constituents and morphology of single fibers, before moving on to paper contents, chemical modifications and additives and finally concluding with paper production and fiber network modification. It was found that the major influences are single fiber sorption, inter-fiber contacts, microfibril angle, fiber morphology (length, width, curliness) and fiber orientation. This review gives new ideas and insights for technologists working in research, development and production optimization of paper-based products.

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Section: Hygroexpansion Of Cellulosesupporting

confidence: 83%

Factors affecting the hygroexpansion of paper

Lindner

2017

J Mater Sci

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“…The clustering and specific adsorption may sterically hinder water adsorption to nearby sites until there is sufficient water to create a percolating network through the sample (Kulasinski et al 2014). Moreover, RH values above 75 % or EMCs above 9 % have been linked to void or capillary filling (Kulasinski et al 2014;Mazeau et al 2015). Unlike cellulose fibrils in BC, pulp fibrils are further arranged into denser cell wall structures ( Fig.…”

Section: Nature Of the Hygroscopic Changesmentioning

confidence: 99%

Changes in the hygroscopic behavior of cellulose due to variations in relative humidity

2017

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Details on how cellulosic surfaces change under changing moisture are incomplete and even existing results are occasionally neglected. Unlike sometimes reported, water adsorption is unsuitable for surface area measurements. However, water can be utilized for assessing surface dynamics. Hygroscopic changes of pulp and bacterial cellulose were studied by dehydrating the samples in a low polarity solvent and then introducing them into a moist atmosphere in a Dynamic Vapor Sorption (DVS) apparatus at 0-93 % Relative Humidity (RH). The DVS treatment caused hygroscopicity loss near applied RH maxima, however, the hygroscopicity increased at RH values > 10-20 % units lower. Additionally, the hygroscopic changes were partially reversible near the RH maximum. Therefore the hygroscopicity of cellulose could be controlled by tailoring the exposure history of the sample. Hornification reduced these changes. The observations support reported molecular simulations where cellulose was shown to restructure its surface depending on the polarity of its environment.

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“…Most reactants only penetrate into the amorphous region of cellulose, which is more susceptible to water . This endows the amorphous cellulose with special properties, such as excellent hygroscopic power and solubility in 1 N sodium hydroxide, which makes it significant to prepare this kind of cellulose. However, it is difficult to isolate amorphous cellulose from the native microfibrils.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of cellulose membrane with “imprinted morphology” and low crystallinity from spherulitic [Bmim]Cl

Qiao

Hou

et al. 2016

J of Applied Polymer Sci

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In the present study, regenerated cellulose membrane with "imprinted morphology" and low crystallinity was fabricated from the crystal cellulose/[Bmim]Cl solution. Spherulites of 1-butyl-3-methilimidazolium chloride ([Bmim]Cl) and cellulose/ [Bmim]Cl solution were observed using polarized optical microscopy under certain condition. The fabricated cellulose membranes presented some particular characteristics compared with the membrane prepared from traditional cellulose/[Bmim]Cl solution. All the fabricated membranes were characterized by optical microscope, Wide-angle X-ray diffraction (WAXD), thermo-gravimetric analysis, and mechanical testing. The images showed that the resulting membranes prepared from crystal cellulose/[Bmim]Cl solution were "imprinted" with patterns which originated from the crystalline structure of [Bmim]Cl. The results of WAXD showed that the obtained cellulose membrane exhibited low diffraction peaks and crystallinity of approximately 24.57%. Furthermore, the low crystallinity led to the low mechanical property (27.5 MPa), thermal stability (315.4 8C), and high moisture regain (9.5%). V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43798.

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The hygroscopic power of amorphous cellulose: A modeling study

Cited by 32 publications

References 52 publications

Factors affecting the hygroexpansion of paper

Factors affecting the hygroexpansion of paper

Changes in the hygroscopic behavior of cellulose due to variations in relative humidity

Fabrication of cellulose membrane with “imprinted morphology” and low crystallinity from spherulitic [Bmim]Cl

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