Micronized (and Microcrystalline) Celluloses. Obtainment and Fields of Application

Vasiliu‐Oprea, Cleopatra; Nicoleanu, J.

doi:10.1080/03602559308019227

Cited by 10 publications

(7 citation statements)

References 7 publications

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“…This of course is unsatisfactory and may give rise to systematic errors. It is true, that various methods to reduce the crystallinity of cellulose have been described in the literature, notably chemical (Manley 1963;Wadehra and Manley 1965;Hatakeyama et al 1976;Treiber 1957) and mechanical ones (Hess et al 1941;Hermans and Weidinger 1946;Vasiliu-Oprea and Nicoleanu 1993). There are, however, only very few studies in which it has been demonstrated that a given diffraction curve was due mainly to the amorphous phase, because it was not changed any more on prolonged amorphization treatment.…”

Section: Introductionmentioning

confidence: 91%

An X-Ray Diffraction Study of the Crystalline to Amorphous Phase Change in Cellulose During High-Energy Dry Ball Milling

Stubičar¹,

Šmit²,

Stubičar³

et al. 1998

Holzforschung

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In methods used widely for determining "crystallinity" of cellulose substrates by X-ray wide angle diffraction the scattering characteristics of truly "amorphous" cellulose is needed. So far, such scattering curves have not been available. It was the aim of this study to arrive at an experimentally determined scattering curve of amorphous cellulose. For this purpose, two cellulose samples (a pine wood pulp and a microcrystalline powder) were ball milled in a high-energy equipment in order to destroy the crystalline structure. The structural changes in the cellulose samples and the kinetics of amorphization were followed by taking X-ray diffractograms. After 30 min of milling, no more change in the structure could be observed and the diffraction curve of amorphous cellulose with two diffuse maxima at spacings of 0.427 nm (strong) and 0.247 nm (weak) was obtained. The amorphization was found to follow a first order kinetics, the rate constant of k = (0.0033 ± 0.0004) s" 1 holding for both samples. However, while the amorphization of the microcrystalline cellulose started immediately, with the wood pulp sample an induction period of about 300 seconds was observed, which is probably due to residual morphological structures present in this sample.

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Section: Introductionmentioning

confidence: 91%

An X-Ray Diffraction Study of the Crystalline to Amorphous Phase Change in Cellulose During High-Energy Dry Ball Milling

Stubičar¹,

Šmit²,

Stubičar³

et al. 1998

Holzforschung

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“…As calculated from the X-ray data, the crystallinity of MCC samples obtained from wood (67-74%) are close to the crystallinity of industrial MCC Avicel PH 102 (64%) [6] and MCC from cotton linter (80%) ( Table 3).…”

Section: Resultsmentioning

confidence: 79%

“…The crystallinity of MCC samples obtained from aspen wood and birch wood, calculated from the infrared spectra in respect of the absorption bands (D1370/ Cotton linter [6] 0.80 5.8 Fig. 3 X-ray spectra of MCC obtained from aspen wood (1) and birch wood (2) D2900) varies between 70 and 80%.…”

Section: Resultsmentioning

confidence: 99%

“…Traditional technologies of MCC production from wood include stages of wood delignification, pulp bleaching and mild hydrolysis to remove easily hydrolyzable polysaccharides [6]. The use of sulfur and chlorine-containing reagents in the stages of delignification and bleaching makes traditional multi-stage technology of MCC production dangerous for the environment.…”

Section: Introductionmentioning

confidence: 99%

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A green one-step process of obtaining microcrystalline cellulose by catalytic oxidation of wood

Кузнецов

Кузнецова

Данилов

et al. 2011

Reac Kinet Mech Cat

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A green one-step catalytic process of obtaining microcrystalline cellulose (MCC) from wood in the medium ''acetic acid-hydrogen peroxide-water'' in the presence 2% wt. sulfuric acid catalyst is described. The influence of wood nature and conditions of the process on the yield, composition and structure of obtained samples of MCC was investigated. For hardwood (aspen wood and birch wood) the minimal content of residual lignin (\1% wt.) was achieved under the following conditions: temperature 130°C, the concentration of H 2 O 2 4% wt., the concentration of CH 3 COOH * 26% wt., liquor ratio of 10 and the process time of 3 h. At these conditions, the degree of delignification of softwood (spruce wood and larch wood) is lower than for hardwood. According to X-ray and FTIR data, the structure of MCC samples obtained from wood is close to that of MCC Avicel and MCC from cotton linter.

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“…MCC is widely utilized in various industries and applications, e.g., rheology modifiers, food ingredients (thickeners, emulsion stabilizers, fat mimetics), pharmaceuticals (as a tableting aid), and chromatography (Vasiliu-Oprea and Nicoleanu 1993;BeMiller 2009;Tuason et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Conventional and Lignin-Rich Microcrystalline Cellulose

Vanhatalo¹,

Maximova²,

Perander³

et al. 2016

BioResources

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a Three microcrystalline cellulose (MCC) samples were manufactured from bleached and unbleached softwood kraft pulp, and their properties were compared to those of the commercial MCC, Avicel PH-101. One of the produced samples retained a large portion of lignin (10.3%), while the two others retained only some. The physical, chemical, thermogravimetric, and molecular properties were analyzed. The presence of lignin caused a substantial effect on the thermogravimetric and chemical properties of the MCC, as well as on its surface characteristics. The lignin-containing sample degraded at lower temperatures, and its UV Raman spectra had a high intensity aromatic band (1600 cm -1 ) arising from the lignin. X-ray photoelectron spectroscopy confirmed a high surface lignin coverage (40%) in this specimen only. Particle size and BET surface area measurement results varied in some limits between MCCs, while the cellulose crystallinity index showed almost equal values between 0.82 and 0.84. This work introduces a new wood-based product, the lignincontaining MCC, comparable in properties to the wide-marketed Avicel.

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Micronized (and Microcrystalline) Celluloses. Obtainment and Fields of Application

Cited by 10 publications

References 7 publications

An X-Ray Diffraction Study of the Crystalline to Amorphous Phase Change in Cellulose During High-Energy Dry Ball Milling

An X-Ray Diffraction Study of the Crystalline to Amorphous Phase Change in Cellulose During High-Energy Dry Ball Milling

A green one-step process of obtaining microcrystalline cellulose by catalytic oxidation of wood

Comparison of Conventional and Lignin-Rich Microcrystalline Cellulose

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