Crystalline structure and packing of mannan I

Atkins, E. D. T.; Farnell, Sheila; Burden, Cenydd; Mackie, William; Sheldrick, B.

doi:10.1002/bip.360270705

Cited by 32 publications

(15 citation statements)

References 13 publications

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“…The 100% crystalline mannan diffraction pattern was calculated using the known crystal structure and atomic coordinates of mannan I (Atkins et al 1988) and the 0% crystalline pattern (i.e., amorphous or non-crystalline background) was measured from a pure mannan powder sample. In the fitting procedure, the diffraction peaks of crystalline mannan were varied.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Composite films from spruce galactoglucomannans with microfibrillated spruce wood cellulose

et al. 2011

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Two future wood biorefinery products, spruce galactoglucomannans (GGM) and microfibrillated spruce wood cellulose (MFC), were mixed to form composite films. The films were plasticized with different amounts of glycerol, and the preparation of films was successful even with low glycerol contents. The film properties were studied using optical microscopy and scanning electron microscopy, x-ray diffraction, water sorption, dielectric analysis, moisture scanning dynamic mechanical analysis, and tensile testing. The addition of MFC clearly affected the properties of the films by decreasing the moisture uptake and increasing the relative humidity of softening of the films and by increasing the glass transition temperature, tensile strength, and Young's modulus of the films. The effect of MFC addition on the tensile properties of films was emphasized at low glycerol contents. The addition of MFC did not affect the degree of crystallinity of GGM in the films, which was between 20 and 25%. MFC can be efficiently used as reinforcement of GGM films to form wood-based composite materials and to prepare GGM-based films and coatings with low plasticizer content.

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Section: X-ray Diffractionmentioning

confidence: 99%

Composite films from spruce galactoglucomannans with microfibrillated spruce wood cellulose

et al. 2011

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“…The 100% crystalline mannan diffraction pattern was calculated using the known crystal structure and atomic coordinates of mannan I (Atkins et al 1988). Cellulose (2010) 17:69-81 71 The positions, intensities, and widths of all the reflections of mannan I in the angular range of 5°-60°w ere calculated, using PowderCell 2.4 computer software (Institute for Molecules and Materials, Radboud University Nijmegen, Nijmegen, The Netherlands) (Kraus and Nolze 1996).…”

Section: X-ray Diffractionmentioning

confidence: 99%

Glucomannan composite films with cellulose nanowhiskers

et al. 2009

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Spruce galactoglucomannans (GGM) and konjac glucomannan (KGM) were mixed with cellulose nanowhiskers (CNW) to form composite films. Remarkable effects of CNW on the appearance of the films were detected when viewed with regular and polarizing optical microscopes and with a scanning electron microscope. Addition of CNW to KGMbased films induced the formation of fiberlike structures with lengths of several millimeters. In GGMbased films, rodlike structures with lengths of several tens of micrometers were formed. The degree of crystallinity of mannan in the plasticized KGM-based films increased slightly when CNW were added, from 25 to 30%. The tensile strength of the KGM-based films not containing glycerol increased with increasing CNW content from 57 to 74 MPa, but that of glycerol-plasticized KGM and GGM films was not affected. Interestingly, the notable differences in the film structure did not appear to be related to the thermal properties of the films.

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“…amorphous, or non-crystalline, background) was measured from the pure rye arabinoxylan film . The diffraction pattern of crystalline GGM was computed on the basis of the known crystal structure of mannan I (Atkins et al 1988). The non-crystalline background was measured from the filtrated and lyophilized GGM powder.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Long-Term Physical Stability of Plasticized Hemicellulose Films

Heikkinen¹,

Mikkonen²,

Koivisto³

et al. 2013

BioResources

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aOat spelt arabinoxylan (OsAX) and spruce galactoglucomannan (GGM) are hemicelluloses that can be extracted in large quantities from sidestreams of the agriculture and forest industries. They both form selfstanding films, making them potential future packaging materials. This systematic study focuses on the effect of long-term storage on the physical stability of hemicellulose-based films. OsAX and GGM films were plasticized with 40% (w/w of the polysaccharide) of glycerol, sorbitol, or their blends, and their stability was followed for four months. Ageing especially affected the glycerol-containing films, in which the tensile strength and Young's modulus increased and elongation at break decreased. Although the mechanical properties were altered, storage did not affect crystallinity of the films. Oxygen gas permeability (OP) and water vapor permeability (WVP) properties were monitored in OsAX films. Interestingly WVP decreased during storage; more than a 40% decrease was seen when plasticizer blends contained 50% or more glycerol. In contrast, there were no drastic changes in the OP during storage; all the OPs obtained were between 3.7 and 8.9 [cm 3 µm/ (m 2 d kPa)].

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Crystalline structure and packing of mannan I

Cited by 32 publications

References 13 publications

Composite films from spruce galactoglucomannans with microfibrillated spruce wood cellulose

Composite films from spruce galactoglucomannans with microfibrillated spruce wood cellulose

Glucomannan composite films with cellulose nanowhiskers

Long-Term Physical Stability of Plasticized Hemicellulose Films

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