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September 1994
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8 Reads
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8 Citations
Journal of Inorganic and Organometallic Polymers
Potassium derivatives of cellulose were prepared by treating of microcrystalline cellulose (MCC) with complexes of potassium (K) with ethylenediamine (EDA) and K with hexamethylphosphoric triamide (HMPT). The reaction products were characterized by X-ray diffraction,13C-NMR and FTIR spectroscopy, SEM, and EDXA.
December 1989
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2 Reads
European Journal of Wood and Wood Products
October 1989
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2 Reads
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1 Citation
Die Makromolekulare Chemie
Linters cellulose was degraded in an inert and water-free atmosphere using thermic and ultrasonic energy. The fragments were nitrated and fractionated by precipitation. A mathematical analysis of the degree of polymerization (DP) values of the differential and individual fractions resulted in a common denominator of 40 for all DPs of degraded celluloses. Also, the value of 120 occurs very frequently. Similar results were found for a series of 33 industrial pulps and some other celluloses. The smallest units in higher molecular-weight celluloses are multiples of 40 or 120 in the range of 360 to 720. The results and the calculations of this study suggest that preformed substructures obviously exist in the cellulose of higher plants which are independent of the origin of the cellulose. The sizes of the resistant substructures seem to be independent of the kind of degradation applied.
September 1989
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4 Reads
European Journal of Wood and Wood Products
February 1989
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11 Reads
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8 Citations
This is the first time that individual cellulose molecules have been visualized by electron microscopy. The specimens derive from highly diluted Solutions of cellulose in pure trifluoroacetic acid. The TFAobviously forms a solvate coating which envelops the cellulose chains whereby they become stiff. After removal of theTFA coating the cellulose molecules show a flexible structure.
February 1989
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20 Reads
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23 Citations
Wood Science and Technology
Crystallization experiments starting from highly concentrated solutions of cellulose in trifluoroacetic acid (TFA) resulted in white crystalline particles with diameters of as much as 0.5 mm. The plate-like particles consist of lamellae arranged perpendicular to the surface. The lamellae are grown from thin scale-like platelets showing clear diffraction reflexes and an internal parallel structure. Parallel structures were also detected in partially hydrolyzed cellulose. It is concluded that cellulose chains of low DP tend to rearrange themselves by a side by side accumulation of extended molecules.
October 1986
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4 Reads
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1 Citation
European Journal of Wood and Wood Products
October 1982
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2 Reads
European Journal of Wood and Wood Products
August 1982
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10 Reads
European Journal of Wood and Wood Products
January 1981
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12 Reads
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1 Citation
The Science of Nature
... Equation 4 simply shows in a compact exponential form (analysable with non-linear curve fitting algorithms allowed by modern computers) the logarithmically linearised 50-year-old models expressed in terms of DP = f(t) and analysable by graph papers and sliding rules (e.g., Stoll and Fengel 1981;Calvini 2010 and references therein). This approach was severely criticised by Sharples (Sharples 1954(Sharples , 1971, also quoted in the D&W bibliography) and most of the cellulose scientific community (as well as the referees) banned the application of D&W-like equations [DP = f(t)] to the kinetics of random degradation (e.g., Sharples 1954Sharples , 1971). ...
January 1981
... The characterization of milled wood lignin structure by NMR does, however, typically include ball-milling in order to make the lignin soluble in solvents such as dimethyl sulfoxide-d 6 . It has been confirmed that such milling anatomically destroys the plant cell walls (Fengel et al. 1978;Maurer and Fengel 1992;Fujimoto et al. 2005). Although bonds are cleaved and structures are altered somehow by milling, a relatively complete picture of milled wood lignin structure can still be demonstrated by NMR spectroscopy. ...
June 1978
Wood Science and Technology
... Similarly, the impact of IL pretreatment on hemicellulose is unknown. High-temperature acid pretreatments are very effective in converting hemicellulose to simple sugars but lead to ring opening of glucose and xylose [17,18] that produce the known microbial inhibitors furfural and hydroxyl methyl furfural [19,20]. The association of lignin with the polysaccharides has been linked directly to biomass recalcitrance [10,21,22]. ...
October 1986
European Journal of Wood and Wood Products
... Chemical compositions of some wood and nonwood fibers are given in Table 1 . Cellulose, the major component of fiber, has a high tendency to form intra-and intermolecular hydrogen bonds (Fengel and Stoll 1989). As a hydrophilic polymer, it has a high capacity for water absorption as well as limits to its barrier properties (Alavi et al. 2015). ...
Reference:
Molded pulp packaging review
February 1989
Wood Science and Technology
... Due to the alkali extraction of delignified specimen, fiber walls significantly swelled up. Therefore, the middle layer of the original compound was compressed and the surface of fiber shrunk (Stoll and Fengel, 1977). The S2 region, accordingly, had the highest cellulose concentration (Fig. 10. c). ...
December 1977
Wood Science and Technology
