Cellulose Studies

Steele, Richard; Pacsu, Eugene

doi:10.1177/004051754901901203

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…Several authors, without adequate justification, have attributed some of the bands in the 1300-1400 cm-1 region to alcoholic c-o [153], or to CH bonds [137,143,149]. The latter attribution can only be partially, if at all, correct, because the total decrease in the number of CH groups on oxidation of cellulose by nitrogen oxides is small, whereas the change in intensity of bands in this region is very considerable.…”

Section: Possibilities Of the Methods For Further Researchmentioning

confidence: 99%

“…On this basis he concluded that dissolution of the cellulose esters was molecular in nature. The spectrum of trimethylcellulose was investigated by Stelle and Pacsu [153]. Brown, Holiday, and Trotter [154] studied the infrared spectra of cyanoethylcellulose, ethylcellulose, acetylcellulose, acetobutyrylcellulose, etc., in the regions of the main frequencies of OH and CH groups.…”

Section: Cellulose Esters and Ethersmentioning

confidence: 99%

“…The spectra of these and other oxidized celluloses are given in Figs. 62 and 63 (Appendix VI, [143][144][145][146][147][148][149][150][151][152][153][154][155][156][157][158][159][160].…”

Section: Oxidation Products Of Cellulose and Their Salts 119mentioning

confidence: 99%

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Infrared Spectra of Cellulose and its Derivatives

Zhbankov¹

1995

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FOREWORDThis monograph is concerned with systematization of the infrared spectra of an important natural polymer, cellulose, and its derivatives.The infrared spectra of the main classes of cellulose derivatives are described and interpreted and those of such model compounds as mono-, di-, and trisaccharides are considered. Considerable attention is given to problems of technique in obtaining infrared spectra of fibrous cellulose materials, and to the analytical possibilities of infrared spectroscopy in studies of the properties of cellulose and its derivatives.The book will be of use to scientific and plant workers interested in the study and treatment of cellulose, compounds related to cellulose (carbohydrates and polycarbohydrates), and other polymers.

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Section: Possibilities Of the Methods For Further Researchmentioning

confidence: 99%

Section: Cellulose Esters and Ethersmentioning

confidence: 99%

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Infrared Spectra of Cellulose and its Derivatives

Zhbankov¹

1995

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“…In wood, this range is dominated by the 1 st overtone of o-H stretching vibrations arising mainly from carbohydrates and has always been of interest to researchers. In the late 1930s, rodebush and Buswell 92 and Buswell et al 93 were among the first to realise that the breadth of absorption bands associated with o-H or n-H bond-stretching vibrations was associated with a hydrogen-bonding interaction between an acidic group and another basic atom. a simple operational definition of the hydrogen bond is that it exists when a hydrogen atom is bonded to two or more atoms, thus weakening the o-H bond.…”

Section: To 6000 CM -1 (1486-1667 Nm)mentioning

confidence: 99%

“…the stronger the bonds (and, therefore, the smaller the distance), the weaker the o-H bond and the lower the wavenumber (the higher the wavelength) at which this band is found. Buswell et al 93 studied the effect of hydrogen bonding upon the infrared absorption of the hydroxyl group. although early investigations of cellulose and its crystal and molecular structure 94-96 along with its crystalline transformations between the cellulose polymorphs were primarily investigated in the mid-Ir, in 1940, ellis and Bath 97 used nIr for their study of hydrogen bridging in cellulose.…”

Section: To 6000 CM -1 (1486-1667 Nm)mentioning

confidence: 99%

A Review of Band Assignments in near Infrared Spectra of Wood and Wood Components

Schwanninger

Rodrigues

Fackler

2011

Journal of Near Infrared Spectroscopy

532

479

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Near infrared (NIR) spectra of wood and wood products contain information regarding their chemical composition and molecular structure. Both influence physical properties and performance, however, at present, this information is under-utilised in research and industry. Presently NIR spectroscopy is mainly used following the explorative approach, by which the contents of chemical components and physico-chemical as well as mechanical properties of the samples of interest are determined by applying multivariate statistical methods on the spectral data. Concrete hypotheses or prior knowledge on the chemistry and structure of the sampleexceeding that of reference data-are not necessary to build such multivariate models. However, to understand the underlying chemistry, knowledge on the chemical/functional groups that absorb at distinct wavelengths is indispensable and the assignment of NIR bands is necessary. Band assignment is an interesting and important part of spectroscopy that allows conclusions to be drawn on the chemistry and physico-chemical properties of samples. To summarise current knowledge on this topic, 70 years of NIR band assignment literature for wood and wood components were reviewed. In addition, preliminary results of ongoing investigations that also led to new assignments were included for discussion. Furthermore, some basic considerations on the interactions of NIR radiation with the inhomogeneous, anisotropic and porous structure of wood, and what impact this structure has on information contained in the spectra, are presented. In addition, the influence of common data (pre)-processing methods on the position of NIR bands is discussed. For more conclusive band assignments, it is recommended that wood is separated into its components. However, this approach may lead to misinterpretations when evaluation methods other than direct comparison of spectra are used, because isolation and purification of wood components is difficult and may lead to chemical and structural alterations when compared to the native state. Furthermore, "pure" components have more distinct and symmetric bands that influence the shape of the spectra. This extended review provides the reader with a comprehensive summary of NIR bands, as well as some practical considerations important for the application of NIR to wood.

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Über Polygalakturonsäureamide

Solms

Denzler

Deuel

1954

Helvetica Chimica Acta

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Volumen xxxvu, Faaciculus VII (1954) -Xo. 250. Unver-Mit esterto Methanol Carboxyl-vcresterte gruppen Carboxyl-(x) In aruppen (Y) Milliiq. in Milliaq. pro g pro p. 4,35 0,05 1,30 3,10 0,OO 4,40 2153 Vercsternnge grad in yo 1 s 70,B 100,O 250. b r Polygalakturonsaureamide von J. Solms, A. Denzler und H. Deuel. (12. x. 54.)Galakturonsaure-und Polygalakturousiiure-methylester konnen durch Behandlung rnit Ammoniak i n die entsprechenden Amide iibergefuhrt werdenl). Dabei zeigen die Polygalakturonsauren mit steigendem Amidierungsgrad eine abnehmende Ikislichkeit in Wasser und ergeben Losungen geringer Viskositat, die leicht durch Elektrolyte koaguliert werden konnenz). Diese Eigenschaften wurden auf die Fahigkeit der Amidgruppen zuriickgefiihrt, inter-und intramolekulaxe Wasserstoffbrucken zu bilden. Doch konnten sie teilweise auch auf einem Abbau der Fadenmolekeln wahrend der Umsetzung beruhen, da glykosidische Bindungen der Polygalakturonsaure moglicher.~eise alkalilabil sind, wenn die Carboxylgruppen verestert sind3).

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Cellulose Studies

Cited by 10 publications

References 6 publications

Infrared Spectra of Cellulose and its Derivatives

Infrared Spectra of Cellulose and its Derivatives

A Review of Band Assignments in near Infrared Spectra of Wood and Wood Components

Über Polygalakturonsäureamide

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