Molecular Weight of Native Cellulose

Gralén, Nils; Svedberg, The

doi:10.1038/152625a0

Cited by 48 publications

(25 citation statements)

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“…Cellulose early on became an important study object among polymer physical chemists and Svedberg would return to such studies. 1,2 A central part of these and other attempts to characterize cellulose molecules was obviously to dissolve cellulose, and several solvents, more or less exotic, were developed, inter alia for molecular weight determination. 3 In this early period, researchers typically investigated different macromolecules in parallel and comparing solubility characteristics of different polymers was helpful for understanding the intermolecular interactions involved.…”

Section: Introductionmentioning

confidence: 99%

The relevance of structural features of cellulose and its interactions to dissolution, regeneration, gelation and plasticization phenomena

Lindman

Medronho

Alves

et al. 2017

Phys. Chem. Chem. Phys.

187

109

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aCellulose is the most abundant polymer and a very important renewable resource. Since cellulose cannot be shaped by melting, a major route for its use for novel materials, new chemical compounds and renewable energy must go via the solution state. Investigations during several decades have led to the identification of several solvents of notably different character. The mechanisms of dissolution in terms of intermolecular interactions have been discussed from early work but, even on fundamental aspects, conflicting and opposite views appear. In view of this, strategies for developing new solvent systems for various applications have remained obscure. There is for example a strong need for using forest products for higher value materials and for environmental and cost reasons to use water-based solvents. Several new water-based solvents have been developed recently but there is no consensus regarding the underlying mechanisms. Here we wish to address the most important mechanisms described in the literature and confront them with experimental observations. A broadened view is helpful for improving the current picture and thus cellulose derivatives and phenomena such as fiber dissolution, swelling, regeneration, plasticization and dispersion are considered. In addition to the matter of hydrogen bonding versus hydrophobic interactions, the role of ionization as well as some applications of new knowledge gained are highlighted.

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Section: Introductionmentioning

confidence: 99%

The relevance of structural features of cellulose and its interactions to dissolution, regeneration, gelation and plasticization phenomena

Lindman

Medronho

Alves

et al. 2017

Phys. Chem. Chem. Phys.

187

109

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show abstract

“…This deviation may be real, which would suggest that at higher values of molecular weight, the value of [17] may increase less rapidly than M" (i. e., the value of a is less than unity in the equation h]=KMa). R' esults of this type have been obtained by Gralen and Svedberg for cellulose in cuprammonium [3]. It should be noted, however, that these fractions cover the usual molecular-weight range of commercial cellulose acetates.…”

Section: ------------------------------------------------{ -----mentioning

confidence: 99%

“…3 The intrinsic viscosities and the osmotically estimated molecular weights of these fractions and of the starting material have now been determined in acetone solutions. This paper, which presents the results of these measurements, shows that for this type of acetate and within the range of chain lengths investigated, the system cellulose acetate in acetone does conform to Staudinger's rule; i. e., for this system the constant a has the value unity in the relationship cited above.…”

Section: Introductionmentioning

confidence: 99%

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Intrinsic viscosities and osmotic molecular weights of cellulose acetate fractions

Sookne¹,

Harris²

1945

J. RES. NATL. BUR. STAN.

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The intrinsic viscosities and osmotically estimated number-average molecular weights of a series of cellulose acetate fractions have been m easured. It was found that within t he range of chain lengths investigated (number-average molecular weight, lvin, up to 130,000) the number-average molecular weights are proportional to the intrinsic viscosities in acetone solu tions, in agreement with St audinger's rule and the results of Kraemer. An estimate is provided of the r elative homogeneity with respect to molecular size of the fraction s and the starting material from which they were prepared.

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“…A polimert felépítő cukor egységek száma 200 és 14000 egység közé tehető. Ezt a tág intervallumot 200-300 egységre szűkíthetjük mikrokristályos cellulóz esetén [67,68]. A cellulóznak több megjelenési formája is van, de szelektorként leggyakrabban a natív cellulózt használják, illetve ennek derivatizált változatait.…”

Section: Módosított Poliszacharidokunclassified

Enantiomer elválasztás és felismerés nagyhatékonyságú folyadékkromatográfiás rendszerekben

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Molecular Weight of Native Cellulose

Cited by 48 publications

References 5 publications

The relevance of structural features of cellulose and its interactions to dissolution, regeneration, gelation and plasticization phenomena

The relevance of structural features of cellulose and its interactions to dissolution, regeneration, gelation and plasticization phenomena

Intrinsic viscosities and osmotic molecular weights of cellulose acetate fractions

Enantiomer elválasztás és felismerés nagyhatékonyságú folyadékkromatográfiás rendszerekben

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