Chain conformations in cellulose I and cellulose II

Manjunath, B. R.; Peacock, N.

doi:10.1002/app.1972.070160520

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…In the process of mercerization, the whole fiber was transformed into the swollen state. The assembly and direction of microfibers were broken, and the parallel chain structure of cellulose-I was transformed into the anti-parallel chain structure of cellulose-II (Manjunath and Peacock 1972). Meanwhile, the results above also indicated that the small amount nanocellulose was not able to increase the cellulose-I in the ANF with the cellulose prepared by the acid-alkali method.…”

Section: Xrd Analysismentioning

confidence: 94%

Crystalline structure analysis of all-cellulose nanocomposite films based on corn and wheat straws

Bian

Yang

2021

BioRes

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Cellulose solution and nanocellulose were prepared from corn straw and wheat straw and then used to fabricate an all-cellulose nanocomposites film (ANF). The crystal structure (CS) of ANFs was analyzed by X-ray diffraction (XRD) and Fourier transform infrared spectrometry (FTIR). Cellulose-I and cellulose-II were found to coexist within regenerated cellulose films (RCF) and ANFs. With the change of nanocellulose content, the proportions of cellulose-I and cellulose-II changed. Cellulose transformation was found to depend on the raw material and the preparation method. When cellulose solution was prepared from corn straw that had been extracted, the cellulose type tended to be transformed from cellulose-I to cellulose-II; the proportion of cellulose-I showed a tendency to increase when nanocellulose content exceeded 1.5%. When the dissolved cellulose had been treated by an acid-alkali method, the results did not follow a clear pattern. However, when cellulose solution was prepared from wheat straw, under extraction method, the cellulose type tended to transform from cellulose-I to cellulose-II; under acid-alkali method, cellulose-I did not follow a clear pattern with nanocellulose content. Though the small amount of nanocellulose can’t dominate the content of cellulose-I, it could cause an increase in disorder of the cellulose matrix.

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Section: Xrd Analysismentioning

confidence: 94%

Crystalline structure analysis of all-cellulose nanocomposite films based on corn and wheat straws

Bian

Yang

2021

BioRes

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The correlation between X‐ray orientation parameters and strength of fibers in native cotton

Moharir

Louwagie

Langenhove

et al. 1992

J of Applied Polymer Sci

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SYNOPSISThis paper reviews the relationship between tensile strength of native cotton fibers and the various orientation parameters and the true spiral angle. It is concluded that the Hermans crystallite orientation factor and the average angle of crystallite orientation, a,, deduced from it are the best parameters to characterize fiber strength. Moreover, a , represents a closer approximation to the true spiral angle in cotton than do the 50% or 75% X-ray angles. It is recommended that cotton breeders characterize fiber strength and screen genotypes on the basis of the Hermans factor and a, rather than the 40, 50, or 75% X-ray angles.

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Chain conformations in cellulose I and cellulose II

Abstract: SynopsisThere is strong evidence in the literature that cellulose chains have different conformations, as well as forming different crystalline lattices, in cellulose I and cellulose 11. New data on the birefringence of amine-treated fibers (cellulose 111) support this view.

Cited by 2 publications

References 7 publications

Crystalline structure analysis of all-cellulose nanocomposite films based on corn and wheat straws

Crystalline structure analysis of all-cellulose nanocomposite films based on corn and wheat straws

The correlation between X‐ray orientation parameters and strength of fibers in native cotton

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