Abstract

A rapid method which compares favorably in accuracy with that of slower methods for measuring the density of cellulosic materials with a gradient column is described. Densities of several cottons before and after chemical modification by partial acetylation, carboxymethylation, aminization, and mercerization are given. Per cent acetyl can be expressed as a function of density in a linear empirical equation over a range of 13 to 42% acetyl with a precision of ± 2%. Density measurements of decrystallized, ball-mill ground, and acid hydrolyzed cottons were in agreement with the generally accepted con cept of the crystalline-amorphous cellulose phase composition in these materials. Cotton from which water was removed by solvent exchange was found to have a high density before, and a low density after, air drying.

Keywords

CelluloseCellulosic ethanolHydrolysisDensity gradientMaterials scienceChromatographySolventAcetylationPolymer chemistryChemistryAnalytical Chemistry (journal)Organic chemistryBiochemistryPhysics

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Publication Info

Year
1955
Type
article
Volume
25
Issue
7
Pages
592-600
Citations
64
Access
Closed

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Rollin S. Orr, Louis C. Weiss, Harry B. Moore et al. (1955). Density of Modified Cottons Determined with a Gradient Column. Textile Research Journal , 25 (7) , 592-600. https://doi.org/10.1177/004051755502500703

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DOI
10.1177/004051755502500703