ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The small gels present in cotton linters viscose, prehydrolyzed sulfate wood pulp viscose, and sulfite wood pulp viscose were examined by light scattering, electron microscopy, and chemical methods. In all cases a population of nearly monodisperse, spherical gels was found. The diameters are 0.3-0.6 μ by light scattering techniques, while the diameters of the dry gels by electron microscopy are near 0.1 μ. The difference is attributed to the swelling of the possibly crosslinked gels. The number of these inhomogeneities is very high, of the order of magnitude of 1011 gels/g. cellulose, yet they comprise less than 0.1% of the total mass involved. Chemically, the wood pulp viscose small gels appear to be about half cellulose II of a very low degree of substitution and about half of unknown composition. The cotton linters viscose gels contain xylan and some silica. These gels bear a striking resemblance to those studied in a previous acetate gel investigation, for both the cotton linters and the wood pulps. It is speculated that they may have a common origin.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1963.070070420
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