Abstract
A 0.2N aqueous solution of sodium alginate (molecular weight ˜ 105) was extruded into 1N hydrochloric acid, thus producing alginic acid fibres, which were converted into calcium alginate by immersion in M/10 calcium acetate. The well-washed calcium alginate threads, fully swollen with water, contained 0.37 × 10-3gm.-equiv. calcium per gm., the ratio of equivalent calcium to equivalent water-insoluble acid was 1.0, and the dry weight was about 8 percent. These fibres were opaque ; slightly elastic, birefringent and capable of heterogeneous cation exchange reactions in which a replacement of the calcium by other cations takes place.
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MONGAR, J., WASSERMANN, A. Ionic Exchange and Fibre Contraction. Nature 159, 746 (1947). https://doi.org/10.1038/159746a0
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DOI: https://doi.org/10.1038/159746a0
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