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Ionic Exchange and Fibre Contraction

Naturevolume 162page225 (1948) | Download Citation



IN a communication under the above title, published in Nature of May 31, 1947, p. 746, J. L. Mongar and A. Wassermann report some experiments on the de-swelling of calcium alginate fibres in salt solutions. They noted that water-swollen alginate fibres when placed in various alkali-salt solutions first contract and then increase in length. The authors suggest that the contraction results from destruction of calcium ion cross-links between alginate chains as the calcium is replaced by alkali ions. They propose also that plastic flow is mainly responsible for the final swelling effect.

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  1. 1

    Flory and Rehner, J. Chem. Phys., 11, 521 (1943); Flory, Chem. Rev., 35, 51 (1944).

  2. 2

    Hermans, J. J., Trans. Farad. Soc., 43, 91, pt. 8–9 (Aug.–Sept. 1947).

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  1. Chemical Department, Experimental Station, E. I. du Pont de Nemours and Co., Wilmington, Delaware

    •  & A. A. JOHNSON


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