Summary
A three-dimensional network containing oriented filaments of polyacrylic acid can be obtained by heating mechanically stressed foils of this substance, containing some glycerol and some sulfuric acid.
Those filaments, if suspended in water, swell anisotropically. They contract and dilate reversibly upon alternating addition of small amounts of acid and alkali to the medium in which they are suspended.
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References
W. Kuhn, O. Künzle undA. Katchalsky, Bull. Soc. Chim. Belg.57, 421 (1948).
W. Kuhn, O. Künzle undA. Katchalsky, Helv. chim. acta31, 1994 (1948). Siehe auch:J. J. Hermans undJ. Th. G. Overbeek, Bull. Soc. Chim. Belg.57, 154 (1948).
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Kuhn, W. Reversible Dehnung und Kontraktion bei Änderung der Ionisation eines Netzwerks polyvalenter Fadenmolekülionen. Experientia 5, 318–319 (1949). https://doi.org/10.1007/BF02172635
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DOI: https://doi.org/10.1007/BF02172635