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Reversible, discontinuous volume changes of ionized isopropylacrylamide cells

  • US 4,732,930 A
  • Filed: 05/20/1985
  • Issued: 03/22/1988
  • Est. Priority Date: 05/20/1985
  • Status: Expired due to Term
First Claim
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1. An ionic gel having a reversible phase transition function characterized by a drastic volume change in response to a change of liquid medium composition, temperature, pH or ion composition which comprises a polymerized product obtained by polymerization of isopropylacrylamide in the presence of an ion-containing monomer selected from the group consisting of a metal-containing acrylate and a metal containing methacrylate, a crosslink agent and a liquid medium selected from the groups consisting of water, a solvent compatible with water and a mixture of said solvent and water, said ion containing monomer being ion exchanged to replace said metal with hydrogen ion subsequent to said polymerization.

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