A swell polymer that has three-dimensional networks, and is solidified sol (colloidal solution) in a jelly form.

A polymer gel that changes its volume by changes of ion concentration in solution, thermal fluctuations, chemical reactions, electric stimuli, or light stimuli, and so on is called the mechanochemical or chemomechanical material. These gels are the nonelectrolyte polymer gel (polyvinyl alcohol ;PVA) in which the changes of solvent composition make the polymer chains and the solvent act on each other, thermal reversible composite (methyl cellulose water solution), electrolyte gel (polyacrylonitrile) that contracts at changes of ion concentration, electrolyte gel (polyvinyl alcohol) that responds to electric stimuli, and one that responds to light stimuli (polyacrylic amide). Use of gel for micromachines, especially for artificial muscles and drug delivery system (DDS) is being studied.


[Related Terms]
Chemomechanical material