syneresis in polymers, in solvent extraction
Spontaneous shrinking of a gel with exudation of liquid.
Bond formation or attraction between particles or network chains within a gel induces the contraction and thereby the exudation of liquid from the network.
PAC, 2007, 79, 1801 (Definitions of terms relating to the structure and processing of sols, gels, networks, and inorganic-organic hybrid materials (IUPAC Recommendations 2007)) on page 1826