Institurte of Biochemical Physics,Russian Academy of Sciences,4 Kosygin Street,117 334 Mowcow,Russia;
Deglassifying the films of plasticized polymethyl methacrylate (PMMA) in heated water causes the spontaneous segregation of water drops of micrometer and over in radius and is accompanied by a change in the film sizes. This process is impossible in structureless hydrophobic systems and points to the structural organization of the polymer chains, which are responsible for adsorption of a certain amount of molecular water by hydrophobic PMMA. From a thermodynamic standpoint, "structural hydrophily" is of en tropic nature and is provided by the micro pore generation due to the fluctuation. The micropores are stabilized owing to the capture of water molecules. When the polymer transforms to the highly elastic state, zones of a dynamically active microporous sponge are formed in it with the moisture participation. In these zones, the fluctuation results in the formation and destruction of hydrophobic slits which ensure the appearance of the water interlayers and drops of critical size that merge into the stable water phase. A thermodynamic model of the process is considered.
Yu.A.Mikheev; Institurte of Biochemical Physics,Russian Academy of Sciences,4 Kosygin Street,117 334 Mowcow,Russia; Oxidation Communications; V.24 N.1 2001; 119-133