Solubility of polymethyl methacrylate in 12 organic solvents at 30 370oC was studied.The resistance of polymers to organic solvents is theoretically and practically important. At the same time, studies in this area are mainly concerned with swelling of polymers in various media. The dissolution process itself, despite its wide application in various technologies, has been studied to a considerably lesser extent.According to the Nernst diffusion theory, the dissolution of low-molecular compounds in liquids occurs at the phase boundary rapidly and is limited by diffusion of components toward and away from the surface of a solid. The process rate v is determined by the diffusion coefficient D, boundary layer thickness l, and difference of the solute concentrations in the surface layer (c 0 ) and in the bulk (c): v = 7(c 3 c 0 ).
A solvent's molar volume is the factor that determines its ability to penetrate into a polymer structure. However, the available data for polyethylene swelling in organic solvents may be quantitatively linked with their physicochemical properties only by use of polyparameter equations, which take into account not only the molar volume of solvents but also their ability for specific and nonspecific solvation.
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