Solvent regain

The characteristic structure of the diluent-modified SDVB copolymers is retained in their sulfonated derivatives. A comparison of the solvent regains of macroporous sulfonic acid resin, conventional sulfonic acid resin, and their parent hydrocarbon matrices is made in Table 1. The sulfonated macroporous product like its parent hydrocarbon copolymer also takes up normally incompatible solvents and the close similarity of their regains in the sulfonated material to the water regain of the hydrocarbon matrices, expressed in compatible units, shows that the macropores have largely survived the sulfonation... 

Table 1. Comparison of solvent regains of a macroporous resin with a conventional resin ...

Solvent Solvent regain of macroporous resin (ml/g) Solvent regain of conventional resin (ml/g) ... 

V0 may be easily measured by applying to the system a molecular species completely excluded from the gel system. V is the product of multiplication of the number of grams (a) of dry xerogel and the solvent regain, Wr, which is the amount of solvent taken up by one gram of dry xerogel. 

The classic Flory—Dusek—Prins approach to the sweUing of networks predicts that the solvent regain increases with the fraction p of danghng chains [128, 129] ... 

Another method frequently used for the determination of pore volume of chromatographic media is based on the solvent regain. In this method, the gel slurry is centrifuged to remove the ectra-particle liquid. The solvent regain is then determined gravimetrically after evaporation of the interparticle liquid (38). Discrepancies tietween the pore volume determined by solvent regain and Isy SEC may indicate sorption effects. In this case another solute-solvent system should be used in the chrcmatographic method. 

In his memoir on solutions Dissertatio de Actione Menstriiorum IV) Lomonosov supposed that air is present in solids, and this air, together with that contained in the solvent, regains its former elasticity and tears the solid to pieces, the particles of the dissolving body repelling one another by a vibratory motion. There is a glimmering here of the gaseous theory of solutions of van t Hoff, and a departure from the view that solutions are chemical compounds. ... 

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