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Influence of the Porogenic Solvent

Since the ability of the porogen or a porogen mixture to dissolve a certain polymer system can usually hardly be estimated without experimentation, the effect of porogens on the overall porosity of monolithic materials is widely empirical. [Pg.18]

The fact that adding a better solvent to the mixture results in a shift of the distribution to smaller pore sizes has been explained by the mechanism of pore formation, postulated for macroporous resins in the late 1960s [101-103]. The addition of a poor solvent causes the phase separation to occur early, whereas the precipitated polymer nuclei are swollen with monomers, which present a better solvating agent than the porogen. Due to the high monomer concentration within the globuli. [Pg.18]


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