Abstract
The effects of temperature and molecular weight on the formation of inhomogeneous polymer gels, in which chemical gelation and phase separation take place simultaneously, were investigated. Slow chemical gelation by gamma ray irradiation was suitable for systematic analysis. In starting from ordinary polymer solutions, the characteristic wavenumber of the porous structure decreases very sharply with depth of temperature jump. However, with appropriate amount of pre-dose, the effects of temperature are almost taken over by those of the pre-dose. The shape of the phase boundary also contributes to this temperature insensitive region. Hence, pre-dose of polymer solutions, which induces the molecular weight build up, is an important factor that facilitates controlled preparations of inhomogeneous porous structures of chemical gel networks.
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