Pore memory of macroporous styrene-divinylbenzene copolymers

The variation of the pore structure of styrene- divinylbenzene (S-DVB) copolymer beads with the drying conditions was investigated. Macroporous S-DVB copolymer beads with various DVB contents were prepared in the presence of toluene- cyclohexanol mixtures as a diluent. It was found that the pores of 10 1 -nm radius, corresponding to the interstices between the microspheres, collapse upon drying of the copolymers from toluene. The collapsed pores reexpand if the copolymers were dried from methanol. The collapse-reexpansion process of the pores was found to be revers- ible, indicating that the actual pore structure formed during the crosslinking copoly- merization is memorized by the copolymer network. The magnitude of the pore struc- ture variation increased on worsening the polymer- diluent interactions during the gel formation process due to the simultaneous increase in crosslink density distribution. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 1055-1062, 1999

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