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Pore memory of macroporous styrene–divinylbenzene copolymers

✍ Scribed by Erol Erbay; Oğuz Okay

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
196 KB
Volume
71
Category
Article
ISSN
0021-8995

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✦ Synopsis

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 toluenecyclohexanol 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 reversible, indicating that the actual pore structure formed during the crosslinking copolymerization is memorized by the copolymer network. The magnitude of the pore structure variation increased on worsening the polymer-diluent interactions during the gel formation process due to the simultaneous increase in crosslink density distribution.

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