The influence of the diluent system on the porous structure formation of copolymers based on 2-vinylpyridine and divinylbenzene-diluent system I. n-Heptane/diethylphthalate

Anion-exchange resins based on 2-vinylpyridine and divinylbenzene (DVB) wer e synthesized by suspension polymerization in presence of a diluent mixture of n-heptane (HEP) and diethylphthalate at different compositions. The DVB content used in the polymerization was also varied. The effects of the com position of the diluent mixture and crosslinking degree (DVB content) on th e porous properties of the resins were evaluated. It was found that the dev elopment of porosity was attained whenever the content of HEP in the diluen t mixture was increased for all DVB contents employed. The resins were char acterized by mercury porosimetry, BET surface area determination, apparent density, swelling in methanol and visual appearance by optical microscopy. (C) 2000 Elsevier Science Ltd. All rights reserved.