Ion-Exchange Property of Polycondensed Fused-polynuclear Aromatic(COPNA) Resin from the Mixt u re of Pyrene and Phenanthrene as a Raw Aromatics

Abstract

Preparation of ion-exchange COPNA resin was carried out by sulfonation of COPNA resin with conc. sulfuric acid.
The COPNA resin, used was prepared from the mixture of pyrene and phenanthrene added 1, 4-benzenedimethanol (PXG) as a crosslinking reagent.
The optimum conditions of sulfonation was det ermined. The ion-exchange capacity of the resulting resin was measured and then the resin was examined for thermostabilities.
The highest ion-exchange capacity of ca.3.5 meq/g was given to the post-cured resin at 200°C for 1 h when the resin was ground under 105 urn and sulfonated with conc. sulfuric acid in continuously stirring at 120°C for 2 h.
Observation of resin particle surface an d its cross section shows that sulfonation proceeds from particle surface to interior side with reaction time to cause cracking like annual ring. This ion-exchange COPNA resin is outstanding in wettability and not swelled in water. Consequently, the rate of ion exchange is fast.
The resin in boiling water for 1 h decreas ed ion-exchange capacity by only 10%.