A Novel type of ion extraction meterial using host-guest properties of polybenzoxazine local structure

Abstract

Calixarene, cyclodextrin or crown ether are well known to form inclusion compounds with various guest molecules. The development of inclusion compound as an ion extraction material has received much attention as a mean to improve efficient industrial applications. Recently, Ishida et al. proposed the preparation of a novel type phenolic resins, the polybenzoxazines and the applications for composite materials. However, it is expected that polybenzoxazines show the interaction between metal ions due to their specific structures as known in the case of ordinary phenolic materials. The present work explores polybenzoxazine as an inclusion compound by investigating the ion interaction among various metal cations. It is found that the ion extraction phenomena in liquid / liquid phase system is controlled by the concentration of polybenzoxazine, the type of the organic phase and the type of metal ions. It can be concluded that the polybenzoxazine can be expected for a use as a novel type of ion separation material, owing to the host-guest specific properties.