COMPARISON OF FORMATION SITE OF GRAFT CHAIN BETWEEN NONPOROUS AND POROUS FILMS PREPARED BY RIGP

An epoxy-group-containing vinyl monomer, glycidyl methacrylate (GMA), was grafted onto nonporous and porous polyethylene films which were pr eviously irradiated with an electron beam at a total dose of 200 kGy. The epoxy groups on the poly-GMA chain were ring-opened for the introd uction of an iminodiacetate (IDA) group which is capable of transporti ng protons and chelating metal ions. The formation site of the graft c hain can be clarified by comparing the surface and volume resistivitie s of the resultant IDA-group-containing film (IDA film). A constant vo lume resistivity of nonporous IDA film irrespective of the degree of G MA grafting (dg) indicated that the central part of the film remained ungrafted. However, both volume and surface resistivities of porous ID A film decreased with increasing dg, indicating that the poly-GMA chai ns penetrated the porous film thoroughly. The distribution of the IDA group across the IDA film was also verified by XMA determination of co pper ions adsorbed onto the film.