INVESTIGATION OF THE POROUS STRUCTURE OF POLYPARAPHENYLENE BY STANDARD POROSIMETRY

It was established by standard porosimetry that polyparaphenylene (PPP ) particles, and hence also PPP films, have a regular, highly disperse microporous and mesoporous structure. The regularity of the external structure is characterized by its crystallinity, but that of the inter nal structure is characterized by a dual dispersion with pore radii r < 2.5 nm and 80 less-than-or-equal-to r less-than-or-equal-to 200 nm. ft was found that the porosity increases substantially when the PPP sw ells in acetonitrile and that the fine-porous structure changes (opens up) irreversibly by consecutive impregnation of the PPP with acetonit rile and evaporation of the acetonitrile. The mean radii of the nonpor ous fibrils of doped and undoped PPP were determined approximately.