PREPARATION OF NOVEL MEMBRANE FROM DIANHYDRIDE-MODIFIED POLYSTYRENE WITH CONTROLLED-PORE SIZE ON MICROLEVELS AND MACROLEVELS

A technique has been developed to prepare crosslinked, porous membrane from a chemical modification of polystyrene. Polystyrene was chemical ly modified by crosslinking with pyromellitic dianhydride in nitrobenz ene using a Friedel-Crafts acylation reaction in the presence of AlCl3 at 100 degrees C. Solid-state cross polarization/magic angle spinning NMR of powdered membrane was reported. TGA of the membrane was verifi ed in air and in nitrogen. The morphologies of the membranes were anal yzed. (C) 1998 John Wiley & Sons, Inc.