Based on a previous work the polymerization mechanism of anthracene was studied and it was found that the initial reaction step is represented by the formation of a radical ion.Poly(9,lO-anthrylene) was prepared in order to study the relevant properties with respect to its technological applicability. Pure poly(9,lO-anthry1ene)s even of relatively low molecular weight (about 3000) are infusable and nearly insoluble. Poly(9,lO-anthry1ene)s show good photoconduction. *) Postadresie: t)sterreichisches Kunststoffinstitut, Obj. 213, Franz Grill-Str. 5, Arsenal, 1030 Wien.'