 Polystyrene, P.S., dissolved in a mixture of N, N-dimethylformamide, DMF, and or tetrahydrofuran, THF, was electrospun to prepare fibers with submicron diameters. The tensile strength of the P.S. fiber film was 1.5 MPa, indicating strong reinforcement from double-strand fibers. This article was authored by Sikihuan, Guoshianglu, Guangpinghan, and others.