No abstract

Polypyrrole(PPy) soluble in chloroform and m-cresol was chemically

Synthesis of Soluble Polypyrrole of the Doped State in OrganicSolvents.-Polymerization of pyrrole by using dodecylbenzenesulfonic acid (DBSA) as dopant and (NH4)2S2O8 as oxidant affords a polypyrrole (PP) soluble in m-cresol and conditionally soluble in CHCl3, CH2Cl2, and CHCl2CHCl2 on addition of DBSA. Soluble PP shows the same spectra of FT-Raman scattering and UV-VIS light absorption as those of electrochemically polymerized PP. The intrinsic viscosity of soluble PP in m-cresol is 0. 17 dl/g. The solution of the polymer in CHCl3 is cast to a stiff film with a smooth surface and of electrical conductivity 5 S/cm. -(LEE,

Abstract— Poly(hexyl‐fluorenediylvinylene‐alt‐phenylenevinylene)(PHFPPV) has been synthesized by a Wittig reaction between a fluorene phosphonium salt and terephthalaldehyde. The alternating copolymer was thermally stable to be decomposed at 410°C and soluble in chloroform. The photoluminescence (PL) spectrum is very broad and has shoulders and a bump. The bump at 560 nm disappeared on dilution of the copolymer in chloroform. The EL spectrum is broad, but not as broad as the PL spectrum, and is significantly different from the PL spectrum. The quantum efficiency of the LED was 0.002% with aluminum as a negative electrode, and the turn‐on voltage was 20 V.