PREPARATION AND PROPERTIES OF POLY(1,4-PHENYLENEVINYLENE) DERIVATIVES

Poly(2,5-diheptyl-1,4-phenylenevinylene) (lip-PPV) was prepared by the sulfonium salt pyrolysis procedure. Due to flexible side chains, Hp-P PV was soluble in organic solvents. The molecular weights were Mn=3.8x 10(4) and Mw=1.4x10(5). The ratio of trans to cis olefinic units was f ound to be 93:7 from IH NMR spectrum. Although the peak energy was alm ost identical to that of PPV, the electrical conductivity was much low er than that of PPV. Poly(1,4-phenylene-1,3,5-hexatrienylene) (PPHT) w as also prepared. The product obtained by the Wittig reaction was an o range-red powder and its degree of polymerization was 4-9. The H-1 NMR and IR spectra indicated that the hexatrienylene units in PPHT had pr edominantly all-trans structure. PPHT could be doped with iodine and t he maximum electrical conductivity was 0.5 Scm-1.