NOVEL CONJUGATED POLYMER CONTAINING ANTHRACENE BACKBONE - ADDITION POLYMERS OF 1,4-BENZENEDITHIOL WITH 9,10-DIETHYNYLANTHRACENE AND ITS CONDUCTIVITY

The addition polymerization of 1, 4-benzenedithiol to 9, 10-diethynylanthracene, which was freshly prepared before use, was carried out in a THF and benzene solution at preper temperature under nitrogen atmosphere by various initiation methods such as UV irradiation, AIBN and BPO. The yield of polymer was affected seriously by the initiation mode. Both the yield and the molecular weight are higher for the polymer prepared by UV irradiation than that prepared by means of AIBN or BPO. By UV irradiation, the yield of the polymer has reached about 60%, and the molecular weight of the polymer (Mn) obtained in THF was about 80000, which is one order higher than that of the polymer obtained in benzene. The electrical conductivity of the polymer is in the order of 10−13 S cm−1 without doping, but increased up to 10−6 S cm−1 on I2 doping. The diffuse refiectance spectra of the polymer indicate that the polymer has relatively lower band gap (about 1.77 eV), and at 1.46 eV and 0.86 eV small peaks appear, which may concern with a polaron or bipolaron in the polymer backbone. © 1990 The Society of Polymer Science, Japan.