Efforts are made to identify the defect structures of Poly(Pheny1ene-Vinylene) PPV converted from its sulphonium precursor by different physical and chemical methods. By X P S or FT-IR analysis, it has been shown that the carbonyl structure is the commun defect appeared in all PPV and in the initial sulphonium precursors. The ion bombardment of the sulphonium precursor leads to a PPV containing no trace of sulfur and chlorine in the structure. By contrast to the PPV obtained by pyrolysis of the precursor, the PPV obtained from the treatment of the precursor with H2SO4 or with H2S04/S03 contains no chlorine residue but much more sulfur residue. The nature of bonding between oxygen, chlorine, sulfur and the carbon atom will be discussed and the defect structures are proposed.A very thin film of plyaniline ( PANT ) doped with p-toluenesulfonic acid was prepared by electrochmical polymerization on highly ordered pplylic graphite( HOPG ) substractes. The x-ray diffraction of t h i s resulting film shows three strong diffraction at 20 = 9.97*, 26.49 and 102.48*, respectively, which are mrrespo~iding to periodic arrange of chaiti, hiterchain and mmterions[ 1-21, respectively. A highly quality STh4 image of this f i l m was observed. The average diameter of bright dots are estimated to be 3.781, which is consistent with the diameter of benzene rings. Therefore, we assign those bright dots as benzene rings. Moreover, the distance of the neighomkg bright dots along the $ diraction shown in STM hiage is calculated to be 8.6 A. This is in good agreement with value of 9.07 A measured from x-ray diffraction . So , it is reasonable to assume the; diractim shown in STM image as the diraction of PAN1 chain. If hypotheses described above are considered and a tight mtmhaine umtact shifted a quarter of the chain repeat unit are assumed, the distance between benzene rings along die diraction of the nprest tieiaiuritg interc~iain is calculated to be 6.0 A. IXS is mnsisteIit with the measured value of 6.16A, which is the distance of the neighouring bright dots along the6 diraction shown in STM image.Moreover, the angle between a and b diraction calculated based on our hypotheses is good agreement with measured value from STM image.
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