Showing papers by "En-Tang Kang published in 1988"
TL;DR: In this article, the polypyrrole-chlorine (PPY-Cl2) complex is shown to have a room-temperature direct-current (d.c.) electrical conductivity that varies from <10−7 to 0.5 S cm−1 depending on the solvent medium used for polymerization.
46 citations
TL;DR: ESCA Analysis of Polymer-Acceptor Interactions in Chemically Synthesized Polypyrrole-Halogen Complexes (ESCA-HCC) as discussed by the authors.
Abstract: ESCA Analysis of Polymer–Acceptor Interactions in Chemically Synthesized Polypyrrole–Halogen Complexes
38 citations
TL;DR: X-ray photoelectron spectroscopy (XPS) studies have been performed on polypyrrole-2,3-dichloro-5,6-dicyano-p-benzoquinone (PPY-DDQ) and poly pyrrole -tetrachlorono-o-bennone ( PPY-chloranil) complexes prepared via the simultaneous chemical polymerization and oxidation of pyrrone by the respective acceptor.
Abstract: X-Ray photoelectron spectroscopy (XPS) studies have been performed on polypyrrole–2,3-dichloro-5,6-dicyano-p-benzoquinone (PPY–DDQ) and polypyrrole–tetrachloro-o-benzoquinone (PPY–chloranil) complexes prepared via the simultaneous chemical polymerization and oxidation of pyrrole by the respective acceptor. XPS data suggested that the charge transfer interactions in both complexes probably proceeded further than the pure formation of a molecular complex. The negative charges of both organic anions were mainly localized on the oxygen and the chlorine atoms and to some extent on the nitrogen of DDQ. More extensive charge transfer interaction and higher fraction of pyrrole nitrogen with positive charge were observed in the PPY–DDQ complex, which exhibited a substantially higher electrical conductivity than the corresponding PPY–chloranil complex.
36 citations
TL;DR: In this paper, X-ray photoelectron spectroscopy (XPS) has been used to evaluate the degree of oxidation of polypyrrole nitrogen atoms, showing that 34% of the total iodine present has undergone ring substitution in the polymer chain.
24 citations
TL;DR: The physicochemical properties of the polyazulene-bromine complex were characterized by elemental and thermogravimetric analyses, infrared and ultraviolet-visible absorption spectroscopy, cyclic voltammetry and gel permeation chromatography as discussed by the authors.
Abstract: Simultaneous chemical oxidation and polymerization of azulene by iodine and bromine were carried out. The polyazulene-bromine complex is electrically conductive and partially soluble in organic solvents whereas the polyazulene-iodine complex is much less conductive and insoluble. The physicochemical properties of the polyazulene-bromine complex were characterized by elemental and thermogravimetric analyses, infrared and ultraviolet-visible absorption spectroscopy, cyclic voltammetry and gel permeation chromatography. Experimental evidences suggest that the soluble fraction of the complex consists mainly of azulene oligomers.
22 citations
TL;DR: In this paper, the thermal and electrical properties of polypyrrole (PPY)-halogen complexes were studied by thermogravimetry while the electrical stability was characterized by electrical conductivity measurements at various temperatures and current loadings, as well as cyclic voltammetry.
12 citations
TL;DR: In this article, the electrochemical properties of polypyrrole-bromine (PPY-Br2) and polypryrole-iodine (I2) complexes obtained from the halogens induced chemical polymerization and oxidation of pyrrole were studied.
2 citations
Journal Article•
TL;DR: The relation entre le signal du spectre and les proprietes physiques et electroniques de complexes avec des accepteurs (I 2, Br 2 Cl 2, DDQ and chloranil) is discussed in this paper.
Abstract: Relation entre le signal du spectre et les proprietes physiques et electroniques de complexes avec des accepteurs (I 2 , Br 2 Cl 2 , DDQ et chloranil)
1 citations