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  • 1
    Digitale Medien
    Digitale Medien
    Preparation of poly(p-phenylene) via a new precursor route (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 2607-2611 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00062a032
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  • 2
    Digitale Medien
    Digitale Medien
    Carbon film from polyphenylene prepared by electrochemical polymerization (1989)
    Springer
    Journal of materials science 24 (1989), S. 3113-3117 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A carbon film was produced from polyphenylene (PP) film prepared by electrochemical polymerization of benzene to obtain a uniform and thin film. The PP film (∼10μm thick) was transformed into the carbon or graphite film without drastic changes of shape or size. The electrical conductivity of the film was remarkably enhanced by heat-treatment between 600 and 800° C, but further increase in the conductivity was not observed by treating at higher temperatures. This behaviour is considered to correlate with a poor degree of graphitization of the PP film. The carbonization and graphitization mechanisms of the film are discussed in connection with the structure of polyphenylene in the film.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01139028
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  • 3
    Digitale Medien
    Digitale Medien
    Comparative study on poly(3-alkylpyrroles) (1991)
    Springer
    Journal of materials science 26 (1991), S. 5637-5643 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Polypyrrole(PPY), poly(3-methylpyrrole)(PMPY) and poly(3-octylpyrrole) (POCPY) were prepared under the same electrochemical polymerization conditions and their properties were comparatively studied. Electrical conductivity increased in the order POCPY 〈 PMPY 〈 PPY. Absorption spectra measuredin situ showed that while peak energy of the interband transition increased in the order PPY 〈 PMPY 〈 POCPY, the absorption edge of PPY was located at almost equal energy as that of PMPY and POCPY. Stability, indicated by decrease in the ratio of conductivities after storage to the initial conductivity, was primarily dependent on the length of alkyl chains, secondly on dopants and associated with spectral deterioration. While the initial conductivity was strongly dependent on temperature and current density during electrochemical polymerization, the stability was virtually independent of these conditions. The stability increased in the order: POCPY 〈 PMPY 〈 PPY. Spectral change during storage in air was dependent on the chemical structure of polymers but almost independent of dopants. The spectral change indicated PPY to be in nearly initial states after 10 days and POCPY to be in almost completely undoped states after 200 days. In cyclic voltammograms, PPY and POCPY showed one anodic peak and PMPY two anodic peaks. Their peak potentials were associated with conjugation length.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02403968
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  • 4
    Digitale Medien
    Digitale Medien
    Comparative study on poly(3-alkylpyrroles) (1991)
    Springer
    Journal of materials science 26 (1991), S. 5637-5643 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Polypyrrole(PPY), poly(3-methylpyrrole)(PMPY) and poly(3-octylpyrrole) (POCPY) were prepared under the same electrochemical polymerization conditions and their properties were comparatively studied. Electrical conductivity increased in the order POCPY 〈 PMPY 〈 PPY. Absorption spectra measuredin situ showed that while peak energy of the interband transition increased in the order PPY 〈 PMPY 〈 POCPY, the absorption edge of PPY was located at almost equal energy as that of PMPY and POCPY. Stability, indicated by decrease in the ratio of conductivities after storage to the initial conductivity, was primarily dependent on the length of alkyl chains, secondly on dopants and associated with spectral deterioration. While the initial conductivity was strongly dependent on temperature and current density during electrochemical polymerization, the stability was virtually independent of these conditions. The stability increased in the order: POCPY 〈 PMPY 〈 PPY. Spectral change during storage in air was dependent on the chemical structure of polymers but almost independent of dopants. The spectral change indicated PPY to be in nearly initial states after 10 days and POCPY to be in almost completely undoped states after 200 days. In cyclic voltammograms, PPY and POCPY showed one anodic peak and PMPY two anodic peaks. Their peak potentials were associated with conjugation length.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00553669
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  • 5
    Digitale Medien
    Digitale Medien
    Antibacterial activity of copolymers of trialkyl(4-vinylbenzyl)ammonium chlorides with acrylonitrile (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 204 (1993), S. 119-125 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Die antibakterielle Wirkung von Homopolymeren von Cetyldimethyl(4-vinylbenzyl)ammoniumchlorid (VB16), Lauryldimethyl(4-vinylbenzyl) ammoniumchlorid (VB12) und TRimethyl(4-vinylbenzyl)ammoniumchlorid (VB1) und deren Copolymeren mit Acrylnitril wurde untersucht. Alle Homo- und Copolymeren wirkten bei den getesteten Bakterienarten-B. subtilis, S. aureus, E. coli und P. aeruginosa - keimtötend. Besondrs stake Effekte zeigten sich bei gram-positiven B.-subtilis- und S.-aureus-Kulturen. Die keimtötende Wirkung nahim in der Reihe VB16 〉 VB12 ≫ VB1 ab.
    Notizen: Homopolymers of cetyldimethyl(4-vinylbenzyl)ammonium chloride (VB16), lauryl-dimethyl(4-vinylbenzyl)ammonium chloride (VB12), and trimethyl (4-vinylbenzyl)ammonium chloride (VB1), and copolymers of these compounds with acrylonitrile were examined for antibacterial activity using B. subtilis, S. aureus, E. coli, and P. aeruginosa. All homopolymers and copolymers showed germicidal action to the bacterias, especially strong action to gram-positive B. subtilis and S. aureus. The strength of the germicidal action of the quaternary ammonium branches was in the order: VB16 〉 VB12 ≫ VB1.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1993.052040111
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  • 6
    Digitale Medien
    Digitale Medien
    Polymers with pendant groups containing an ethylenediaminetetraacetic acid moiety (1979)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 180 (1979), S. 2499-2502 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1979.021801024
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  • 7
    Digitale Medien
    Digitale Medien
    Electrochemical preparation of poly(di(2-thienyl)benzene)s and poly(4,4′-di(2-thienyl)biphenyl) (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 1755-1763 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: 1,3-Di(2-thienyl)benzene (T13B), 4,4′-di(2-thienyl)biphenyl (TBP), and 3,5-di(2-thienyl)-pyridine (T35P) were prepared. Films were deposited on the electrode in the anodic oxidative polymerization of T13B, 1,4-di(2-thienyl)benzene (T14B) and TBP, but the oxidation product of T35P did not cover the entire surface of the electrode. The infrared spectra of the films indicated oxidative coupling to occur at the 5 and 5′ positions of the thiophene rings. While the cyclic voltammograms of poly-T14B were well-defined, those of poly-T13B and poly-TBP had complex shapes with two or three anodic peaks. When the absorption spectra were measured during electrochemical oxidation, new peaks appeared at 2,0 and 1,9 eV for poly-T13B and poly-TBP, respectively. The films looked green in the oxidized state and faintly yellow in the neutral state. The green colour was retained without applied voltage in the cell and in the dry state. It was concluded that conjugation along the main chain is insufficient in these polymers.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1988.021890802
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  • 8
    Digitale Medien
    Digitale Medien
    Photopolymerization sensitized by metal acetylacetonate (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 167 (1973), S. 129-137 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Die Photopolymerisation von Styrol und Methylmethacrylat mit 12 Metall-β-diketonaten wurde untersucht. Mn(acac)3 und Co(acac)3 üben einen großen Sensibilisierungseffekt aus. Bei der Photopolymerisation von Styrol und Co(acac)3 ist die Umsatz-Zeit-Kurve bis 10% linear. Da die Sensibilisierung im Wellenlängenbereich der Charge-Transfer-Absorption hoch und im Ligandenfeldbereich niedrig ist, wird eine Photoreduktion von Co(III) zu Co(II) zur Bildung der initiierenden Radikale vorgeschlagen.Bei Anwendung von Mn(acac)3 war die Photopolymerisationsgeschwindigkeit des Styrols sehr hoch. Bei 1-Methylstyrol als Radikalfänger wurde die Reduktion von Mn(III) zu Mn(II) durch ESR bestimmt. Ohne Radikalfänger jedoch wird Mn(III) in benzolischer Lösung nicht reduziert. Sowohl bei Co(acac)3 als auch bei Mn(acac)3 geht die Initiierung vom Acetylacetonylradikal aus, das vom Chelat dissoziierte. Gleichzeitig wird das Zentralmetallion reduziert. Der Initiierungsprozeß ist der gleiche wie bei der thermischen Initiierung.
    Notizen: Photopolymerization of styrene and methyl methacrylate has been examined for twelve metal β-diketonates. Mn(acac)3 and Co(acac)3 have a large sensitizing effect. In the photopolymerization of styrene sensitized by Co(acac)3, conversion increases linearly with time up to 10% conversion. Since sensitization is high in the wavelength region of charge transfer absorption and low in ligand field region, photoreduction of Co(III) to Co(II) is suggested during the formation of initiating radical.With the use of Mn(acac)3, photopolymerization rate of styrene was very high. The reduction of Mn(III) to Mn(II) was ascertained by ESR if 1-methylstyrene was added as a radical scavenger. Without any radical scavenger, however, Mn(III) did not undergo reduction in benzene solution. In both cases of Co(acac)3 and Mn(acac)3, the initiation is by acetylacetonyl radical dissociated from the chelate. The central metal ion is simultaneously reduced. The initiation process is exactly the same as the thermal initiation.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1973.021670107
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  • 9
    Digitale Medien
    Digitale Medien
    Preparation and properties of poly(p-phenylene) and polynaphthylene (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 2241-2249 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Poly(p-phenylene), poly(2,6-naphthylene), poly(2,7-naphthylene), poly(1,5-naphthylene), and poly(1,4-naphthylene) were prepared by nickel-catalyzed polycondensation of Grignard reagents from the corresponding dibromides. The polymers were annealed in vacuo. Doping with SbF5 markedly increase the conductivity of the polymers. Annealed poly(2,6-naphthylene) is the most conductive among the four isomers after SbF5 doping. The conductivity of doped poly(2,6-naphthylene) and poly(p-phenylene) is about 10-1 S · cm-1. Annealed poly(p-phenylene) shows a broad single line ESR signal which changes to a narrow single line upon doping. Superposition of the two signals is observed at the initial stage of doping. Simultaneous conductivity and ESR measurements indicate that the narrow signal is closely related to conductivity.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1983.021841106
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  • 10
    Digitale Medien
    Digitale Medien
    Polymerization of β-propiolactone by metal acetylacetonates and carboxylates (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 2285-2291 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Einige Metallacetylacetonate und -carboxylate erweisen sich als wirksam für die Polymerisation von β-Propiolacton (2). Die Aktivität hängt vom Metallion ab. Heterochelate, die 2,2′-Dipyridyl oder 1,10-Phenanthrolin und Acetylaceton als Liganden enthalten, zeigen einen starken Effekt aufgrund der tertiären Amingruppen. Titanocendichlorid ist ein wirksamer Aktivator für diese Polymerisationen. Die Kombination von Titanocendichlorid mit Metallacetylacetonaten zeigt eine Aktivität für die Polymerisation von 2-Chloräthylvinyläther, die keine der beiden Komponenten getrennt aufweist.
    Notizen: Some metal acetylacetonates and carboxylates are effective for the polymerization of β-propiolactone (2). The activity depends on the metallic ion. Heterochelates containing 2,2′-dipyridyl or 1,10-phenanthroline and acetylacetone as ligands have a large effect due to the tertiary amine groups. Titanocene dichloride is an effective promoter for these polymerizations. The combination of titanocene dichloride and metal acetylacetonates has an activity for the polymerization of 2-chloroethyl vinyl ether, which neither component has separately.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1974.021750805
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