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  • Chemistry  (26)
  • Electronics and Electrical Engineering  (8)
  • Computer Systems  (4)
  • 2010-2014  (12)
  • 1990-1994  (19)
  • 1975-1979  (5)
  • 1925-1929  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Synthesis and evaluation of a polyimide containing carbazole and naphthalene moiety (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 3795-3800 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1990.080281322
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  • 2
    Digitale Medien
    Digitale Medien
    Chemiluminescenz bei der Oxydation von fluorescierenden und nicht fluorescierenden Stoffen durch Wasserstoffperoxyd und Ozon (1929)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 186 (1929), S. 154-158 
    Details
    ISSN: 0863-1786
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 1. Wenn zahlreiche fluorescierende oder nicht fluorescierende Farbstofflösungen durch Wasserstoffperoxyd in Gegenwart von Ferrosulfat oxydiert werden, tritt ein Glimmen auf, das im dunklen Raume zu erkennen ist.2. Die Wellenlangen der Glimmerscheinung bei der Oxydation einiger fluorescierender Fnrbstoffe durch ozonisierten Sauerstoff sind gemessen worden.3. Kieselsaure mit etwas adsorbiertem Neutralrot zeigt in einer Suspension in Äthylallrohol bei Behandlung mit ozonisiertem Sauerstoff eine Glimmerscheinung.4. Wenn kleine Mengen eines Farbstoffes, der gutes Glimmen zeigt , rnit einem anderen Farbstoff von schwachem Glimmvermogen gemischt werden, so liefert das Gemisch bei Behandlung mit Ozon ein starkeres Glimmen als der schwächer glimmende Farbstoff allein.5. Steigerung der Temperatur führt zur Verstarkung des Glimmens bei der Oxydation von Reduktionsmitteln durch Ozon oder Wasserstoffperoxyd.6. Zunahme der Konzentration der Reduktionsmittel verursacht eine Steigerung der Glimmintensitat bis zu einem Grenewert. Wird die Konzentration weiter gesteigert, so schwacht sich das Glimmen ab und hört schließlich auf.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19291860111
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  • 3
    Digitale Medien
    Digitale Medien
    SAXS investigations on chiral liquid crystalline polymers: antiferroelectric and ferrielectric structures? (1992)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 3 (1992), S. 257-262 
    Details
    ISSN: 1042-7147
    Schlagwort(e): Chiral liquid crystalline polymers ; Antiferroelectricity ; Ferrielectricity ; SAXS ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: The structure and phase behavior of liquid crystalline polymers (LCPs) having a common chiral side chain mesogen but different main chain structures have been investigated using small-angle X-ray scattering (SAXS). While the low molecular weight chiral side chain mesogen by itself exhibits ferroelectricity, the SAXS data of the side chain LCP with a flexible polyacrylate backbone contains a bilayered superstructure peak that is indicative of antiferroelectric order. The combined LCP with a nonpolar main chain mesogen also has a bilayered superstructure, but has a different structural organization in the proposed antiferroelectric phase compared to the side chain LCP. Further changes in the phase behavior and structural organization occur when a polar group is introduced into the main chain mesogen. A ferrielectric phase has been proposed to explain the observation of a trilayered superstructure in the corresponding SAXS data. The influence of the chemical structure and connectivity on the phase behavior and superstructure formation in the chiral LCPs is discussed.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pat.1992.220030510
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  • 4
    Digitale Medien
    Digitale Medien
    Synthesis and thermal stability, dielectric, and conductivity characteristics of polymers with pendant and backbone anthracene sulfonyl groups (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 2489-2498 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Anthracene-mono- and disulfonyl derivatives of polystyrene and poly (N-vinylcarbazole) have been prepared and the thermal stability, dielectric, and conductivity of these polymer pendant sulfones have been evaluated. The anthracene-based benzene, naphthalene, anthracene, and biphenyl copolysulfones have also been prepared and characterized in regard to the above-cited properties. Interesting variations in these properties between these two classes of polymers carrying pendant and backbone sulfonyl groups have been noted and rationalised from structural considerations.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1991.070420914
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  • 5
    Digitale Medien
    Digitale Medien
    Polymer blend: A novel method for the preparation of a natural rubber-carboxylated nitrile rubber blend (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 52 (1994), S. 1007-1014 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Bis(diisopropyl)thiophosphoryl disfulfide (DIPDIS) can be successfully used to form a blend comprising polar carboxylated nitrile rubber (XNBR) and nonpolar NR through a chemical link between the two. It is revealed from the study that the physical properties of the vulcanizates obtained from the NR-XNBR blend could be significantly improved by the judicious selection of the NR:XNBR ratio. These properties can further be improved by two-stage vulcanization as described in the procedure. The SEM study reveals that it is possible to form a coherent blend of NR and XNBR in the presence of DIPDIS. © 1994 John Wiley & Sons, Inc.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1994.070520801
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  • 6
    Digitale Medien
    Digitale Medien
    Synthesis and thermal stability, dielectric and conductivity characteristics of some aromatic anhydride-modified carbazole polymers (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 1989-1995 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Copolycondensates have been prepared from carbazole, poly(N-vinylcarbazole) and various aromatic anhydrides, e.g., phthalic anhydride, trimellitic acid anhydride, pyromellitic dianhydride, naphthalene tetracarboxylic dianhydride, and benzophenone tetracarboxylic dianhydride in presence of the Friedel-Crafts catalyst anhydrous zinc chloride at high temperature. The polymers have been characterized by elemental analyses and IR spectroscopy. Thermal stabilities, dielectric, and conductivity behaviors of these polymers have also been evaluated and it has been observed that these properties show interesting differences depending upon the nature of the anhydride.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1991.070420724
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  • 7
    Digitale Medien
    Digitale Medien
    Modification of styrene-divinylbenzene copolymer by anchoring ferric-dipyridylamine complex (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 46 (1992), S. 1453-1460 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Polystyrene-divinylbenzene (PS-DVB) copolymer was modified by anchoring dipyridylamine (DPA) on it followed by complexation with Fe(III). Under the experimental conditions followed, 9% incorporation of Fe(III) was achieved. PS-DVB-DPA and PS-DVB-DPA-Fe(III) were characterized by IR spectra. Diffuse reflectance spectra for PS-DVB-DPA-Fe(III) and DPA-Fe(III) revealed λmax at ∼ 360 and ∼ 310, respectively. This difference could be due to a difference in the nature of the coordinating moieties complexing with Fe(III) in these two systems. Scanning electron micrographs of PS-DVB, PS-DVB-DPA-Fe(III), and heat-treated PS-DVB-DPA-Fe(III) revealed some typical surface features. Thermal stability varied in the order PS-DVB-DPA-Fe(III) 〉 PS-DVB-DPA ≅PS-DVB, and DTA showed characteristic exotherms. © 1992 John Wiley & Sons, Inc.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1992.070460816
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  • 8
    Digitale Medien
    Digitale Medien
    Thermal stability, morphological, dielectric, and conductivity characteristics of pyrrole modified poly-N-vinyl carbazole (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 49 (1993), S. 2189-2196 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: N-vinyl-Carbazole (NVC) has been polymerized in the presence of pyrrole (PY) by anhydrous ferric chloride. The copolymer has been characterized by IR Spectroscopy. Thermal stability of P(PY-NVC) is intermediate between that of PNVC and PPY, respectively. DSC reveals a single glass transition break at 180-200°C for P(PY-NVC), which is higher than the Tg for polypyrrole (∼ 165°C), but is lower than that for PNVC (∼ 227°C). The XRD analysis reveals PPY to be totally amorphous and shows the percent crystallinity for P(PY-NVC) to be less than that of PNVC. Dielectric constants of the polymers follow the trend: PPY 〉 P(PY-NVC) 〉 PNVC, and fall sharply with the applied frequency to a limiting value. The polymers are characterized by a broad dielectric relaxation. DC conductivity is dependent on temperature and FeCl3/polymer mole ratio and at a particular temperature follows the trend: PPY 〉 P(PY-NVC) 〉 PNVC. © 1993 John Wiley & Sons, Inc.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1993.070491215
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  • 9
    Digitale Medien
    Digitale Medien
    Chemical modification of of polypyrrole. I. Preparation and structural characterization of polypyrrole electrophically substituted with phthalic anhydride and pyromellitic dianhydride (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 54 (1994), S. 843-847 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Polypyrrole (PPY) prepared in ether and in aqueous medium has been modified by polycondensation with phthalic anhydride (PA) and pyromellitic dianhydride (PMDA) in presence of Friedel-Crafts catalysts such as anhydrous zinc chloride and anhydrous ferric chloride at high temperature. The substitution reaction between PPY and the anhydrides presumably proceeds by intra-and interchain resulting in the formation of intractable products. The characterstic carbonyl absorption band expected for C—O and diketone groups in the proposed structure for the polycondensates has been observed in spectra of the anhydride-modified poly-condensates. XRD pattern of the polycondensates is totally amorphous. © 1994 John Wiley & Sons, Inc.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1994.070540702
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  • 10
    Digitale Medien
    Digitale Medien
    Furfural-based cation-exchange resins from N-vinylcarbazole and its polymer (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 2327-2334 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Cation-exchange resins have been synthesized through the condensation of N-vinylcarbazole and poly(N-vinylcarbazole) with furfural in presence of anhydrous AlCl3 and subsequent sulfonation of the condensates. The resins have been characterized in respect to their polyfunctionality, exchange capacity, and thermal stability.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1979.070230810
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