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  • Polymer and Materials Science  (248)
  • Chemical Engineering  (76)
  • ASTROPHYSICS
  • STRUCTURAL MECHANICS
  • Wiley-Blackwell  (324)
  • 1980-1984  (324)
  • 1970-1974
  • 1960-1964
  • 1983  (324)
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  • Wiley-Blackwell  (324)
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  • 1980-1984  (324)
  • 1970-1974
  • 1960-1964
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  • 1
    Electronic Resource
    Electronic Resource
    Molmassenverteilung und lösungszustand von linearen polyethylenen, 1. Lichtstreuungs-, viskositäts- und GPC-messungen (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 585-596 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Light scattering, viscosity and GPC measurements were performed on a homologous series of linear polyethylenes with viscosity average molar masses in decahydronaphthalene at 135°C between 1,0 · 105 and 2,7 · 106 g · mol-1 and relatively broad molar mass distributions. 1,2,4-Trichlorobenzene, α-chloronaphthalene, decahydronaphthalene (decalin) and decane were used as solvents. In the case of linear polyethylene in decahydronaphthalene and decane relationships between intrinsic viscosity and weight average molar mass were established. The values of the weight average molar masses obtained by light scattering are considerably higher than those obtained by viscosity and GPC measurements. These discrepancies are explained by molecular aggregation of the polyethylene macromolecules.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840313
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  • 2
    Electronic Resource
    Electronic Resource
    Molmassenverteilung und lösungszustand von linearen polyethylenen, 2Teil 1: cf. 7.. Vergleich von berechneten mit experimentell bestimmten streufunktionen (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 597-604 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Scattering functions for linear polyethylenes were calculated, using different assumptions, and compared with experimentally determined scattering functions of the system polyethylene/decane. It is pointed out, that the polyethylene macromolecules in a good solvent can be treated as statistical coils with a non-uniform expansion and a constant average expansion exponent ε and not as statistical coils with uniform expansion. Comparison of the experimentally determined and the calculated scattering functions yields a molar mass distribution of polyethylene which is in agreement with the results from GPC-measurements within the limits of experimental error.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840314
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  • 3
    Electronic Resource
    Electronic Resource
    Discrete cell model of pore-mouth poisoning of fixed-bed reactors (1983)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 29 (1983), S. 289-297 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Catalyst deactivation in an isothermal fixed-bed reactor under pore-mouth poisoning conditions is investigated theoretically using a discrete mixing cell model. Two fundamental relationships which characterize the poisoning process in the reactor are identified and incorporated into the model to develop a simple graphical procedure for a quick, general insight into the problem. This graphical method is extended to design pellet impregnation profiles along the reactor which would give nondeteriorating reactor performance up to a given time. The effects of various system parameters on the lifetime and conversion performance of the reactor are also examined analytically, graphically and numerically.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690290217
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  • 4
    Electronic Resource
    Electronic Resource
    Letters to the editor (1983)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 29 (1983), S. 876-878 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690290531
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  • 5
    Electronic Resource
    Electronic Resource
    Sequential hydration of a dry globular protein (1983)
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 255-260 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using direct difference ir and laser Raman spectroscopy, the sequential hydration of hen egg-white lysozyme was monitored. The ir data allowed us to identify some specific molecular hydration events that occur as water is added, whereas the Raman is interpreted in terms of conformational changes. The largest of these solvent-induced changes occurs below the hydration level at which activity commences.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360220135
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  • 6
    Electronic Resource
    Electronic Resource
    Chain-length-dependent microwave absorption of DNA (1983)
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 2513-2516 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360221205
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  • 7
    Electronic Resource
    Electronic Resource
    Vibration of DNA polymer in viscous solvent (1983)
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 2639-2665 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The problem of viscous damping of vibrating DNA polymer in solution is solved in the low-amplitude limit for all acoustic branches of the spectrum. The acoustic spectrum covers the microwave region of frequencies. Analytic solutions are obtained for a model describing the DNA polymer as a smooth circular cylinder. Numerical solutions are presented for a model describing the DNA polymer as a twisted cylinder of elliptical cross section. The amount of mass loading is determined for both models and the damped spectrum for the mass-loaded oscillator is calculated. The viscous damping is found to be a strong function of frequency, singular at very low frequencies for all modes except the torsional mode of the circular cylinder. All acoustic modes are overdamped, implying that the observation of well-defined resonances in DNA requires either highly structured water on the molecular level or very dry material.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360221212
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  • 8
    Electronic Resource
    Electronic Resource
    Dissociation behaviour of some mixtures of three component condensation polymers in non-aqueous media (1983)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 111 (1983), S. 203-212 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zwei Dreikomponenten-Cokondensate wurden durch Reaktion folgender Monomergruppen mit Formaldehyd hergestellt: (I) p-Chlorphenol, p-Kresol and p-Aminophenol; (II) p-Toluidin, p-Bromanilin und p-Aminobenzoesäure. Durch Zusammensetzung und Kondensationsgrad der beiden Cokondensate wurden diese charakterisiert. Die beiden Cokondensate wurden in verschiedenen stöchiometrischen Verhältnissen gemischt und die Menge an sauren und basischen Gruppen in einer bestimmten Probenmenge berechnet. Mit Hilfe der elektrometrischen Titration in nichtwäßrigen Lösungen wurden die Mengen an sauren und basischen funktionellen Gruppen in den Cokondensat-Mischungen bestimmt. Es wurde eine ausgezeichnete übereinstimmung zwischen den berechneten und den gemessenen Werten gefunden. Die Art der Titrationskurven wurde im Sinne von intramolekularer Wasserstoffbrückenbindung, Homokonjugation und Ionenassoziation in einem Medium niedriger Dielektrizitätskonstante interpretiert.
    Notes: Two three component condensation polymers have been prepared by reaction with formaldehyde from the following groups of monomeric units: (I) p-chlorophenol, p-cresol and p-aminophenol; (II) p-toluidine, p-bromoaniline and p-aminobenzoic acid. The relevant available data regarding the composition and degree of polymerization (DP) of the two copolymers have been used to characterize the samples. The two copolymers have been mixed in various stoichiometric proportions, and the amounts of acidic/basic functional groups expected to be present in a given weight of the mixture, have been calculated. Electrometric titration techniques in non-aqueous solvents have been used to determine the amount of acidic/basic functional groups present in the copolymer mixtures. An excellent correlation could be obtained between the observed and calculated values. The nature of the titration curves have been interpreted in terms of intramolecular hydrogen bonding, homoconjugation and ion-association in a medium of low dielectric constant.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1983.051110115
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and thermal stability of carborane-containing phosphazenes (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 2659-2671 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Carborane-substituted polyphosphazenes were prepared by the thermal polymerization of phenyl-carboranyl pentachlorocyclotriphosphazene. Successive isothermal vacuum pyrolyses were conducted on the polymer and examined for structural changes by infrared spectroscopy. The degradation products were ascertained by gas chromatography-mass spectrometric analysis. It was found that the presence of the carborane group improves the thermal stability of the polymer by retarding the ring-chain equilibrium processes of decomposition.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280817
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis, characterization, and study of thermal properties of methyl-substituted arylene sulfone ether polyimides, polyamides, and poly(amide-imides)Presented in part at the 27th International Symposium on Macromolecules, Strassbourg, France, July 7, 1981. (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 2069-2081 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A number of methyl-substituted bis[(phenyleneoxy) sulfone] dianilines were synthesized and reacted with pyromellitic dianhydride (PMDA), benzophenone tetracarboxylic acid dianhydride (BTDA), terephthaloyl chloride (TPC), isophthaloyl chloride (IPC), and trimellitic anhydride acid chloride (TMAC) to prepare a series of polyimides, polyamides, and poly(amide-imides), respectively. Low temperature solution and interfacial polymerization techniques were utilized to prepare the above polymers. Most of the polymers prepared formed tough, transparent flexible films. The prepared polymers were characterized by solution viscosity, thermal gravimetric analysis (dynamic and isothermal), and differential scanning calorimetry. The effect of the number and the ring substitution of methyl groups on polymer properties is discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280619
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