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  • Articles  (940)
  • Physics  (545)
  • Inorganic Chemistry  (395)
  • 1970-1974  (816)
  • 1935-1939  (124)
  • 1
    Electronic Resource
    Electronic Resource
    Polymorphism in nylon 12 (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 10 (1972), S. 191-192 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.160100114
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  • 2
    Electronic Resource
    Electronic Resource
    Conformations of branched poly(α-amino acids) in solution and at the air - water interface (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 10 (1972), S. 2125-2134 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The validity of Silberberg's hypothesis concerning the conformation of branched polypeptides was tested by studies on solutions and on monolayers. The poly(α-amino acids) investigated consisted of poly-L-lysine backbones with side chains of poly(gamma;-benzyl L-gutamate) and poly(β-benzyl L-aspartate). In solution, the conformation was studied in the mixed solvent chloroform-dichloroacetic acid. Optical rotatory dispersion measurements demonstrated the existence of a helix-coil transition which is a function of the length of the side chain. A significant “transition curve” appeared between 9 and 15 residues. From the results, it may be assumed that the poly-L-lysine backbone is extended in a coiled conformation and the side chains are coiled or helical, depending on the number of glutamate residues. At the air-water interface, a discontinuity in the surface-pressure curve appears between 9 and 15 residues per side chain. The similarity with the results obtained in solution appears significant; however, this has to be confirmed with methods more specific for structural modifications.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.180101102
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  • 3
    Electronic Resource
    Electronic Resource
    Metal compounds in free-radical processes. III. Polymerization of acrylonitrile initiated by copper (II) nitrate in presence or absence of triphenylphosphineFor Part II, see Horanská and Bartoň.1 (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 2273-2282 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bulk polymerization of acrylonitrile (AN) initiated by copper (II) nitrate, Cu(II), in the absence of light has been studied. The rate of the AN polymerization may be expressed in the Cu(II) concentration range from 5 × 10-4 to 1 × 10-1 mole 1.-1 by the equation, Rp = k5[Cu(II)]0.68, where k5 = KAN[AN]/(1 + KAN[AN]). From the spectrophotometric measurements the values of 0.70 l./mole and 0.08 l, mole were obtained for the equilibrium constant at 20 and 60°C, respectively, KAN = [C]/[AN]-[Cu(II)], corresponding to the formation of the complex C from acrylonitrile and copper (II) nitrate. An addition of triphenylphosphine (C6H5)3P into the polymerization system reduces Rp, and no polymerization takes place at all provided [(C6H5)3P]/[Cu-(II)] ≧ 5. The retardation effect of (C6H5)3P on the polymerization of AN initiated by Cu(II) is attributed to a competitive reaction of Cu(II) with (C6H5)3P in which Cu(II) is reduced and the product of this reduction CuNO3·2(C6H5)3P is inactive with respect to the polymerization of AN.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170121009
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  • 4
    Electronic Resource
    Electronic Resource
    Poly α-ester degradation studies. IV. Rheological studies of polymer degradation (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 2031-2043 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Farol-Weissenberg rheogoniometer has been used to follow molecular weight changes during the degradation of certain poly-α-esters in the melt state. By observing the change in melt viscosity at low shear rates it had been shown that the decomposition of the poly(isopropylidene carboxylate) is substantially first-order with respect to the molecular weight of the residual polymer. The derived kinetic parameters are in good agreement with those previously obtained by other techniques. This provides a substantial piece of supporting evidence for the view that degradation takes place predominantly by intramolecular ester interchange involving the formation of 1,1,4,4,-tetramethylglycollide. The introduction of β-chlorine atoms into the polymer structure leads to a more complex degradation pattern. Thus the presence of a single β chlorine atom per repeat unit, as in poly(3-chloro-2-methyl-2-hydroxypropionic acid) leads to a substantially similar dependence on molecular weight with the added complication of progressive crosslinking which becomes more apparent in later stages of the reaction. This crosslinking reaction plays an increasingly important part as the extent of chlorination of the polymer is increased. In addition, the presence of chlorine leads to an increased sensitivity of the degradation reaction to the presence of oxygen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170110822
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  • 5
    Electronic Resource
    Electronic Resource
    Infrared spectra of three crystalline forms of cationically synthesized poly-3-methyl-1-butene (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 2991-2997 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly-3-methyl-1-butene has been synthesized by Et2AlCl/tBuCl initiator at -130°C. A cast film of this material gave three well defined crystalline phases, α, β, and γ, characterized by infrared spectroscopy. The γ polymorph could not be obtained independently of the other two. Synthesis and/or manipulative procedures that would consistently give only one of the polymorphs are still unavailable. Evidently, the three crystalline phases have very similar lattice energies, and the subtle factors that determine the ultimate nature of the crystal lattice are not yet understood.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170111117
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  • 6
    Electronic Resource
    Electronic Resource
    Die Divanadate des Thoriums (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 410 (1974), S. 301-312 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Divanadates of ThoriumIt is shown that ThV2O7 appears in three polymorphic forms, two of them are crystalline and the third is amorphous. The structural behaviour of these forms is analysed with the aid of thermal, x-ray, and spectroscopic methods. The infrared spectra of the three modifications are discussed in detail.
    Notes: Es wird gezeigt, daß ThV2O7 in zwei kristallinen und einer amorphen Modifikation vorkommt. Das strukturchemische Verhalten dieser Formen wird an Hand von thermischen, röntgenographischen und spektroskopischen Messungen erläutert. Die Infrarotspektren der drei Phasen werden eingehend besprochen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744100310
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchungen über die Kinetik und den Mechanismus der Bindung von Schwefeldioxid und Stickoxiden durch gasförmiges AmmoniakReferat vorgetragen während des Internationalen Symposiums des RGW „Über Verfahren zur Abscheidung von Schwefeldioxid aus Abgasen“, Halle 1973. (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 404 (1974), S. 284-294 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Kinetics and Mechanism of the Reaction of Sulphur Dioxide and Nitrogen Oxides with Gaseous AmmoniaIt was found that depending on the partial pressure of SO2, H2O, and NH3 different solid products were formed. Formation of the product containing the smallest amount of the substrate of the lowest partial pressure is favoured.The measured stability limits of the solid products confirmed the former thermodynamic calculations. The conditions for effective binding of NOx with ammonia were established.
    Notes: Es wurde festgestellt, daß in Abhängigkeit von den Partialdrucken von SO2, H2O und NH3 in der Gasphase verschiedene feste Produkte gebildet werden. Bevorzugt ist dabei Bildung des Produktes, das möglichst kleine Mengen der im Unterschuß vorhandenen Substanz enthält.Die experimentell ermittelten Grenzwerte der Stabilität fester Substanzen bestätigten die Ergebnisse früher durchgeführter thermodynamischer Berechnungen. Bedingungen, unter welchen die Stickoxide vom Ammoniak am effektivsten gebunden werden, wurden bestimmt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744040309
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  • 8
    Electronic Resource
    Electronic Resource
    Kristallchemisches Verhalten und IR-Spektren einiger Divanadate des Thortveitit-Typs und verwandter StrukturenX. Mitteilung der Reihe „Orthovanadate und verwandte Verbindungen“. IX. Mitt.: J. C. PEDREGOSA, E. J. BARAN u. P. J. AYMONINO, Z. Kristallogr., Kristallgeometr., Kristallphysik, Kristallchem., 137, 221 (1973). (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 404 (1974), S. 308-320 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Chemistry and IR Spectra of Some Divanadates of the Thortveitit Type and Related StructuresSome aspects of the crystal chemistry of divanadates of the type M2V2O7 are discussed and comparisons are made with the corresponding diphosphates. Results of the X-ray investigation (powder method) of Cu2V2O7, Mg2V2O7, Co2V2O7, Ni2V2O7 and Zn2V2O7 are also reported and commented. The infrared spectra of these compounds as well as those of Cd2V2O7 and Mn2V2O7 are recorded between 4000 and 300 cm-1 and briefly discussed. The results show that the V2O74- groups are subjected to relatively important distortions in the crystal lattices.
    Notes: Das kristallchemische Verhalten von Divanadaten des Typs M2V2O7 wird besprochen und mit demjenigen der entsprechenden Diphosphate verglichen. Ergebnisse der röntgenographischen Untersuchungen (Pulver-Methode) von Cu2V2O7, Mg2V2O7, Co2V2O7, Ni2V2O7 und Zn2V2O7 werden mitgeteilt und diskutiert. Die IR-Spektren dieser Verbindungen sowie auch diejenigen von Cd2V2O7 und Mn2V2O7 wurden im Bereich zwischen 4000 und 300 cm-1 gemessen und interpretiert. Alle Ergebnisse weisen auf das Vorhandensein von relativ starken Störungen der V2O74--Gruppen in den Kristallgittern hin.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744040312
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on kinetics and mechanism of the reaction of sulphur dioxide and nitrogen oxides with gaseous ammonia. II. Thermodynamic Equilibria in the System SO2, NH3, H2O, and CO2 (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 410 (1974), S. 213-218 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Untersuchungen über die Kinetik und den Mechanismus der Bindung von Schwefeldioxid und von Stickoxiden durch gasförmiges Ammoniak. II. Thermodynamische Gleichgewichte im System SO2, NH3, H2O und CO2Die Abhängigkeit der Gleichgewichtskonstanten der Ammoniumsulfitbildung aus SO2, NH3 und H2O von der Temperature, die mit der von Wolfkowitsch und Zirlin theoretisch abgeleiteten Gleichung berechnet wurde, konnte durch Auswertung experimenteller Daten bestätigt werden. SO2 kann im festen Ammoniumsulfit durch CO2 ersetzt werden falls der Partialdruck von CO2 mindestens 104mal größer ist als der Partialdruck von SO2.
    Notes: The temperature dependence of the equilibrium constant of the formation of ammonium sulphite from SO2, NH3, and H2O given by theoretical equation derived by Wolfkowitsch and Zirlin has been confirmed by calculations based on the accessible experimental data. Substitution of SO2 by CO2 in solid ammonium sulphite can take place when partial pressure of CO2 exceeds at least 104 times that of SO2.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744100214
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  • 10
    Electronic Resource
    Electronic Resource
    Polyamide-imides (1970)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 8 (1970), S. 683-692 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel preparation of polyamide-imides from diphenylmethane diisocyanate and trimellitic anhydride in N-methylpyrrolidone is described. Partial substitution of trimellitic anhydride with either maleopimaric acid, terephthalic acid, or by various di-anhydrides permitted a correlation of structure with solution stability and thermal properties. Heat resistance improved with increasing imide content of the polyamide-imide. Almost all solutions advanced in viscosity on storage at room temperature. The least stable solutions were those that deviated the most from 50-50 amide-imide. However, the viscosity changes depended somewhat on the type of modifying ingredient. For example, polyamide-imides modified by substitution of 10% PMDA (pyromellitic anhydride) or BPDA (benzophenone tetracarboxylic acid dianhydride) were less stable than those modified with 10% (cyclopentanetetracarboxylic acid dianhydride) CPDA or THFDA (tetrahydrofuran-2,3,4,5-tetracarboxylic acid dianhydride). The use of excess reagent and of monofunctional chain stopper was investigated as a means of controlling solution stability.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1970.150080311
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