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  • 1
    Electronic Resource
    Electronic Resource
    Eigenschaften von Polypropylen-Kautschuk-CompoundsVortrag anläßlich der gemeinsamen Tagung der Fachgruppe „Makromolekulare Chemie“ der Gesellschaft Deutscher Chemiker und des Fachausschusses „Physik der Hoch-polymeren“ der Deutschen Physikalischen Gesellschaft über „,Mehrphasige Polymersysteme“ in Bad Nauheim am 30. März 1976. (1977)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 60 (1977), S. 87-110 
    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: Compounds of propylene-homopolymers with SBS-, EPM- and EPDM-rubber are principally qualified to improve impact resistance esp. at low temperatures.The relationship between the improvement of impact properties and deterioration of tensile-, flexural- and torsional strength in this case is worse than for propylene-block-copolymers. The advantage of compounds is given by the simple possibility to improve the impact resistance as wanted. It has been shown by light- and electron-optical investigations that by compoundation a new phase is formed with particle sizes of 5 μm diameter.
    Notes: Die Compoundierung von Propylen-Homopolymerisat mit SBS-, EPM- und EPDM- Kautschuk ist grundsätzlich geeignet, ein verbessertes Kälteschlagverhalten zu erreichen.Die Relation zwischen Verbesserung der Schlagzähigkeitswerte und der Verschlechterung des Spannungsverformungsverhaltens ist dabei ungünstiger als bei einem Propylen-Block-Copolymerisat. Der Vorteil der Compounds liegt in der einfachen Möglichkeit, das Schlagverhalten von Polypropylen praktisch beliebig zu gestalten.Licht- und elektronenoptische Untersuchungen zeigen, daß durch Compoundierung mit Kautschuk eine neue Phase entsteht mit Teilchendurchmessern bis zu 5 μm.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1977.050600104
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  • 2
    Electronic Resource
    Electronic Resource
    Zeitabhängiger viskositätsrückgang bei polybutadien-cyclohexanon-lösungen (1975)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 48 (1975), S. 67-95 
    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: The viscosity of solutions of polybutadiene, polymerized by n-butyllithium, with molecular weights between 22000 and 660000 in cyclohexanone, is surprisingly found dependent on the age of solutions. According to solutions in toluene and THF the dependence of concentration from ηsp/C is found in the same way for fresh solutions in cyclohexanone. With increasing age of solutions in cyclohexanone considerable decreasing of viscosity is observed. There is found at 20°C that ηsp/C is independent of concentration after 35 days and that the Staudinger index [η] does no more depend on molecular weight after 300 days. Decreasing of viscosity approaches the limiting value after about 600 days at [η] = 13 cm3/g. Viscosity and solubility in toluene of polybutadiene treated for a short period with a ketone are far extending reduced. The relationship [η] = K·Ma, investigated at solutions of polybutadiene in toluene, THF and cyclohexanone has a common point of intersection, corresponding approximately to Staudinger index and molecular weight of the ultrasonic degradation product, resp. with molecular weight of the so-called tertiary units of not degraded polymer evaluated by means of electron microscopy methods.By the aid of Einstein's relationship of viscosity and the model of pearlstring molecules, decreasing of viscosity with time may be interpreted as a consequence of alteration in the shape of macromolecules as a result of interaction with solvent environment. It can be assumed that stretched pearlstring molecules are being formed to a heap of collapsed coil containing with solvent surrounded tertiary structures. Overthat there are reasons to suppose additionally a partial degradation of solvation layer around tertiary structure.
    Notes: An Lösungen von n-BuLi-polymerisierten Polybutadienen mit Molekulargewichten zwischen 22000 und 660000 in Cyclohexanon wurde eine in der Literatur bisher nicht beschriebene Abhängigkeit der Viskosität vom Alter der Lösungen entdeckt. Während ungealterte Cyclohexanonlösungen eine mit Toluol-und THF-Lösungen übereinstimmende Konzentrationsabhängigkeit von ηspez/C aufweisen, wird mit zunehmendem Alter von Cyclohexanonlösungen ein Rückgang der Viskosität beobachtet, der  -  untersucht bei 20°C  -  nach 35 Tagen zu Konzentrationsunabhängigkeit von ηspez/C und nach 300 Tagen zu einem vom Molekulargewicht unabhängigen Staudingerindex [η] führt. Der Viskositätsrückgang endet nach ca. 600 Tagen asymptotisch bei [η] = 13 cm3/g. Kurzzeitig mit Keton behandeltes Polybutadien löst sich in Toluol nur noch extrem langsam unter gänzlich veränderten Viskositätsverhältnissen. Die für Lösungen von Polybutadien in Toluol, THF und Cyclohexanon gefundenen Beziehungen [η] = K·Ma besitzen einen gemeinsamen Schnittpunkt, dessen Koordinaten näherungsweise mit dem Staudingerindex und dem Molekulargewicht des Ultraschall-Abbauprodukts bzw. dem elektronenoptisch ermittelten Molekulargewicht der Tertiäreinheiten des unbeschallten Polymeren übereinstimmen.Auf der Grundlage von Einsteinscher Viskositätsbeziehung und Perlschnurmolekül-Modell wird der zeitabhängige Viskositätsrückgang als die Folge zweier sich überlagernder Veränderungen des solvatzustands diskutiert: Knäuelung der Perlschnurmoleküle zu einer dichten Kugelpackung der solvatisierten Tertiäreinheiten und partieller Abbau der Solvathülle der Tertiäreinheiten.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1975.050480106
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  • 3
    Electronic Resource
    Electronic Resource
    Landolt-Börnstein: Zahlenwerte und Funktionen aus Physik, Chemie und Astronomie, Geophysik und Technik, IV. Band: Technik, 4. Teil: Wärmetechnik, Bandteil c: Gleichgewicht der Absorption von Gasen in Flüssigkeiten, Teil c 1 : Absorption von Flüssigkeiten mit niedrigem Dampfdruck. Herausgegeben von H. Borcbers, H. Hausen, K.-H. Hellwege und K. Schäfer, bearbeitet von A. kruis. Springer-Verlag, Berlin-Heidelberg-New York 1976. 6. Aufl., VII, 479 S., 350 Abb., zahlr. Tab., Ln., DM 390,- (1977)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 49 (1977), S. 922-922 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330491117
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  • 4
    Electronic Resource
    Electronic Resource
    The structure of α-(1,2-dithiole-3-ylidene) ketones and α-(1,2-dithiole-3-ylidene) aldehydes studied by means of n.m.r. spectroscopy (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 9 (1977), S. 546-552 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1H and 13C n.m.r. studies of a series of twelve 1,2-dithiole-3-ylidene ketones and aldehydes have shown that the geometry of the carbon backbone is the same as found in 1,6,6aλ4-trithiapentalenes. No evidence has been found which favours a bicyclic structure for the system. A linear correlation of observed 13C chemical shifts with calculated charge densities is found to be valid. The observations are in agreement with a structure which is a hybrid between a true ketonic structure and a true mesoionic structure.By using the difference in the 13C chemical shifts of ortho and meta carbon atoms in substituent phenyl groups it is possible to qualify the degree of coplanarity of the phenyl groups with the backbone of the molecule.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270090912
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  • 5
    Electronic Resource
    Electronic Resource
    Accuracy of X-ray fluorescence spectrometric determination of Rb and Sr concentrations in rock samples (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 6 (1977), S. 117-122 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: It is shown that application of the Compton scattering method for matrix correction in the X-ray fluorescence spectrometric determination of the trace elements Rb and Sr in rock samples can provide concentrations at a relative accuracy level of 1%. The empirical method applies to rock samples showing differences in mass absorption up to a factor of two. The accuracy of the method has been tested by analysis of 57 samples analysed for Rb and Sr by mass spectrometric isotope dilution. In addition a few of the U.S. Geological Survey (U.S.G.S.) reference rock powders, showing significantly different mass absorption, were analysed for Rb and Sr. It is demonstrated that the mica effect, if significant, is smaller than 1% relative. There is no advantage in the use of the LiF(220) analysing crystal as a substitute for the LiF(200). The method appears to be insensitive to the pellet thickness.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300060304
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  • 6
    Electronic Resource
    Electronic Resource
    Fluoraustauschreaktionen an Metalltrifluorphosphin-Komplexen. IX. Zum Reaktionsverhalten von Tetrakis(trifluorphosphin)nickel(0) gegenüber Alkyl(trimethylsilyl)aminen und -amiden (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 412 (1975), S. 239-245 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fluorine Exchange in Trifluorophosphine Metal Complexes. IX1. (Reactions of Tetrakis(trifluorophosphine)nickel(0) with Alkyl(trimethylsilyl)amines and Amides2)Alkylaminodifluorophosphine complexes Ni(PF3)4-n(PF2NHR)n (n = 1, 2, 3) 8-11 and Me3SiF are obtained, if alkyl(trimethylsilyl)amines NHR(SiMe3) (R=CH3 and n-C4H9) are reacted with Ni(PF3)4 (1). The mechanism of these peripheric reactions is discussed by assuming a four centered type intermediate. However reactions of 1 with the lithium amides LiNR(SiMe3) (R = CH3, C2H5, n-C4H9, and C6H5) yield LiF and the difluorotrimethylsilylaminophosphine complexes Ni(PF3)4-n[PF2NR(SiMe3)]n (n = 1, 3, 4) 12-18.
    Notes: Ni(PF3)4 (1) reagiert mit Alkyl(trimethylsilyl)aminen NHR(SiMe3) (R=CH3 und n-C4H9) unter Me3SiF-Abspaltung zu den Alkylaminodifluorphosphinkomplexen Ni(PF3)4-n(PF2NHR)n (n = 1, 2 und 3) 8-11. Der Reaktionsablauf wird anhand eines Vierzentren-Synchron-Mechanismus diskutiert. Hingegen liefern die Lithiumamide LiNR(SiMe3) (R=CH3, C2H5, n-C4H9 und C6H5) mit 1 unter LiF-Abspaltung die Organyl(trimethylsilyl)-aminodifluorphosphinkomplexe Ni(PF3)4-n[PF2NR(SiMe3)]n (n = 1, 3 und 4) 12-18.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19754120307
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  • 7
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Phosphors. 5958. Mitt.: M. Baudler u. M. Bock, Angew. Chem. 86, 124 (1974).. Zur Synthese und Struktur von (C6H5PS)3 (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 413 (1975), S. 239-251 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Phosphorus. 59. Synthesis and Structure of (C6H5PS)31,2,4-Triphenyl-1-thio-cyclo-3,5-dithia-1,2,4-triphosphane (C6H5PS)3 (1) is obtained in very good yield by the reaction of dipotassium triphenyltriphosphide (4) with dichloro trisulfane, as well as by the reaction of phenylphosphine with sulphur dichloride. Besides, 1 is formed, together with the cyclothiaphosphane (C6H5P)4 (3), by the reaction of a 1,2-diphenyl-1,2-dihalogen-diphosphane with hydrogen sulphide or disulfane and by the reaction of 4 and disulphur dichloride. - All of the spectroscopic data, especially the 31P nmr spectra, indicate unambiguously the heterocyclophosphane structure V with a five-membered P3S2-ring with isolated sulphur atoms, and with one of the directly connected phosphorus atoms bearing another sulphur atom in exo-position, in addition to the phenyl group.
    Notes: 1,2,4-Triphenyl-1-thio-cyclo-3,5-dithia-1,2,4-triphosphan (C6H5PS)3 (1) wird durch Reaktion von Dikalium-triphenyl-triphosphid (4) mit Dichlortrisulfan sowie durch Umsetzung von Phenylphosphin mit Schwefeldichlorid in sehr guter Ausbeute erhalten. Außerdem bildet sich 1 - zusammen mit dem Cyclo-thia-phosphan (C6H5P)4 (3) - bei der Umsetzung von 1,2-Diphenyl-1,2-dihalogen-diphosphanen mit Schwefelwasserstoff oder Disulfan sowie aus 4 und Dischwefeldichlorid. - Die Gesamtheit der spektroskopischen Befunde, insbesondere das 31P-Kernresonanzspektrum, ergibt für 1 eindeutig die Heterocyclophosphan-Struktur V mit fünfgliedrigem P3S2-Ring, in dem die S-Atome isoliert stehen und eines der direkt miteinander verbundenen P-Atome außer der Phenylgruppe noch ein exoständiges S-Atom trägt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19754130304
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  • 8
    Electronic Resource
    Electronic Resource
    Einschiebung einer Äthoxycarbonylmethylen-Gruppierung in eine Ni—N-Bindung von meso-Tetraphenylporphinatonickel(II) (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 545-546 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19750871510
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  • 9
    Electronic Resource
    Electronic Resource
    Ionization and dissociation of C6F6 isomers under electron impact (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1977), S. 297-301 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of hexafluorobenzene, hexafluorobicyclo[2.2.0]hexa-2,5-diene (perfluoro-Dewar benzene) and 1,1,1,6,6,6-hexafluorohexa-2,4-diyne, and the fragmentation mechanisms of their parent ions are reported. The behaviour of the two cyclic isomers under electron impact is very similar; the linear one behaves quite differently. The ionization potentials of the molecules and the appearance potentials of the fragment ions (both normal and metastable) have been measured. The heats of formation of [C6F5]+ and [C5F3]+ are calculated. A value for the heat of formation of 1,1,1,6,6,6-hexafluorohexa-2,4-diyne is proposed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210120509
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  • 10
    Electronic Resource
    Electronic Resource
    A gas phase study of the ions and [C3H3]- generated from the reaction of with propyne (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1977), S. 330-333 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It is reported that ions gererated in the gas phase by dissociative electron attachment to nitrous oxide react with propyne-d3 (trideuteromethyl acetylene) to yield the ions ĊD=C=CH, ĊD2—C≡C-, -CD2C≡CH and CD3C≡C-. From their differing reactivity with methyl formate it is suggested that these four ions are distinct stable species.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210120515
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