ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Characterization of the interfacial bond in paper-polypropylene-paper laminatesDedicated to the memory of Paul H. Lindenmeyer, colleague and friend. (1994)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 34 (1994), S. 285-289 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: The interfacial strength of two paper-polypropylene-paper laminates used for electrical power transmission cable insulation has been measured using a peel test after a variety of conditionings that simulate the service thermal stress conditions. Immersion in dielectric oil at 23°C causes little decrease in peel strength, but heating in the oil at 90°C causes a rapid initial loss followed by a slow loss of strength. Cyclic and static heating show that cyclic fatigue is not a factor as the initial loss of strength occurs in a time comparable to the first two test cycles and further heating causes much less loss of strength. Tensile and compressive stresses resulting from cable winding have no effect on the loss of bond strength during heating in oil. Vacuum drying of the laminate and oil (as in cable manufacture) before heating results in less decrease in peel strength than heating without prior drying. Optical and electron microscopy show minimal wetting of the paper fibrils by the polypropylene with only a few having been either normal to or at a steep angle to the polypropylene surface. That is, the fibrils appear to be parallel to the interface and only partially immersed in the polypropylene. Micrographs show little, if any, differences between the interfaces on the two sides as well as little paper on the polypropylene after delamination and vice versa. It is suggested that the bonding mechanism is a combination of weak mechanical interlocking and secondary bonds. It is also suggested that swelling of the polypropylene relative to the paper by the dielectric oil at 90°C weakens the interfacial bond.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760340409
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Polymerisation via macrozwitterions, 3Part 2: cf.2.. Ethyl and butyl cyanoacrylates polymerised by benzyldimethyl, triethyl and tribenzylamines (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 421-435 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Anionic polymerisations of ethyl and butyl cyanoacrylates (ECA and BCA) in THF, initiated by benzyldimethylamine (BDMA), triethylamine (TEA) and tribenzylamine (TBA) were studied between 50 and -78°C. Initiator utilisation was very low, and polymer molecular weights correspondingly high, though believed to be depressed by acid impurities in the monomer samples. Conversion curves reached internal 1st order kinetics, almost instantaneously when the initiator was BDMA, more slowly with TEA, and only after a long acceleration period with TBA, which gave overall rates some two orders of magnitude lower than those induced by the other amines. With BCA initiated by BDMA or TEA, the rate constants increased as reaction temperature was lowered. A general kinetic scheme is suggested, postulating no intrinsic termination reactions, and complex initiation processes, which according to the nature of amine and monomer may involve either one or two pre-initiation equilibria.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820213
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Polymerisation via macrozwitterions, 1. Ethyl and butyl cyanoacrylates polymerised by triethyl and triphenylphosphines (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 393-406 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Anionic polymerisation of ethyl and butyl cyanoacrylates in THF initiated by triethyl and triphenylphosphines were followed by adiabatic calorimetry at temperatures between 20 and -95°C. The polymers showed UV absorptions characteristic of phosphonium and cyanoacrylate carbanion end groups, indicating that the growing chains were macrozwitterions. Monomer conversion was quantitative and of 1st order in both monomer and initiator. Other criteria of ‘living’ polymerisation were satisfied, e.g. molecular weights corresponded to one chain per initiator molecule, and indicated that monomer added subsequently was incorporated on to previously formed chains. Assuming the overall rate to be that of propagation yielded values of kp = 1 - 3 · 105 dm3 · mol-1 · s-1 at -78°C, with very low activation energies, i.e. 2,2 and 5,5 kJ · mol-1 for ECA and BCA, respectively. Of a range of inert salts only LiBr significantly reduced the rate of polymerisation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820211
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Polymerisation via macrozwitterions, 2Part 1: cf.1.. Ethyl and butyl cyanoacrylates polymerised by pyridine and polyvinylpyridine (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 407-420 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Anionic polymerisations of ethyl and butyl cyanoacrylates in THF initiated by pyridine and polyvinylpyridine were studied between 42 and -95°C. The polymers showed the UV absorption of quaternised pyridine, indicating that they had grown as macrozwitterions. Pyridine consumption was very low (few %) and the polymer molecular weights high (3 · 105 - 106) irrespective of reaction conditions. Overall rates increased as reaction temperature was reduced, approaching those found in phosphine-initiated polymerisations by -78°C. At 20°C the kinetics were complex, e.g. sigmoid conversion curves which reached an internal first order, yet showing apparent 2nd order external order. A qualitative kinetic interpretation is given, postulating absence of intrinsic termination processes, and a complex initiation process involving (exothermic) equilibrium formation of a precursor betaine. Polyvinylpyridine initiates graft copolymers; but only in presence of chain-terminating agents, e.g. acids, lactones or sultones, can the grafted side chains be kept short, and their number raised towards the potentially complete grafting of all pyridine groups.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820212
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Estimation of viscosities of mixed polymer solutions (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 1281-1293 
    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 semiempirical model for estimation of viscosities of concentrated polymer solutions1 can be applied to mixtures of polymers in a common solvent. The data required for estimation of mixture viscosity are: solvent viscosity, polymer molecular weight, density, concentration, and intrinsic viscosity in the particular solvent. Calculated and experimental viscosities agree to within a few per cent for the relatively nonpolar systems for which comparative data are available. The model does not appear to be adequate for mixtures in which there are extensive hydrogen-bonding interactions.Results of the new model are equivalent to those of an empirical equation2 reported to be effective for fairly concentrated binary polymer mixtures.Specific interactions between polymeric solutes can be conveniently assessed by comparing measured mixture viscosity to that calculated from the model presented. It is not clear, however, that such assessments have any fundamental significance, since the interactions which are calculated depend on the assumptions inherent in the estimation of the “ideal” mixture viscosity. The same reservations apply to other models which have been proposed for this purpose.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070160518
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Über die Ammoniumbleihalogenide (1893)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 4 (1893), S. 117-127 
    Details
    ISSN: 0863-1778
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.18930040109
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Die Dichte fester Stoffe, mit besonderer Berücksichtigung der durch hohe Drucke hervorgerufenen dauernden Änderungen (1912)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 76 (1912), S. 274-302 
    Details
    ISSN: 0863-1778
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Mit einer neuen verbesserten Form des Pyknometers haben wir die Dichte von Salzen und anderen Substanzen mit einer Genauigkeit von 3-4 Einheiten in der vierten Dezimale, d. h. bis auf etwa 0.02% bestimmt. In vielen Fällen jedoch ist eine derartige Genauigkeit nicht notwendig, da die durch die Inhomogenität des Materiales bedingten Dichteänderungen bedeutend größer sein können.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19120760111
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Der Einfluss des Druckes auf die Schmelzpunkte einiger Metalle (1911)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 72 (1911), S. 11-30 
    Details
    ISSN: 0863-1778
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die Änderung des Schmelzpunktes von Zinn, Wismut, Blei und Cadmium mit dem Druck ist gemessen worden. Der Schmelzpunkt erwies sich als eine lineare Funktion des Druckes innerhalb der Grenzen der Experimentalfehler.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19110720103
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Mitteilungen aus dem Laboratorium für Geophysik der Carnegie Institution in Washington. 4. Die genaue Bestimmung von Schwefel in Pyrit und Markasit (1910)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 69 (1910), S. 102-121 
    Details
    ISSN: 0863-1778
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es ist gezeigt worden, dass beim Zerreiben von Eisensulfiden für die Analyse eine teilweise Oxydation unter Bildung von Schwefeldioxyd und Ferrosulfat eintritt. Wenn sie fein gepulvert werden, so ist dieser Fehler nicht zu vernachlässigen; er kann auf 0.050% verringert werden durch vorsichtiges Zerkleinern, bis das Material durch ein 8 (pro cm) Maschensieb hindurchgeht. Dies genügt für die vorgeschlagene Analysenmethode. Ungleichförmiges Material, wie man es bei technischen Analysen erhält, muß wegen der genauen Probenahme gepulvert werden. In diesem Fall kann der Fehler bestimmt werden durch Auswaschen einer gewogenen Menge des Pulvers mit siedendem Wasser in einer Kohlendioxydatmosphäre und Bestimmen des Eisens in den Waschwässern; das Verfahren ist ziemlich peinlich, weil sich die feuchten Sulfide schnell oxydieren.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19100690109
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Die mineralischen Eisensulfide (1912)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 76 (1912), S. 201-273 
    Details
    ISSN: 0863-1778
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die Darstellung von Eisendisulfid wurde ausgeführt 1. durch Einwirkung von Schwefelwasserstoff auf Ferrisalze oder von Schwefel und Schwefelwasserstoff auf Ferrosalze; 2. durch Addition von Schwefel aus Lösung an amorphes Ferrosulfid oder Pyrrhotin; 3. durch die Einwirkung löslicher Polysulfide auf Ferrosalze; 4. durch Einwirkung löslicher Thiosulfate auf Ferrosalze nach der Gleichung: \documentclass{article}\pagestyle{empty}\begin{document}$$ 4{\rm M}_2 {\rm S}_2 {\rm O}_3 + {\rm FeX}_2 = 3{\rm Me}_2 {\rm SO}_4 + {\rm FeS}_2 + {\rm 2MX} + {\rm 3s}{\rm .} $$\end{document}. Die ersten drei Methoden können allgemein bezeichnet werden als Einwirkung von Schwefel auf Ferrosulfid: (a) in saurer Lösung, (b) in fast neutraler Lösung, und (c) in alkalischer Lösung, da wir bei 1. annehmen können, daß sich zuerst Ferrosulfid durch Einwirkung von Schwefelwasserstoff auf Ferrosalz bildet und da wir bei 3. wissen, daß Polysulfide zuerst ein Gemisch von Ferrosulfid und Schwefel fallen. Markasit erhielt man mit Sicherheit nur nach Methode 1; niedere Temperatur und freie Säure begünstigen seine Bildung. Eine Lösung mit etwa 1 % freier Schwefelsaure bei 100° gibt reinen Markasit. Weniger saure Lösungen bei höherer Temperatur geben Gemische von Markasit und Pyrit. Die anderen Verfahren liefern Pyrit, der unter gewissen Bedingungen mit amorphem Disulfid gemischt sein kann. Es ist möglich, daß etwas Markasit nach Methode 4 gebildet wird.
    Additional Material: 23 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19120760110
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...