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  • Polymer and Materials Science  (811)
  • LUNAR AND PLANETARY EXPLORATION
  • 1965-1969  (812)
  • 1935-1939  (1)
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamics of polyether solutions (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 1495-1511 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Measurements are reported of the vapor pressures and the heats and volumes of mixing of solutions of poly(ethylene glycol dimethyl ether) in chloroform and in carbon tetrachloride. The measurements have been used to calculate the thermodynamic mixing functions for mixing with zero volume change. These values have been compared with the predictions of the lattice theory of mixtures at three different levels of approximation, viz., the generalized “first approximation” theory of Barker, the “zeroth approximation” theory, and the Flory theory. In the hydrogen-bonding chloroform solutions the Barker theory is more successful than the other forms of the lattice theory. The results have also been used, in conjunction with those for solutions of poly(propylene glycol dimethyl ether) in the same two solvents, to test the ability of the Barker theory to correlate the properties of related systems. Good correlation is found between the two carbon tetrachloride solutions but not between the chloroform solutions. It is probable that the side-chain methyl groups in the propylene oxide repeating unit cause the hydrogen-bonding interaction to be weaker in this polymer than it is in the polymer with the ethylene oxide repeating unit.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.160070906
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  • 2
    Electronic Resource
    Electronic Resource
    Über aromatische polyamide mit heterocyclischen ringsystemenHerrn Professor Dr. K. HANSEN zum 60. Geburtstag gewidmet (1969)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 130 (1969), S. 103-144 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In the production of high molecular weight aromatic polyamides which are soluble in polar solvents, novel aromatic diamines with oxdiazole, triazole, thiadiazole, thiazole, hydantoin, quinazolone and quinazolinedione ring systems - some of the novel aromatic diamines contain ether or sulfone groups - are reacted with aromatic dicarboxylic acid dichlorides (e.g. iso- or terephthaloyl dichloride) in polar organic solvents (e.g. N.N-dimethylacetamide or N-methyl-pyrrolidone).Filaments and fibres which possess a very good strength and a high thermal stability can be produced. Polyamides of diamines with quinazolinedione ring systems are most stable to high temperatures and are further distinguished by being only slightly liable to combustion.The new polyamides dissolved in polar solvents are suitable in the production of flexible films which are stable to high temperatures.
    Notes: Zur Herstellung von hochmolekularen aromatischen Polyamiden, die in polaren Lösungsmitteln löslich sind, wurden neue aromatische Diamine mit Oxdiazol-, Triazol-, Thiadiazol-, Thiazol-, Hydantoin-, Chinazolon- und Chinazolindion-Ringsystemen, die zum Teil auch noch Äther- oder Sulfongruppen enthalten, mit aromatischen Dicarbonsäuredichloriden (z. B. Iso- oder Terephthaloyldichlorid) in polaren organischen Lösungsmitteln (z. B. N.N-Dimethylacetamid oder N-Methylpyrrolidon) umgesetzt.Es konnten Fäden und Fasern hergestellt werden, die eine sehr gute Festigkeit und eine hohe Temperaturbeständigkeit aufweisen. Polyamide aus Diaminen mit Chinazolindion-Ringsystemen waren thermisch am beständigsten und zeichnen sich außerdem durch eine sehr geringe Brennbarkeit aus.Aus ihren Lösungen in polaren Lösungsmitteln lassen sich die neuen Polyamide auch zu geschmeidigen, hochtemperaturbeständigen Filmen verarbeiten.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1969.021300106
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  • 3
    Electronic Resource
    Electronic Resource
    Simultaneous occurrence of chain end and random initiation during thermal degradation of poly(methyl methacrylate) (1968)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 115 (1968), S. 268-274 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die langsame, zweite Stufe des thermischen Abbaus von Polymethylmethacrylat wurde erneut untersucht. Für den Fall, daß die „Depolymerisationslänge“ (zip length) kürzer ist als die Kettenlänge des Polymeren, wird an Hand einer einfachen Theorie gezeigt, daß ein Korrekturglied Für die Initiierung des Abbaues vom Kettenende her in die kinetischen Gleichungen eingeführt werden muß, um die Geschwindigkeit der Bildung des Monomeren vollständig zu beschreiben.
    Notes: The „slow“ second stage of the thermal degradation of poly(methyl methacrylate) is reexamined. It is shown, by means of a simple theory, that when the zip length is less than the mean molecular chain length an element of chain end initiation must be included in the kinetics to describe fully the rate of monomer formation.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1968.021150124
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  • 4
    Electronic Resource
    Electronic Resource
    Isomorphism phenomena in systems containing fluorinated polymers and in new fluorinated copolymers (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 4263-4278 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: High molecular weight vinyl fluoride (VF)-vinylidene fluoride (VF2) and vinyl fluoride (VF)-tetrafluoroethylene (TFE) copolymers in a wide range of compositions have been synthesized at low pressure at 25°C. with the aid of a catalytic system consisting of triisobutyl boron activated with molecular oxygen. With the same catalytic system, highly crystalline homopolymers of VF and VF2, melting above the usually reported temperatures, have been obtained. The x-ray and thermal analyses of crystalline molecular mixtures of PVF and PVF2, as well as of VF-VF2 copolymers, have shown that in both cases the monomeric units of the two types may be present in the same crystallites, giving rise to a phenomenon very similar to the isomorphism in the case of low molecular weight substances; an analogous phenomenon was already described by some of us1 for other polymeric systems. In the actual case we have observed the isomorphism between the VF and VF2 monomeric units in all the range of compositions, both for the homopolymer mixtures and for the copolymers. The VF-TFE copolymer samples, in the range of compositions examined (0-75% in TFE) show a crystal structure essentially similar to that of PVF. Due to the fact that the crystal structure of PVF is not strictly analogous to that of PVFE, in the compositions containing 75-100% TFE units a phenomenon of isodimorphism, or isopolymorphism, probably takes place. Over a wide range of compositions of the monomeric reactant mixture, a marked tendency for formation of alternating (...ABAB...)sequences within the copolymer chains has been observed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100031222
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  • 5
    Electronic Resource
    Electronic Resource
    Stereoregularity of polyacrylonitrile determined by NMR (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 2875-2881 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The NMR spectrum of polyacrylonitrile is interpreted and the tacticity of three polyacrylonitrile samples prepared at different temperatures in the range from -78 to 120°C. determined. The ratio between isotactic and syndiotactic units is about 50:50 for all the three samples examined.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150051115
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal degradation of poly(methyl α-phenylacrylate) (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 3067-3074 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Volatile products, molecular weight changes, and rates of volatilization have been examined during the thermal decomposition of poly(methyl α-phenylacrylate) in vacuum at 210-280°C. In the early stages of the decomposition, initiation occurs at random within the polymer backbone to give radicals which unzip exclusively to monomer, with a kinetic chain length of about 500. Later in the reaction, chain-end initiation becomes important and predominates beyond about 45% conversion. There is no evidence that transfer reactions occur during the degradation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150071103
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  • 7
    Electronic Resource
    Electronic Resource
    Bonding polyethylene to metals (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 1553-1562 
    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 process for adhering polyethylene to aluminum was developed which involves treating the aluminium substrate successively with chromic acid and then a selected organic acid. Certain organic acids utilized in this process appeared to produce a synergistic effect on the adhesion. This process, which required no modification or treatment of the polymer, resulted in peel strengths forty times greater than that obtained on untreated aluminum. Tensile shear values for the polyethylene-aluminum bond were greater than 2800 psi. The materials used for treating the metal in this system produced a maximum in the obtainable peel strength. Furthermore, minor changes in the etching acids resulted in drastic changes in the adhesion values.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1967.070110816
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  • 8
    Electronic Resource
    Electronic Resource
    Large-scale fractionation of poly(vinyl chloride) and characterization of the fractions (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 1539-1552 
    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 large-scale fractionation of poly(vinyl chloride) (3000 g.) has been carried out by a fractional precipitation method. The molecular weight distribution of some fractions has been controlled by refractionation. The fractions have been also characterized by viscometry, osmometry, light-scattering, and glass transition temperature measurements. The data available in literature concerning the molecular weight characterization of poly(vinyl chloride) fractions have been critically reviewed. It has been shown that most of the viscometric and osmometric data are in good agreement when the molecular weights are below 105. Above 105 the literature discrepancies can be attributed to aggregation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1967.070110815
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  • 9
    Electronic Resource
    Electronic Resource
    Inhibierung der Korrosion von Eisen in Säuren mit Hilfe von organischen Schwefelverbindungen (1969)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 1012-1015 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Inhibition of iron corrosion in acid with the aid of organic sulphur compoundsTests were carried out with Armco-iron in 1 n 10%-aqueous ethanol sulphate with the addition of n-butyl, s-butyl, n-hexyl, n-octyl, n-decyl, benzyl and phenylmercaptane, o- and m-thiokresol. The purpose was to determine the inhibition effect on the loss of weight and on the embrittlement through hydrogen adsorption. The inhibition effect is probably governed by adsorption via a free pair of sulphur electrons. The sulphur charge is therefore the controlling factor which also explains the effect of the chain length which affects the electron density at the sulphur. The inhibition effect has a maximum with C8 whilst, with larger chains, a screen effect is again apparent. The adsorption of hydrogen is first stimulated by low inhibitor concentrations, and later inhibited. But there is no clear correlation between the effect on corrosion and that on hydrogen adsorption.
    Notes: Versuche rnit Armco-Eisen in 1 n schwefelsaurem 10%igem wäßrigem Äthanol unter Zusatz won n-Butyl-, s-Butyl-, t-Butyl-, n-Hexyl-, n-Octyl-, n-Decyl-, Benzyl- und Phenylmercaptan, o- und m-Thiokresol. Bestimmt wurde die Hemmwirkung auf den Gewichtsverlust und auf die Versprödung durch Wasserstoffaufnahme. Die Hemmwirkung ist wahrscheinlich bedingt durch Adsorption über ein freies Elektronenpaar des Schwefels. Die Ladung am Schwefel ist daher der kontrollierende Faktor; daraus erklärt sich auch die Wirkung der Kettenlänge, welche die Elektronendichte am Schwefel verändert. Die Wirksamkeit der Inhibitoren erreicht bei C8 ein Maximum, während bei längeren Ketten wieder eine Abschirmung auftritt. Die Aufnahme von Wasserstoff wird durch geringe Inhibitorkonzentrationen stimuliert, später gehemmt, doch entsteht keine eindeutige Beziehung zwischen der Wirkung auf die Korrosion und auf die Wasserstoffaufnahme.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19690201206
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  • 10
    Electronic Resource
    Electronic Resource
    Über einen Zusammenhang zwischen Korrosionsschutzwirkung und Kompressibilität hochpolymerer Verbindungen (1965)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 16 (1965), S. 490-494 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: A relationship between corrosion protection effect and compressibility of high-polymer compoundsA relationship has been established between the protective ability of high polymers spread upon surfaces of iron and the compressibility of the same monolayers on a water surfaces. The protection varies inversely with the square root of the compressibility. High polymers with a network from clathrates with crystalloid compounds of suitable size. It is shown that the protecting effect of the clathrates is higher and correspondingly that their compressibility is lower than that of the polymers alone. This is attributed to a “sealing” of the polymer mesh by the enclosed compounds.
    Notes: Eine Beziehung zwischen der Schutzwirkung von auf Eisenberflächen gespreiteten Hochpolymeren und der Kompressibilität von Monoschichten derartiger Polymerer auf Wasseroberflächen wurde ermittelt. Die Schutzwirkung ändert sich umgekehrt proportional der Wurzel aus der Kompressibilität. Hochpolymere mit vernetzter Struktur bilden mit kristalloiden Verbindungen geeigneter Größe Clathrate. Es wird gezeigt, daß die Schutzwirkung der Clathrate größer ist und daß daher ihre Kompressibilität geringer ist als die der Polymeren allein. Diese Tatsache wird einer „Versiegelung“ der Polymer-Maschen durch die eingeschlossenen Verbindungen zugeschrieben.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19650160607
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