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  • Polymer and Materials Science  (149)
  • 1980-1984  (138)
  • 1955-1959  (11)
  • 1950-1954
  • 1980  (138)
  • 1956  (11)
  • 1
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird die Phasentrennung der Lösungen von Cardopolypyromellithimiden und -polynaphthylimiden mit Fluoren-, Phthalid- und Anthronseitengruppen in geschmolzenem Antimontrichloid untersucht. Dabei wird gefunden, daß die Polypyromellithimide mit Fluoren- und Phthalidseitengruppen sowie das Polynaphthylimid des Anilinphthaleins bei der Phasentrennung der Lösungen kristallisieren. Schließlich werden die Struktur der aus den Lösungen erhaltenen Polymere und der Mechanismus der Wechselwirkung zwischen den Polyimiden und dem Antimontrichloid betrachtet.
    Notes: Phase separation of solutions of cardo poly(pyromellitic imide)s and poly(naphtholylene imide)s with fluorene, phthalide and anthrone groups in melted SbCl3 is investigated. It is shown that poly(pyromellitic imide)s with fluorene and phthalide side groups are crystallized during phase separation of corresponding solutions. The structure of polymers obtained from solutions and the mechanism of polymide-SbCl3 interaction are studied.
    Additional Material: 4 Ill.
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  • 2
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polyalkane imides based on 3,3′,4,4′-diphenyloxidetetracarboxylic, pyromellitic and 1,4,5,8-naphthalenetetracaboxylic acids, and aliphatic diamines containing 4, 6, 8, 10, or 12 methylene groups have been studied. Relations governing the effect of structure on solubility, heat resistance, density, and crystallizability have been established. Conformation analysis has been carried out and models of the macromolecules have been constructed. The morphology of the crystalline polymers has been studied. For the polymers of the given class, crystallization capability is shown to be associated with the conformational flexibility of the macromolecular unit determining a given acid moiety by the number of methylene groups in the diamine unit.
    Additional Material: 10 Ill.
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  • 3
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of crystallization and structure formation of polycaproamide (PCA) during anionic adiabatic polymerization of ε-caprolactam was studied. The adiabatic crystallization was shown to comprise three successive stages. In the first stage PCA forms dendritelike structures, the space between which is filled with the monomer. In the second stage rather rapid crystallization proceeds to give large loose spherulites. The dendritic structures serve as nuclei for development of spherulites. In the third stage slow secondary crystallization occurs. It is accomplished by crystallization of the residual amorphous substance located both in the dendritic nucleus and throughout the volume of the spherulites. This process is followed by the partial disappearance of the dendritic nuclei and by thickening of lamellae, which results in a substantial densification of initial structures and appearance of fine spherulites. As a result, a fine spherulitic structure with 50% crystallinity is formed.
    Additional Material: 6 Ill.
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  • 4
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The effect of conditions of synthesis on the chemical structure and properties of polymers from symmetric and asymmetric monomers is discussed for polyesters prepared by non-equilibrium polycondensation. Both homogeneous and heterogeneous polycondensation systems are investigated.
    Notes: An durch Nichtgleichgewichtspolykondensation dargestellten Polyestern wird der Einfluß der Synthesebedingungen auf den Aufbau und die Eigenschaften von Polymeren aus symmetrischen und asymmetrischen Ausgangsmonomeren diskutiert. Es werden homogene und heterogene Polykondensationssysteme untersucht.
    Additional Material: 6 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 31 (1980), S. 34-45 
    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: Stress-corrosion resistant stainless manganese chromium steelsThe following conclusions may be drawn from the results of investigations into the stress corrosion cracking of austenitic and austeno-ferritic MnCr steels (19-22Mn, 13-18Cr, additions of Mo, V, Nb, Ti, N, B):Addition of nitrogen gives rise to a decrease of stress corrosion cracking resistance in magnesium chloride, sodium chloride with potassium dichromate and water at high temperatures. The same applies to the influence if nickel on corrosion in magnesium chloride and water, and for molybdenum in magnesium and sodium chlorides. From among laboratory melts the type 05 Mn 19Cr 13 had the highest resistance, followed by its modifications with additions of boron, vanadium, molybdenum, titanium, niobium and nitrogen. From among the semi-technical melts the nitrogen containing steels turned out to be least resistant, too. During further investigations the chromium level of 13% turned out to be insufficient to prevent pitting in sodium chloride solutions including seawater.
    Notes: Aus den Ergebnissen von Untersuchungen zur Spannungsrißkorrosion von austenitisch-ferritischen MnCr-Stählen (19-22 Mn, 13-18 Cr, Zusätze von Mo, V, Nb, Ti, N, B) lassen sich die folgenden Schlüsse ziehen:Stickstoff verringert die Beständigkeit gegen Spannungsrißkorrosion in Magnesiumchlorid, Natriumchlorid mit Kaliumdichromat und Wasser bei hohen Temperaturen. Gleiches gilt für den Einfluß von Nickel auf die Korrosion in Magnesiumchlorid und Wasser sowie für Molybdän in Magnesium-und Natriumchlorid. Die höchste Beständigkeit erreichte von den Laborschmelzen der Typ 05 Mn 19 Cr; es folgen Modifikationen dieses Typs mit Zusatz von Bor, Vanadium, Molybdän, Titan und Niob sowie Stickstoff. Auch bei der Prüfung der halbtechnischen Schmelzen erwiesen sich die stickstoffhaltigen Stähle als am unbeständigsten. Der Chromgehalt von 13% erwies sich bei weiteren Untersuchungen als nicht ausreichend zur Verhinderung der Lochkorrosion in Natriumchlorid (auch Meerwasser).
    Additional Material: 12 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 2 (1980), S. 207-211 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: X-ray photoelectron spectroscopy (ESCA) was used to study the dependence of Zr2Ni, ZrNi and ZrNi5 intermetallic compound surface compositions upon duration of heating in air at 200 °C. The changes in relative intensities of Zr 3d, Ni 3p and Ni 2p lines in the course of ion sputtering and their dependences on take-off angle of photoelectrons were measured. The post-oxidation surface composition was: Ni (NiO) in the uppermost layer, its content increased with the time of heating. The following layer was enriched with ZrO2. The minimum of Ni/Zr atomic ratio was observed for 10-40 Å depth, depending on intermetallic compound composition and heating time. The next layer was enriched with Ni and for 1000-1600 Å depth the stoichiometric bulk composition was attained. The formation of a Ni rich layer over ZrO2 is explained by Ni diffusion through the oxide film.
    Additional Material: 10 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 587-591 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polymers of furfurylidene acetones are formed at temperatures above 150°C. In the presence of acid catalysts the reaction proceeds, in dependence on the acid strength, already at 100°C onwards. The double bond of furane is not subjeceted to polymerization below 250°C. Above 200°C polycondensation accompanied by formation of water was observed. Above 500°C heterocyclic units are degraded under formation of carbon monoxide and hydrocarbons.
    Notes: Die Bildung von Polymeren aus Furfurylidenacetonen erfolgt bei Temperaturen oberhalb 150°C. In Gegenwart von Säurekatalysatoren erfolgt die Reaktion in Abhängigkeit von der Säurestärke bereits ab 100°C. Die Doppelbindungen des Furans polmerisieren unterhalb 250°C nicht. Polykondensationsprozesse unter Wasserabspaltung werden über 200°C beobachtet. Bei Temperaturen über 500°C beginnen sich die Heterocyclen unter Bildung von Kohlenmonoxid und Kohlenwasserstoffen zu zersetzen.
    Additional Material: 9 Ill.
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  • 8
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: MoCl5, WCl6, and OMoCl4 were found to be effective initiators for the polymerization of acetylene and its monosubstituted derivatives RC=CH. The polymerization proceeded in homogeneous and heterogeneous media and was carried out in nonpolar (chloroalkanes, aromatic hydrocarbons) and polar (THF, acetone, dioxane, carboxylic acids) solvents to give a high yield of polymers.
    Additional Material: 2 Tab.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 85-89 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Kondensation der beiden Polymere in Tetrahydrofuran in Gegenwart von Triethylamin führt zur Pfropfung von Polyarylensulfonoxid auf Polychlorphosphazen mit folgender substitution der hydrolytisch unbeständigen Chloratome im Polyphosphazenteil des Pfropfcopolymers durch Trifluorethoxygruppen. Die Reaktionsprodukte wurden mittels selektiver Extraktion in drei in Aufbau und Eigenschaften unterschindliche Fraktionen aufgetrennt.
    Notes: Grafting of polyarylensulfone oxide on polychlorophosphazene was accomplished by condensation of the two polymers in tetrahydrofurane in the presence of triethylamine. This was followed by substitution of hydrolytically unstable chlorine atoms in the polyphosphazene part of the grafted copolymer by trifluoroethoxy groups. The reaction products were separated by selective extraction in three fractions differing in composition and properties.
    Additional Material: 3 Tab.
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 19 (1980), S. 231-240 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper deals with the light scattering from particles rotating in a flow with a transverse velocity gradient. It is theoretically substantiated and experimentally proved that the scattered light spectrum contains reliable information of the particle configuration and dimensions. The proposed technique may prove also very promising for the analysis of particle polydispersion.
    Additional Material: 2 Ill.
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