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  • Chemistry  (434)
  • Polymer and Materials Science  (219)
  • Physics  (37)
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  • 1980-1984  (247)
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  • 1980  (247)
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  • 1980-1984  (247)
  • 1955-1959  (194)
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  • 1
    Digitale Medien
    Digitale Medien
    Investigation of the phase equilibrium and interaction mechanism of cardopolyimides with antimony trichloride (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 727-731 
    Details
    ISSN: 0323-7648
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/actp.1980.010311201
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  • 2
    Digitale Medien
    Digitale Medien
    Crystallization of alkyl-aromatic polyimides (polyalkanimides) (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 247-263 
    Details
    ISSN: 0098-1273
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: 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.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1980.180180208
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  • 3
    Digitale Medien
    Digitale Medien
    Kinetic studies of structure formation during anionic adiabatic polymerization of ε-caprolactam (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 1523-1532 
    Details
    ISSN: 0098-1273
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: 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.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1980.180180704
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  • 4
    Digitale Medien
    Digitale Medien
    Viscoelastic properties of linear polymers in the fluid state and their transition to the high-elastic state (1980)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 20 (1980), S. 1138-1146 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The experimental results of the Viscoelastic properties of linear polymers of narrow molecular weight distribution (MWD) and of their mixtures have been analyzed and generalized. Based on the study of the properties of polymers of narrow MWD, we propose a classification of high molecular weight compounds. It specifies a distinct boundary between oligomers and polymers, assuming that the most important feature of polymers is the manifestation of large high-elastic recoverable deformations of entropy character. For polymers to be characterized, not the absolute molecular weight is essential, but the molecular weight referred to the boundary values. The corresponding state for polymers is attained at temperatures 100°C away from the glass temperature. The transition from the fluid to the high-elastic state with increasing deformation rate (or frequency for cyclic deformation) has been studied. Transition to the high-elastic state takes place over a narrow stress range (0.1-1.0 dynes/cm2), independent of molecular weight, whereas the critical deformation rates (frequencies), like viscosity, depend greatly on molecular weight. An increase in the amount of deformation shifts, to u certain extent, this transition to lower Kites of deformation (frequencies). In the region of deformation rates (frequencies) corresponding to the high-elastic state, the effect of large deformations during shear manifests itself largely in the tear-off of polymers Iron, the confining surfaces and in specimen rupture. Polydispersity has a strong effect on the properties of polymeric systems. As the rate of deformation is increased, the transition proceeds successively from the higher molecular weight components. This relaxational transition is tantamount to a change of the structure for polymeric systems. It is responsible for non-linear, particularly, non-Newtonian behavior of such systems. The transition to the high-elastic state and all the related phenomena are observed also in concentrated solutions of high molecular weight polymers. The long-term durability of un-cured rubbers in the high-elastic state is described by the same relationships.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760201705
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  • 5
    Digitale Medien
    Digitale Medien
    Synthese und Eigenschaften von Polykondensationspolymeren auf der Grundlage asymmetrischer Ausgangsverbindungen (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 100-107 
    Details
    ISSN: 0323-7648
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/actp.1980.010310206
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  • 6
    Digitale Medien
    Digitale Medien
    Reactivation of “irreversibly” denaturated enzymes (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 22 (1980), S. 247-251 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260220121
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  • 7
    Digitale Medien
    Digitale Medien
    Investigation of fermentors with various contacting devices (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 22 (1980), S. 799-820 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: In this work, earlier published work on the development and investigation of fermentors with various contacting arrangements is reviewed. Methods and results of investigations on optimal construction of contacting plates are presented, and mass transfer and other characteristics of the performance of the equipment are discussed. Comparative estimates of various methods of determining mass transfer coefficients are presented. The construction and basic operating characteristics of several column fermentors with various contacting arrangements are described.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260220406
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  • 8
    Digitale Medien
    Digitale Medien
    Gegen die Spannungsrißkorrosion beständige nichtrostende Manganchromstähle (1980)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 31 (1980), S. 34-45 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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).
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19800310106
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  • 9
    Digitale Medien
    Digitale Medien
    Dependence of surface composition of Zr—Ni intermetallic compounds on their bulk composition and heat treatment (1980)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 2 (1980), S. 207-211 
    Details
    ISSN: 0142-2421
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: 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.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/sia.740020604
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  • 10
    Digitale Medien
    Digitale Medien
    Untersuchungen zur Bildung von Polymeren auf Basis von Furfurylidenacetonen (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 587-591 
    Details
    ISSN: 0323-7648
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/actp.1980.010310911
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