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  • Polymer and Materials Science  (10)
  • Crystal Structure
  • 1990-1994  (12)
  • 1960-1964
  • 1992  (12)
  • 1
    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: Einige für den kombinierten Polymer-Tensid-Einsatz in der tertiären Erdölförderung (EOR) diskutierte Substanzen wurden mittels statischer und dynamischer Lichtstreuung charakterisiert und bezüglich ihrer Anwendbarkeit in unterschiedlich salinaren Modellwässern durch rheologische und rheologisch-dynamische Messungen unter-sucht.Als Polymere wurden Xanthan sowie unterschiedlich hydrolysierte Polyacrylamide verwendet, als Tensid ein Ethylenglykolsulfonat. Es ließen sich Korrelationen zwischen mikroskopischen Strukturparametern (z. B. hydrodynamischer Radius, Trägheitsradius, Molekulargewicht, Gestaltparameter der gelösten Polymeren) und makroskopischem Verhalten wie Viskosität aufstellen, welche für den EOR-Einsatz wichtige rheologische Parameter darstellen.Mit ergänzenden Messungen (Oberflächenspannung, zeitabhängiges Viskositätsverhalten) können Aussagen über die Effizienz und Langzeitstabilität eingesetzter Polymer-Tensid-Slugs in unterschiedlich salinaren Lagerstätten gemacht werden.
    Notes: Some materials, suitable for application in polymer-surfactant flooding used in tertiary oil recovery (EOR), have been characterized by static and dynamic light scattering and studied in respect to their suitability in various model brines by measuring their rheological and dynamic-rheological behaviour. Xanthan and polyacrylamides of different degree of hydrolysis have been used as polymers, an ethylene glycol sulfonate as surfactant.Correlations have been established between microscopic structural parameters (Hydrodynamic radius, radius of gyration, molar mass, shape of the polymers) and the macroscopic behaviour, such as viscosity and elasticity, being important rheological parameters for EOR application. Additional investigations on surface tension and long term viscosity study lead then to a judgement for the efficiency and long term stability of polymer-surfactant slugs in various reservoirs of different salinity.
    Additional Material: 15 Ill.
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  • 2
    ISSN: 0935-9648
    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
    Additional Material: 2 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 43 (1992), S. 483-491 
    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: Corrosion and wear behaviour of materials for chemical engineeringIt has been estimated that 7.4 percent of all corrosion related failures are mechanically assisted (i.e. involve wear), and that such failure consume, or render useless, 37 million pounds of highly alloyed materials per year. Despite this, relatively little is known of the basic wear behaviour of alloys commonly used in the chemical processing industries, and little attention has been paid to the design of alloys for conditions involving simultaneous corrosion and wear.The objectives of this paper are three-fold. First, the various types of wear are described, and the alloy characteristics required to combat each of these types are discussed. Second, new wear data are presented for several alloys commonly used in the chemical processing industries. Third, a comparison is drawn between these well established materials and a newly introduced cobalt-based alloy designed specifically for corrosion/wear service.The conclusions of the paper are that hardness is a poor indicator of performance for most of wear, that the nickel-chromium-molybdenum alloys are considerably more resistant to cavitation erosion and galling than the austenitic and duplex stainless steels, and that the cobald-based alloy possesses exceptional resistance to slurry erosion, cavitation erosion, and galling.
    Notes: Aufgrund von Schadensstatistiken sind etwa 7,4% aller korrosionsbedingten Schadensfälle auf die Mitwirkung mechanischer Faktoren, z.B. Verschleiß, zurückzuführen, und derartige Schäden vernichten z.B. in den USA jährlich Werte entsprechend 16 800 t hochlegierter Werkstoffe.Trotzdem ist über der Verschleißverhalten der in großen Mengen in der chemischen Verfahrenstechnik eingesetzten Werkstoffe verhältnismäßig wenig Grundsätzliches bekannt; gleichermaßen hat man der Entwicklung neuer, sowohl korrosions- als auch verschleißbeständiger Werkstoff bisher kaum Aufmerksamkeit geschenkt (eine Ausnahme ist die Rauchgasentschwefelung).Die vorliegende Arbeit hat drei Ziele: zunächst sollen die verschiedenen Verschleißarten beschrieben und die Eigenschaften erörtert werden, die einen Werkstoff gegen bestimmte Verschleißarten beständig machen. Danach werden für einige Werkstoffe der chemischen Verfahrenstechnik neue Verschleißdaten aufgeführt. Schließlich werden diese gängigen Werkstoffe mit einer neuen Kobaltbasislegierung verglichen, die gezielt für den Einsatz unter kombinierter Korrosions- und Verschleißbeanspruchung entwickelt worden ist. Die aus den vorgelegten Daten zu ziehenden Schlußfolgerungen zeigen,- daß die Härte ein den meisten Verschleißarten wenig geeignetes Kriterium für den Verschleißwiderstand ist,- daß Nickel-Chrom-Molybdän-Legierungen gegen Kavitationserosion und Haftverschleiß wesentlich beständiger als austenitische Stähle und Duplexstähle sind und- daß eine neue Kobaltlegierung gegen Erosion durch Suspensionen, gegen Kavitationserosion und gegen Gleitverschleiß hervorragend beständig ist.
    Additional Material: 14 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 1173-1176 
    ISSN: 0887-6266
    Keywords: poly(ε-caprolactone) films on highly oriented PTFE substrate ; Brillouin spectroscopy of ultraoriented poly(ε-caprolactone) films ; crystallization of ultra-oriented poly(ε-caprolactone) on PTFE sustrate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 1043-1049 
    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: Urethanes of cellobiose and cellulose-containing uretdione groups are synthesized by the reaction of aliphatic and aromatic diisocyanate uretdiones with the saccharides. The syntheses are performed as a heterogeneous reaction in dimethyl acetamide using dibutyl tin dilaurate as a catalyst, as well as a homogeneous reaction in dimethyl acetamide-lithium chloride. Thus, Semisynthetic prepolymers are formed that offer the reactivity of (blocked) isocyanate groups. To demonstrate their reactivity, ring opening of the uretdiones is performed by the addition of a secondary amine to yield the corresponding ureas.
    Additional Material: 5 Ill.
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  • 6
    ISSN: 0009-286X
    Keywords: HTW-Vergasung ; Kohle ; Wirbelschicht ; Wirbelschichtvergasung ; Fluiddynamik ; Meßmethoden ; Synthesegas ; Kombikraftwerk ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 744-745 
    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
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 778-779 
    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
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  • 9
    ISSN: 0935-9648
    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
    Additional Material: 9 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 563-564 
    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
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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