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  • 1980-1984  (32)
  • 1890-1899  (8)
  • General Chemistry  (24)
  • Polymer and Materials Science  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Characterization of the Behaviour of Part-Through Cracks under stable crack extension (1983)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 14 (1983), S. 45-57 
    Details
    ISSN: 0933-5137
    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: Stabiles Rißwachstum-Charakterisierung des Verhaltens nicht-wanddurchdringender RisseDas Verhalten von nicht-wanddurchdringenden Fehlern, die durch halb-elliptische Oberflächenfehler dargestellt werden, unter beliebiger Normalspannungsverteilung (linearisiert) wird untersucht. Einflüsse des Fehlerwachstumsgesetzes, der Fehlerlage, der Geometrie und der Spannungsumlagerungen zusammen mit Plastizitätseffekten werden diskutiert. Die relative Endfehlerlänge für den Wanddurchbruch wird bestimmt. Die Ergebnisse werden erörtert im Zusammenhang mit den Bedingungen für Leck-vor-Bruch, promptes-Versagen und kein-Leck-vor-Bruch/kein-promptes Versagen.
    Notes: The behaviour of part-through cracks, modelled by semi-elliptical surface cracks, under variable normal stresses (linearized) is investigated. The stable crack contour, given as crack aspect ratio, is determined for an infinite body as a circle; in a finite body semi-ellipses are “quasi”- stable. The effects of crack growth law types, crack location, geometry and stress redistribution together with plasticity effects are discussed. The final relative crack lengths for wall penetration are determined. The data are discussed with respect to the conditions for leak-before-break, sudden rupture and no-leak-before-break/no-sudden-rupture.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19830140209
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Adhesion of block copolymers to glass: Lap shear strengths as a function of bonding conditions (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 1429-1437 
    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: ABA poly(styrene-b-isoprene) block copolymers with various molecular weights and composition were used as heat activated films in simple overlap glass joints. The influence of bonding temperature on their shear strength at break was investigated. On increase of temperature, the joint resistance for most of the copolymers passed through a maximum, which temperature was dependent on the molecular characteristics of the copolymers. The decrease in melt viscosity or chemical degradation could not explain the data. A morphological interpretation which fits well the present and previous observations is proposed and verified for one copolymer used in this work.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280416
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  • 3
    Electronic Resource
    Electronic Resource
    Solubility of isobutane and propane in polyethylene at high temperatures and low pressures (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 725-741 
    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 novel procedure was developed to measure the solubility of isobutane and propane in both low and high-density polyethylene at temperatures to 500°F (260°C) and vapor pressures from 1 to 1500 torr (33 psia). These measurements represent the first known solubility measurements at these combined extremes of pressure and temperature. Excellent agreement was found when our data were extrapolated to higher pressures and compared with data from another source. In the temperature and pressure regions of interest in this work, the linear isotherms were fit with a form of the Flory-Huggins equation. With the equation in that form we can now estimate the ratio of solubilities of two solutes in a given polymer from pure solute data only. We can also predict the absolute solubility of nonpolar solutes in polyethylene at various temperatures and pressures using only critical temperatures and acentric factors of the solutes.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280227
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  • 4
    Electronic Resource
    Electronic Resource
    Factors affecting surgical alloy/bone cement interface adhesionPresented in part at the 5th Annual Meeting of the Society for Biomaterials, Clemson, SC, May, 1979. (1980)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 14 (1980), S. 639-651 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Interfaces were formed between acrylic bone cement and three commonly used surgical alloys (316L SS, Co—Cr—Mo, and Ti—6A1—4V), in an attempt to further define cementation parameters of acrylic bone cement for use in orthopaedic surgery. Metal/cement interfaces were made at three distinct times during the setting cycle of the cement and were cured for 1 hr, 1 day, and 1 week. The metals were prepared with roughly polished or finely polished prepassivated surfaces. Tensile bond strengths and residual cement on metal coverage data indicated that, for each metal system, interfaces created prior to and at the onset of the dough stage formed superior interfaces for implanation compared to those formed late in the dough stage. Furthermore, electropolishing plus prepassivation offered a more efficient bonding surface than mechanical polishing.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820140510
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  • 5
    Electronic Resource
    Electronic Resource
    Surface properties determine bioadhesive outcomes: Methods and results (1984)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 18 (1984), S. 337-355 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: This investigation developed experimental evidence for the influence of different surface energy states on tissue incorporation of biomedical materials. Implants of two smooth metals, each with three different surface energy states, were placed in the subdermal fascial plane of the backs of New Zealand White rabbits and were allowed healing times of 10 and 20 days. The implant surfaces were thoroughly characterized by physical-chemical criteria prior to surgical placement and again following removal from the tissue capsules generated by the host animals. Quantitative histopathologic analysis, using standard morphometric criteria, of the adjacent tissues revealed up to a threefold increase of fibroblastic-fibrocytic cells against the initially scrupulously cleaned, high-surface-energy materials. The cells were flattened and active, producing tenacious bonds through a thin pre-adsorbed protein-dominated “conditioning” film, that could be broken only by cohesive failure in the tissue itself. In contrast, the lower-surface-energy materials typical of standard dental implants were “walled off” by a cell-poor, nonadhesive capsule with a fibrous interface separated from a thicker “conditioning” film by a lipid-rich mucus zone. The advantages of proper surface treatment to favor the desired degree of biological adhesion are apparent.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820180404
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  • 6
    Electronic Resource
    Electronic Resource
    Polymere phthalocyanine und ihre vorstufen, 1. Reaktive oktafunktionelle phthalocyanine aus 1,2,4,5-tetracyanbenzol (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2127-2135 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 1,2,4,5-Tetracyanobenzene reacts under mild conditions with anionic reagents not to polymer but to low molecular weight, high substituted phthalocyanines: 2,3,9,10,16,17,23,24-octacyanophthalocyanine (3a) and tetrakis(1-imino-3-propoxyisoindolo)porphyrazine (3b). 3a is saponified to the octacarboxyphthalocyanine 3c and converted with hydrazine to tetrakis(1,4-diaminophthalazino)porphyrazine (3d). Low molecular metal chelates are synthesized starting from 3a and 3c. IR- and UV/VIS-spectra are discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811010
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  • 7
    Electronic Resource
    Electronic Resource
    Polymere Phthalocyanine und ihre Vorstufen, 31. und 2. Mitteilung: refs.1, 2.. In situ Gasphasensynthese und einführende elektrochemische Charakterisierung polymerer Phthalocyanine auf metallischen TrägernHerrn Prof. Dr. G. Manecke zum 65. Geburtstag gewidmet (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2633-2639 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The gas phase reaction of 1,2,4,5-tetracyanobenzene (3) with metal sheets like Cu, Ni, Co, Fe, and Ti exhibits the in situ formation of polymeric phthalocyanine coatings 1. The electrochemical behaviour of layers of 1 is investigated by means of cyclic voltametric measurements. Determination of layer-thickness and electrical resistance is also performed.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021821011
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization and morphology of thermoplastic interpenetrating polymer networks based on polystyrene and polystyrene-polyisoprene three-block copolymers (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 249-258 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Semi-interpenetrating polymer networks based on polystyrene and polystyrene-polyisoprene three-block copolymers (SIS) were prepared by anionic polymerization. Factors affecting synthesis, such as composition, molecular weight of either the unattached SIS or the polystyrene between crosslinks, elastomer content, have been varied. Their effect on network formation was examined by extraction experiments and swelling measurements. Their morphology was investigated by means of electron microscopy.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830124
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  • 9
    Electronic Resource
    Electronic Resource
    29Si NMR-untersuchungen an polykieselsäureestern (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1817-1822 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Linear and branched siloxanes were prepared by partial hydrolysis of silicon tetrachloride and by esterification of the products of hydrolysation with methyl and ethyl nitrite. 29Si NMR spectra made it possible to distinguish between the isomers of each oligomer up to the heptamer. Linear relationships between the 29Si chemical shifts of the ethyl and the methyl esters on one hand and between the ethyl esters and the poly(silicic acid)s on the other hand were observed. However, due to the different effect of neighboring building units, there are only poor relationships between the 29Si data of the esters and the chloro derivatives.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840906
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  • 10
    Electronic Resource
    Electronic Resource
    Meßprinzipien zur Charakterisierung von Blasensäulen-BioreaktorenVortrag von J. Lippert auf der Arbeitssitzung des Dechema-Ausschusses „Biotechnologie“ am 18. Februar 1981 in Frankfurt/M.Herrn Prof. Dr. phil. Hans Kroepelin zum 80. Geburtstag (1981)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 53 (1981), S. 967-967 
    Details
    ISSN: 0009-286X
    Keywords: Anemometrie ; Leitfähigkeitssonden ; Zweiphasenströmung ; Bioreaktor ; Turbulenz ; Blasensäule ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330531211
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