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  • 1980-1984  (8)
  • 1984  (3)
  • 1983  (5)
  • Polymer and Materials Science  (7)
  • Computational Chemistry and Molecular Modeling
  • 1
    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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    Paper (German National Licenses)
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  • 2
    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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  • 3
    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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    Paper (German National Licenses)
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  • 4
    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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    Paper (German National Licenses)
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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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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Remarks on the molecular mechanical calculations of functionalized hydrocarbonsPresented in part at the Molecular Mechanics Symposium, Indianapolis, Indiana, June 23-24, 1983. (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 5 (1984), S. 299-306 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: Molecular mechanical calculations for hetero-substituted hydrocarbons present certain difficulties that are not encountered in dealing with hydrocarbons. Ways are proposed to overcome such difficulties, sometimes by two-step or iterative computation. The following topics are considered: fitting the force field by using data from studies in solution; ways to estimate atomic charges or, alternatively, bond moments; ways to account for field effects upon atomic charges and bond moments.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540050404
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The influence of stannous octanolate on the polymerization of acrylic compounds (1983)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 4 (1983), S. 221-225 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1983.030040405
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Selektive NMR T1- und NOE-Messungen zur Untersuchung lokaler Molekülbewegungen in gelösten Vinylchlorid/Vinylacetat-CopolymerenHerrn Professor Dr. habil. Joachim Ulbricht zum 60. Geburtstag gewidmet (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 490-493 
    Details
    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: 13C-NMR-measurements were carried out to investigate the local molecular motion of vinylchloride/vinylacetate-copolymers in solution. Using the conformational jump model the correlation times τ0 (isotropic molecular rotation) and τD (bond-orientation diffusion in the polymer chain) were determined by the measured T1- and NOE-values of the methine and methylene groups. With increasing VAC-content a longer T1, attributed to a change of tacticity and average length of the VC-sequences, was determined.
    Notes: 13C-NMR-Messungen wurden durchgeführt, um die lokale Molekülbeweglichkeit von Vinylchlorid/Vinylacetat-Copolymeren in Lösung zu untersuchen. Mit Hilfe des Konformationssprungmodells wurden die Korrelationszeiten τ0 (isotrope Molekülrotation) und τD (Bindungsorientierungsdiffusion innerhalb der Polymerkette) aus den gemessenen T1- und NOE-Werten der Methin- und Methylengruppen des Kettenrückgrats bestimmt. Für zunehmende VAC-Anteile wurde eine längere Spin-Gitter-Relaxationszeit festgestellt, die auf eine Taktizitäts- und Längenänderung der VC-Sequenzen zurückgeführt wurde.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010350703
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