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  • 1980-1984  (5)
  • 1950-1954  (6)
  • 1
    Electronic Resource
    Electronic Resource
    DERIVATIVES OF o- AND p-(α-PHENYLETHYL)PHENOL (1950)
    s.l. : American Chemical Society
    The @journal of organic chemistry 15 (1950), S. 587-592 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01149a023
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Poly(2,6-dimethyl-1,4-phenylene oxide)-Polystyrene Interpenetrating Polymer Networks (1980)
    s.l. : American Chemical Society
    Macromolecules 13 (1980), S. 1016-1018 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma60076a050
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Gegenzbiete der Lebensmittelwissenschaft (1954)
    Springer
    European food research and technology 99 (1954), S. 311-312 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01364052
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Die Sonne als Kompaß im Leben der Bienen (1950)
    Springer
    Cellular and molecular life sciences 6 (1950), S. 210-221 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173654
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Gibt es in der „Sprache“ der Bienen eine Weisung nach oben oder unten ? (1953)
    Springer
    Journal of comparative physiology 35 (1953), S. 219-245 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung 1. Liegen 2 Futterplätze in der gleichen Himmelsrichtung und in gleicher Entfernung vom Stock, aber in verschiedener Höhe, so geben die tanzenden Bienen ihren Stockgenossen nur die Himmelsrichtung und Entfernung aber nicht die Höhe bekannt. 2. Liegt ein Futterplatz lotrecht über oder unter dem Heimatstock, und führt der Weg dorthin an einer Felswand hinauf oder hinunter, so weisen die Tänzerinnen im 1. Falle die Richtung zur Wand, im 2. die Richtung von der Wand weg und leiten auf diese Weise die Kameraden erfolgreich zum Ziel. Ihr Verhalten erklärt sich wahrscheinlich aus ihrer Einstellung zur Wand, bzw. von der Wand weg, bei ihrem Flug nach oben oder unten. 3. Wenn auf dem Wege lotrecht nach oben oder unten die Umgebung keine Möglichkeit zu einer eindeutigen Orientierung der Körperstellung bietet (Funkturm, Echelsbacher Brücke), dann unterbleibt eine Richtungsweisung. Die Bienen machen Rundtänze, auch wenn die Entfernung der Futterstelle so groß ist, daß sie in der horizontalen Ebene eine eindeutige Richtungsweisung auslöst. Sie veranlassen durch diese Rundtänze ihre Stockgenossen zum Absuchen des Bodens in der Umgebung des Stockes. Ausführlichere Zusammenfassungen der Einzelergebnisse findet der Leser jeweils am Ende der Versuchsreihen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00340962
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  • 6
    Electronic Resource
    Electronic Resource
    Orientierungsvermögen und Sprache der Bienen (1951)
    Springer
    Naturwissenschaften 38 (1951), S. 105-112 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00589765
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  • 7
    Electronic Resource
    Electronic Resource
    Himmel und Erde in Konkurrenz bei der Orientierung der Bienen (1954)
    Springer
    Naturwissenschaften 41 (1954), S. 245-253 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00634944
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Polyurethane ionomers. I. Structure-properties relationships of polyurethane ionomers (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 2467-2479 
    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: The influence of chemical structure on mechanical properties of polyurethane ionomers (PU ionomers) has been examined. NCO-terminated prepolymers prepared from primarily 4,4-methylene bis(phenyl isocyanate) (MDI) and poly(oxytetramethylene) glycol (PTMO) were chain extended with tertiary amine-containing diols and the ionomers obtained by quaternization of the prepolymers. The N-methyldiethanolamine chain extender gave the best physical properties. The mechanical properties of the PU ionomers were improved with decreasing chain length of PTMO and with increasing concentration of quaternary ammonium centers (or NCO/OH ratio of PU prepolymers). A lower degree of quaternization resulted in a decrease in the mechanical properties of the resulting PU ionomers, but their properties could be improved by post-quaternization. The adhesion of the PU ionomers to aluminum and the glass transition temperature increased with increasing concentration of quaternizing centers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290804
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Recent advances in interpenetrating polymer networks (1982)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 22 (1982), S. 1143-1152 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: We review the synthesis, morphology, and physical and mechanical properties of IFNs as well as the related pseudo-IPNs, in which only one of the polymers is crossliriked. Recent studies have shown that the degree of phase separation achieved in these materials is strongly dependent on the compatibility of blends of the linear polymer constituents of the IPN components as well as the kinetics of chain extension and the presence of grafting between component polymers. We illustrate this by a series of IPNs consisting of a polyurethane and an acrylic copolymer. The acrylic is a typical automotive enamel. An enhancement in properties results, which is dependent on the amount of grafting and the kinetics of polymerization. Also discussed are IPNs of a polyurethane and an epoxy, which exhibit a synergism in adhesive properties, and IPNs of a RIM polyurethane with several epoxies and unsaturated polyesters. In addition, also reported are the preliminary studies on the first successful preparation of a three-component IPN, consisting of a polyurethane, an epoxy, and an acrylic.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760221715
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks from polyurethanes and methacrylate polymers. I. Effect of molecular weight of polyols and NCO/OH ratio of urethane prepolymers on properties and morphology of IPNs (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 2547-2557 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two types of reinforced elastomeric interpentrating polymer network (IPN) were prepared by simultaneous polymerization and crosslinking in solution. The first type consisted of polyurethane-poly(methyl methacrylate) (PU/PMMA), and the second, of polyurethane-poly(methyl methacrylate-methacrylic acid) PU/P(MMA-MAA) of constant composition (90/10) and (80/20) by weight, respectively. The members of each type differed in the NCO/OH ratio of the PU prepolymer and the molecular weight (MW) of the polyol in the PU component because we wished to investigate systematically the effect of changing the NCO/OH ratio and MW of the polyol on the mechanical properties and morphology of the resulting IPNs. The mechanical properties, particularly the modulus of both tyes of IPN, increased with increasing NCO/OH ratio and decreased with increasing MW of the polyol in the PU. The morphology of the IPNs was studied by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). Improved phase compatibility and decreasing extent of phase separation was observed in both types of IPN with increasing NCO/OH ratio and decreasing MW of the polyol used in the PU. These results may imply that improved interpenetration results from increasing the NCO/OH ratio and decreasing the MW of the polyol in the PU component. The fact that the effect is more pronounced with the type of PU-P(MMA-MAA) IPN can be rationalized as due to the additional hydrogen bonding between the carbonyl in the carboxyl groups and the urethane or urea groups in the PU component.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170210835
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