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  • Articles  (33,867)
  • Springer  (16,388)
  • Springer Nature  (7,173)
  • Wiley  (5,780)
  • International Union of Crystallography  (2,608)
  • American Meteorological Society  (1,181)
  • De Gruyter  (737)
  • American Physical Society (APS)
  • 2000-2004
  • 1995-1999
  • 1980-1984  (26,103)
  • 1935-1939  (7,764)
  • 1930-1934
  • 1984  (26,103)
  • 1959
  • 1937  (7,764)
  • Chemistry and Pharmacology  (27,197)
  • Geosciences  (9,362)
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  • Articles  (33,867)
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  • 2000-2004
  • 1995-1999
  • 1980-1984  (26,103)
  • 1935-1939  (7,764)
  • 1930-1934
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  • 1
    Electronic Resource
    Electronic Resource
    Kinetic study on propylene polymerization by a high activity catalyst system: MgCl2/TiCl4/PhCO2Et-AlEt3/PhCO2Et (1984)
    Springer
    Polymer bulletin 11 (1984), S. 479-484 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Kinetic study was performed in short time propylene polymerization with a high activity-high stereospecificity catalyst system composed of MgCl2/TiCl4/PhCO2Et with AlEt3/PhCO2Et. The concentration of the active centers, [C *], the propagation rate constant, k p, and the chain transfer rate, r tr, were determined. The change of these values by the change of polymerization conditions, the concentration of monomer, AlEt3, and the temperature, were studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265491
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  • 2
    Electronic Resource
    Electronic Resource
    Polymerization by phase transfer catalysis (1984)
    Springer
    Polymer bulletin 11 (1984), S. 493-496 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polyethers from 1,4-bis(chloromethylene)-2,5-dimethoxybenzene and 4,4′-biphenol were obtained by phase transfer catalysis, using different catalysts and solvents. The molecular weights and yields were determined, showing a solvent effect and a influence of the catalysts used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045326
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  • 3
    Electronic Resource
    Electronic Resource
    Copolymerization of 9-anthrylmethylmethacrylate with maleic anhydride (1984)
    Springer
    Polymer bulletin 11 (1984), S. 511-515 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Copolymerization of 9-anthrylmethylmethacrylate with maleic anhydride is presented. The copolymerization reaction appears to be associated with the cycloaddition of maleic anhydride at the anthracene nucleus. It is also shown that for 9-anthrylmethylmethacrylate/maleic anhydride molar ratio lower than 1/2 the copolymers have an alternating structure with 1/2 composition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045329
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  • 4
    Electronic Resource
    Electronic Resource
    Changes of liquid-crystalline polymer structure with temperature (1984)
    Springer
    Polymer bulletin 11 (1984), S. 561-564 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Thermal changes in the structural state of liquid crystalline polymers with mesogenic side groups and the kinetics of mesophase formation were studied by means of smallangle X-ray scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045338
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  • 5
    Electronic Resource
    Electronic Resource
    Morphology of coalescence processes: secondary fracture, cracks and spherulites (1984)
    Springer
    Polymer bulletin 11 (1984), S. 579-584 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Similarity in the shapes of fracture curves and spherulite boundaries makes possible to generalize the respective theories to the case of coalescence of two spreading processes of growth, disturbances or excitations. The geometrical shape of a coalescence curve depends on three parametres: the distance of their spreading centres, the relation of spreading velocities and the time delay of the spreading. According to the character of the process, the shielding effect may take place. In this case, the coalescence curve is composed of two parts which are to be described separately.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045341
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  • 6
    Electronic Resource
    Electronic Resource
    Engineering plastics from lignin (1984)
    Springer
    Polymer bulletin 12 (1984), S. 1-5 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Low density polyurethane foams (ca. 2 lbs./cu. ft.) with acceptable strength and excellent flammability resistance properties were formulated with a commercial furan polyol containing 20% hydroxypropyl lignin derivative. Propylene oxide-modified lignin from two sources, kraft and organosolv lignin, were employed. The organosolv lignin derivative exhibited better foaming characteristics than the corresponding kraft lignin, which collapsed when the rising foam was touched for testing. The weight contribution of lignin derivative was limited to 20% by compatibility with the fluorocarbon blowing agent, and solubility in polyol. Preliminary tests encourage further research on structural materials containing hydroxypropyl lignin derivatives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258264
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  • 7
    Electronic Resource
    Electronic Resource
    Statistical treatment of allophanate crosslinking in the formation of polyurethane networks (1984)
    Springer
    Polymer bulletin 12 (1984), S. 33-40 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Crosslinking of polyurethanes by a reaction of isocyanate groups with urethane groups leading to trifunctional allophanate branch points is treated statistically using the theory of branching processes. The occurrence of gelation in the diol — diisocyanate system and its dependence on the excess of isocyanate groups and the intensity of allophanate formation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258269
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  • 8
    Electronic Resource
    Electronic Resource
    The penultimate unit effect of radical copolymerization (1984)
    Springer
    Polymer bulletin 12 (1984), S. 55-58 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The effect of polar β- and γ-substituents on the selectivity of alkyl radical additions to alkenes has been measured. Although these substituents don't influence the nucleophilicity of radicals they reduce the rate of addition to diethyl fumarate. It is concluded that the penultimate unit effect is a through space repulsive interaction of polar substituents between the radicals and the alkenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258272
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of α-methylstyrene-butadiene-α-methylstyrene linear block copolymers (1984)
    Springer
    Polymer bulletin 12 (1984), S. 71-77 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary α-methylstyrene-butadiene- α-methylstyrene linear block copolymers with a ‘pure’ block structure were prepared by sec-butyllithium and coupling agent in a four-step process. Their morphology is built up of microdomains of poly- α -methylstyrene, including the unbonded segments, dispersed in a polybutadiene matrix. Cylindrical domains arranged in a hexagonal lattice or irregularly shaped domains in a disordered phase are observed, depending on the molecular weight of the poly- α -methylstyrene segment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258275
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  • 10
    Electronic Resource
    Electronic Resource
    Thermotropic polyesters with mesogenic groups based on substituted hydroquinone units and highly flexible siloxan spacer in the main chain (1984)
    Springer
    Polymer bulletin 12 (1984), S. 93-98 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary New thermotropic Polyesters having mesogenic groups based on substituted hydroquinone units and highly flexible oligosiloxan spacer in the main chain, are synthesized and characterized. The mesophase formed at low temperature are studied by differential scanning calorimetry (DSC) and polarized light microscopy. The liquid crystalline behaviour of these polyesters, particulary their transition temperatures and the mesophase width could be explained on the basis of their structural features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258278
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