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  • 1
    Electronic Resource
    Electronic Resource
    β-Propiolactone. XV. Use in the Diene Synthesis (1954)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 76 (1954), S. 609-609 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01631a087
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  • 2
    Electronic Resource
    Electronic Resource
    Polymerization of olefins on supported catalysts (1959)
    Springer
    Algebra universalis 1 (1959), S. 180-191 
    Details
    ISSN: 1420-8911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02283834
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Novel polymerization methods. Introduction (1962)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 2 (1962), S. 99-99 
    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: New methods, new structures leading to novel properties are presented in a collection of summaries. Areas discussed were: thiosemicarbazides, organometallic initiation of allene polymerization, poly(1,1,4,4,-tetramethyl-1,3-butadiene), emulsion polymerization of vinyl acetate with protein detergent solubilizing agents, alkali metal organic catalysts for stereospecific polymerization, anionic polymerization of dienes, rate constants in anionic polymerization, a series on polymerization by oxidative coupling with amine copper salt catalysts, block polymerization by vapor phase swelling, intra-intermolecular propagation in the solid-state and radiation induced polymerization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760020204
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  • 4
    Electronic Resource
    Electronic Resource
    Poly-β-hydroxybutyric acid - a naturally occurring thermoplastic material (1964)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 4 (1964), S. 245-250 
    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: Poly-β-hydroxybutyric acid has been isolated in quantities sufficient for characterization and evaluation of mechanical properties from both Bacillus megaterium and a special strain of Rhizobium. Its presence in a larger variety of bacteria than previously suspected has been demonstrated by a screening method based on density-gradient centrifugation. The intrinsic viscosity of the isolated polymer has been shown to depend on the technique of isolation; basic solvents facilitate hydrolytic cleavage of the polyester. Mechanical properties of the polymer are based on the high crystallinity and polarity of the material; in a highly crystallized state, it is quite brittle, but its rigidity exceeds that of polypropylene. Thermal degradation of molecular weight, due to beta-eliminatin of the carboxyl group from the polyester structure, severely limits processing of the polymer in the melt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760040403
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  • 5
    Electronic Resource
    Electronic Resource
    Crystalline titanium dichloride - an active catalyst in ethylene polymerization. I. Catalyst activation (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 743-754 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Crystalline titanium dichloride, in the absence of organometallic cocatalyst, is a very poor catalyst for the polymerization of ethylene. It is transformed into a very active catalyst through mechanical activation (ball-milling). This catalyst is active in the absence not only of organometallic cocatalysts, but also metals and compounds (such as aluminium and AlCl3) capable of forming organometallic compounds in situ (i.e., with ethylene, before polymerization starts). Ball-milling causes not only the expected increase in surface area but also disproportionation of Ti++ to Ti+++ and metallic titanium, as well as a crystal phase change to a structure not previously identified with those of TiCl2 or TiCl3. Catalyst activity (polymerization rate) is shown to be proportional to surface area and a direct function of Ti++ content of the catalyst; an empirical equation relates catalyst activity to surface area and to Ti++ lost through disproportionation. Titanium trichloride was found to be inactive in the absence of organometallic cocatalyst, even after ball-milling. The difference in structure of the catalytically active species in the conventional Ziegler (organometallic cocatalyst) and in the titanium dichloride catalyst are discussed. The mechanism of polymerization is compared with that of the supported (CrO3 on SiO2/Al2O3 and MoO3 on Al2O3) catalyst systems.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.150060403
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis and performance of fiber composites, B. D. Agarwal and L. J. Broutman, Wiley-Interscience, New York, 1980, 355 pp. Price: $24.50 (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 18 (1980), S. 689-690 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.130181011
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  • 7
    Electronic Resource
    Electronic Resource
    Crystalline titanium dichloride - an active catalyst in ethylene polymerization. II. Polymer structure, polymerization variables, and scope (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 755-762 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polymerization of ethylene with ball-milled titanium dichloride leads to a completely linear polymer with terminal unsaturation corresponding to approximately one carbon-carbon double bond per molecule. Polymerization rate is first-order in both monomer and catalyst concentration at 140°C. Due to a thermal deactivation of the catalyst, the polymerization rate falls sharply with temperature above 180°C. Propylene and butene-1 will copolymerization with ethylene in this system, propylene more efficiently than butene-1. Evidence for copolymerization of trans-2-butene, but not of the cis-isomer or of isobutene, in trace concentrations is presented. Propylene is homopolymerized to a product low in isotactic content. The significance of the structural and (limited) kinetic data in terms of the mechanism of polymerization are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.150060404
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