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  • Articles: DFG German National Licenses  (15)
  • Polymer and Materials Science  (6)
  • Engineering General  (4)
  • cholesterol  (3)
  • Apolipoprotein B-100  (2)
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  • Articles: DFG German National Licenses  (15)
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  • 11
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 85 (1965), S. 273-279 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde der Versuch unternommen, das ungewöhnliche kinetische Verhalten der durch Butyllithium in Kohlenwasserstoffen als Lösungsmittel ausgelösten Copolymerisation von Butadien und Styrol experimentell zu analysieren. Dabei wurde festgestellt, daß die Reaktionsgeschwindigkeit von Styrol mit Polybutadienyllithium mit und ohne Butadien dieselbe ist und daß sich die Reaktion von Butadien mit Polystyryllithium durch eine sehr große Geschwindigkeit auszeichnet. Der kinetische Verlauf der Copolymerisation kann durch Annahme von vier normalen bimolekularen Reaktionsschritten erklärt werden. Es ist nicht nötig, eine bevorzugte Absorption an den Reaktionszentren anzunehmen, um den anfänglich großen Gehalt von Butadien im Copolymeren zu erklären.
    Notes: An attempt has been made to analyse experimentally the unusual copolymerization of butadiene with styrene initiated by Butyllithium in hydrocarbon solvents. The rates of reaction of styrene with polybutadienyllithium have been measured in both the presence and absence of butadiene, and found to be the same. The reaction of butadiene with polystyryllithium is found to be extremely fast. It is thought that the copolymerization can be explained in terms of four normal bimolecular reactions. No recourse has to be taken to preferential absorption at the reaction centre to explain the initial high butadiene content of the copolymer.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 82 (1965), S. 53-59 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Kondensation von Triphenylamin mit Bissäurechloriden gab mit Zinkchlorid bei 25°C oder mit Aluminiumchlorid bei 5°C lösliche, lineare Polymere. Phosgen, Thionylchlorid und Dichlormethan kondensierten mit Triphenylamin ebenfalls zu Polymeren. Die Substitution in p-Stellung erfolgte nur an zwei Phenylresten bei Verwendung von ZnCl2. Die Substitution am dritten Phenylrest in Gegenwart von AlCl3 führte zu vernetzten Polymeren, was durch Änderung der Bedingungen vermeidbar war.
    Notes: Linear, soluble polymers were prepared by condensing triphenylamine with diacid chlorides in the presence of zinc chloride at 25°C. or aluminum chloride at 5°C. Polymers were also obtained from condensations of phosgene, thionyl chloride, and dichloromethane with triphenylamine. Substitution occurred in the para-position on only two of the phenyl rings when zinc chloride was used. Substitution on the third ring which resulted in cross-linked polymers occurred in the presence of aluminum chloride but was avoided by modifying the conditions.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 9 (1989), S. 151-165 
    ISSN: 0271-2091
    Keywords: Numerical analysis ; Fluid flow ; Rotating circular duct ; Finite cell method ; Finite element method ; Swirl ; Inlet boundary conditions ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A numerical analysis of the flow pattern in the inlet region of a circular pipe rotating steadily about an axis parallel to its own is presented. Both finite cell and finite element methods are used to analyse the problem and they give qualitatively similar results which show that a swirling fluid motion is induced in the pipe inlet region. The analyses show that the direction of swirl is opposite to that of the pipe rotation when viewed along the flow axis and that its magnitude depends on the speed of pipe rotation and throughflow Reynolds number. Neither numerical analysis predicts the marked upturn in friction factor (or pressure drop) which has been observed experimentally. However, a dependence on the pipe inlet boundary conditions is demonstrated.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 23 (1996), S. 1241-1262 
    ISSN: 0271-2091
    Keywords: axisymmetric flow ; vortex method ; laminar flow ; entrance length ; steady and oscillating flows ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Steady and oscillating axisymmetric tube flows are modelled using a vorticity transport algorithm. The axisymmetric convective -diffusive Navier-Stokes equations are solved using a splitting technique. Axisymmetric ring vortex filaments are introduced on the walls and subsequently convected and diffused throughout the flow field. An axisymmetric equation similar to the Oseen diffusion equation is used to diffuse the ring vortex filaments. Vorticity is reflected from the tube walls using two techniques. Results are presented for the developing Poiseuille flow and for the developed flow in the form of the entrance length and the axial velocity and vorticity profiles. Good agreement is achieved with a finite difference method in the developing region of Poiseuille flow. The developed flow results are compared with the analytical solutions. The developed profiles of velocity and vorticity have errors of less than 0ċ3 per cent for both methods of dealing with reflection of diffusion at the bounding surfaces and similar accuracy is obtained for the velocity profiles in oscillating flow except at the wall. Oscillating flow is produced with a discretized sinusoidal piston motion. Velocity profiles, boundary layer thickness and entrance length are presented for oscillating flow. Good agreement is achieved for low-Womersley-number non-dimensional frequency. At higher values of this parameter, flows are inaccurately simulated, because the number of piston positions used to discretize the piston motion is inversely proportional to the non-dimensional frequency.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 449-455 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A kinetic study has been made of the polymerization of butadiene and styrene in an aliphatic hydrocarbon solvent with the use of butyllithium as an initiator. It is shown that the anomalous behavior in the initiation reaction exhibited by isoprene under these conditions is also found for these two monomers. These monomers give a sigmoidal rate curve in the initiation reaction in cyclohexane solution, and the reaction appears to be auto-catalytic. The propagation reactions were studied also, and the results compared with the rather discordant sets of data published by other authors.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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