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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 9 (1979), S. 147-153 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Poly(4-vinyl pyridine-co-methyl methacrylate), which is soluble in water in its protonated form and insoluble as a neutral molecule, has been synthesized and introduced into an acid bath for copper deposition. Potential-sweep investigations have shown that the copolymer affects the electrocrystallization of copper on graphite by delaying nucleation even before conditions for codeposition of the polymer are reached. At overpotentials at which the diffusion limiting current of copper is reached and hydrogen evolution starts, alkalinity at the electrode surface causes precipitation of the polymer. This is found to affect the resistivity of the deposit. Electron microscopy revealed that under such conditions copper is deposited in the form of globular particles, the size of the globules being in the micron range and decreasing with increasing overpotential.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 15 (1979), S. 55-66 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On décrit une nouvelle technique pour étudier la formation de mousse dans les polymères fondus qui contiennent des agents de soufflage décomposables par voie thermique. On a associé un simple cylindre et un porte-échantillon d'immersion à un analyseur thermomécanique standard. Cela permet d'enregistrer la hauteur, c'est-à-dire le volume, en fonction du temps ou de la température, à des vitesses de montée en température présélectionnées. Des démonstrations avec du polyéthylène et du chlorure de polyvinyle plastifié pouvant mousser ont mis en évidence les influences respectives de la vitesse de chauffage, du type et de la concentration de l'agent de soufflage, de l'inhibiteur de l'agent de soufflage, de la viscosité du polymère et de l'agent de réticulation sur la vitesse de formation de la mousse et sur sa hauteur finale, c'est-à-dire la densité de la mousse.
    Abstract: Zusammenfassung Eine neue Technik zur Untersuchung der Schaumbildung aus Polymerschmelzen, welche thermisch zerstörbare Schaumbildner enthalten, wird beschrieben. Ein einfacher Zylinder und ein Tauchprobenbehälter wurden mit einem thermomechanischen Standardanalysator gekoppelt. Dies ermöglicht das Registrieren der Höhe, d.h. des Volumens als Funktion der Zeit oder Temperatur, bei vorgewählten Geschwindigkeiten für die Temperaturabtastung. Versuche mit schäumungsfähigem Polyäthylen und plastizisiertem Poly(Vinylchlorid) zeigten die Einflüsse der Aufheizgeschwindigkeit, des Typs und der Konzentration des Schaumbildners, des Inhibitors des Schaumbildners, der Viskosität von Polymer und Quervernetzer auf die Geschwindigkeit der Schaumbildung und auf die Endhöhe des Schaumes, d.h. die Schaumdichte.
    Notes: Abstract A novel technique is described for studying the growth of foam from polymer melts containing thermally-decomposable blowing agents. A simple cylinder and plunger sample holder has been combined with a standard thermomechanical analyzer. This enables the recording of height i.e. volume vs. time or temperature at preselected rates for temperature scan. Demonstrations with foamable polyethylene and plasticized poly(vinyl chloride) have revealed the influences of heating rate, blowing agent type and concentration, blowing agent inhibitor, polymer viscosity and crosslinking agent on foam growth rate and final foam height i.e. foam density.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 875-877 
    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: The rheological behavior of a sample of H-H polystyrene of Mn of 41,000 and a Mw/Mn of 2 was compared at 160 and 190°C with a sample of H-T atactic polystyrene of similar molecular weight. The melt viscosity of H-H polymer (unlike the H-T polymer) was non-Newtonian at low stresses and decreased more rapidly with stress. This observation seems to indicate a stiffer polymer chain for the H-H polystyrene. The flow activation energy (E*) of H-H polystyrene was found to be dependent on the dynamic shear stress and decreased with increasing dynamic shear stress. The dynamic shear storage modulus of the H-H polymer has a smaller increase of G′ with ω than that of the H-T polystyrene.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    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: Samples of chloral homopolymers and copolymers with aromatic isocyanates of high chloral content were prepared by cryotachensic polymerization as films of 0.1 to 5 mm thickness. Thermal, mechanical, and electrical properties of these polymers were measured. Polychloral is unlike most other linear polymers as it does not show any melting or glass transition below 220°C, at which temperature the polymer starts to degrade by depolymerization to monomer. The polymer is of moderate crystallinity and shows properties characteristic of engineering plastics.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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