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  • 1
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Macromolecules 3 (1970), S. 327-332 
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Journal of thermal analysis and calorimetry 11 (1977), S. 423-430 
    ISSN: 1572-8943
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Résumé Application de la nouvelle technique d'analyse des particules organiques à l'étude des réactions de décomposition thermique de divers types de composés organiques (par ex. les acétylacétonates métalliques, les isocyanates bloqués, les alkyldithiocarbamates métalliques, les acides arénosulfoniques et leurs sels aminés). A quelques exceptions près, la plupart des composés de ces différentes classes montrent de fortes caractéristiques d'organoparticulation aux températures inférieures à 200°, qui se manifestent par leur influence sur le courant de sortie d'un détecteur à chambre d'ions. Il n'a pas été possible, en général, de mettre en évidence une corrélation directe entre les températures de fusion et de décomposition et les intervalles des températures de l'organoparticulation des composés. Dans plusieurs cas, les valeurs de l'intervalle des températures d'organoparticulation étaient nettement supérieures ou nettement inférieures au point de fusion connu et aux températures de décomposition des composés. Afin d'expliquer les propriétés d'organoparticulation de ces composés, l'association en phase vapeur de molécules polaires (par ex. les phénols, les amines, les acides carboxyliques, etc.) semble être nécessaire pour donner des organoparticules de grandeur décelable par les instruments actuels. Une autre possibilité serait la formation d'une suspension “aérosol” de molécules organiques dans des gaz comme SO2, CS2, CO2, qui pourrait se produire avec quelques-uns de ces composés.
    Kurzfassung: Zusammenfassung Die neue Technik der organischen Partikelanalyse wurde zur Untersuchung der thermischen Zersetzungsreaktionen verschiedener Typen organischer Verbindungen (z. B. Metall-Acetylacetonate, blockierte Isocyanate, Metall-Alkyldithiocarbamate, Arensulfonsäuren und ihre Aminsalze) eingesetzt. Mit einigen Ausnahmen weist der Grossteil dieser Verbindungsklassen starke, bei Temperaturen unter 200ℴ organische Partikelcharakteristika auf, wie an Hand ihrer Wirkung auf den austretenden Strom eines Ionenkammerdetektors nachgewiesen werden kann. Im Allgemeinen konnte kein direkter Zusammenhang zwischen den Schmelz- und Zersetzungstemperaturen und den Temperaturbereichen der Organopartikulierung der Verbindungen festgestellt werden. In mehreren Fällen lagen die Temperaturbereiche der Organopartikulierung deutlich oberhalb oder unterhalb des bekannten Schmelzpunktes und der Zersetzungstemperaturen der Verbindungen. Um die organopartikulierenden Eigenschaften dieser Verbindungen zu erklären, scheint eine Dampfphasenassoziierung polarer Moleküle (wie z. B. Phenole, Amine, Carbonsäuren, usw.) nötig um mit der derzeitigen Instrumentierung nachweisbare Partikelgrössen zu ergeben. Als andere Möglichkeit könnte die Bildung einer “Aerosol”-Suspension organischer Moleküle in Gasen (wie z. B. SO2, CS2, CO2) bei einigen dieser Verbindungen gesehen werden.
    Notizen: Abstract The new technique of organoparticulate analysis has been used to investigate the thermal decomposition reactions of various types of organic compounds (i.e., metal acetylacetonates, blocked isocyanates, metal alkyldithiocarbamates, arenesulfonic acids and their amine salts). With a few exceptions, most of the compounds in these classes exhibit strong organoparticulation characteristics at temperatures below 200° as indicated by their influence on the output current of an ion chamber detector. In general, no direct correlation between the melting and decomposition temperatures and their organoparticulation temperature ranges was evident. In several instances, the organoparticulation temperature range values lay well above or well beneath the known melting point and decomposition temperatures of the compounds. To explain the organoparticulating properties of these compounds, vapor phase association of polar molecules (such as phenols, amines, carboxylic acids, etc.) would appear to be necessary to give organoparticulate sizes detectable with the present instrumentation. Alternatively, the formation of an “aerosol” suspension of organic molecules in gases, such as SO2, CS2, CO2, might be occurring with some of these compounds.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 2 (1962), S. 106-107 
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 21 (1977), S. 1383-1394 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The preparation and properties of sodium carbonate and sodium hydroxide-catalyzed phenolic resins polymerized in 1-liter glass reactors over a broad range of F/P mole ratios are described. Laminates produced from selected sodium carbonate-catalyzed resins coated on kraft paper are discussed and compared with laminates prepared from standard sodium hydroxide-catalyzed resins. Several apparent advantages of the sodium carbonate-catalyzed resin systems over the sodium hydroxide-catalyzed resins are presented. The superior performance is attributed to the high degree of crosslinking resulting from the high concentration of methylolated phenols present in the sodium carbonate-catalyzed resin.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 559-571 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: In a previous paper1 the development of neoprene formulations and mechanical designs to meet operational requirements for the Poseidon launch tube liner pads were presented. Subsequently, it was found that early development pads aged for three months at room temperature were ∼10% stiffer than the vendor's qualification compression-deflection (C—D) test values. The increase was attributed to a combination of normal elastomer recovery and continued crosslinking due to the original low state of cure of the pads. A program was designed to study the effect of postcure time and temperature on C—D recovery, the effect of carbon black loading on the C—D recovery, and room temperature and accelerated aging at elevated temperature on these effects. Values of the molecular weight between crosslinks (M̄c) were determined experimentally to establish the state of cure. The results of these experiments are presented and discussed. Recommendations are given for reducing C—D variation by modifying carbon black loading and/or postcure conditions.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 15 (1971), S. 619-640 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Neoprene formulations and mechanical designs have been developed to meet special operational requirements for the Poseidon Missile Launch System liner. The liner supports the missile in an aligned position, provides shock mitigation, reacts properly with the missile during launch, and damps vibrations. Operational requirements include static and dynamic compressive stiffness, damping, and water drainability. A mechanical design was evolved that utilized notched, prebuckled struts as supporting members. Compression-deflection characteristics were modified by simultaneous changes in geometrical design and polymer formulation. A study of the effects of variations in polymer compounding and mechanical design on the compressive stiffness, rate sensitivity of the compression-deflection characteristics, and vibrational damping is described. Mold release agents and their role in successful production are discussed.
    Zusätzliches Material: 23 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 3543-3553 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: An analytical procedure for determining the antioxidant (i.e., Akroflex CD) content in neoprene rubber has been developed. The method is based on the infrared absorption analyses of chloroform extractables from the cured rubber at 1600 cm-1 and 1300 cm-1. Good agreement is found between these two independent sets of measurements. In an attempt to elucidate the antioxidant loss mechanism found with neoprene, thermal aging studies were carried out over the temperature range of 80°-200°C. Using the infrared analytical procedure, antioxidant loss rates at the different temperatures were established. The activation energy value (5.1 kcal/mole) for the loss rate as well as other aging data suggest that the antioxidant is lost by a diffusion mechanism.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 325-331 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A high load-bearing shock-mitigating phenolic foam was developed to meet specific compression-deflection and gas permeability requirements. It was required that the foam display an almost constant compressive stress within the limits of 50-68 psi at strains ranging from 10% to 60%. Furthermore, the foam had to possess a highly open-celled structure so that its resistance to gas flow would be minimal. These properties were obtained from a chemical formulation utilizing a combination of two phenolic resins, a phosphoric-sulfuric acid catalyst system, a surfactant combination that included both a hydrophilic and a lipophilic surfactant, and a fluorocarbon blowing agent.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 333-339 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The effects of reaction rate and density on the properties of the phenolic foam described in the first paper were studied. Process and formulation variables were examined through altering the basic chemical composition described below, in which all parts are by weight; phenolic resin two component intermediate, 200 parts; hydrophilic surfactant, 0.25 parts; lipophilic surfactant, 0.50 parts; fluorocarbon blowing agent, 12 parts; 47.5 wt % sulfuric acid, 25 parts; and 80 wt % phosphoric acid, 15 parts. Compressive stress values at 20% deflection were utilized for comparing the effects of the studied parameters on the load bearing cabability of the foam. Pressure drop of air flowing through the foam was employed as a measure of the permeability or breathability. Permeability load bearing functions were identified as a potential means for optimizing the relationship between breathability and compression-deflection characteristics. The overall effects of cell structure on the relationship between load bearing and density have been related in a qualitative manner.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 341-351 
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The effects of variations in the chemical composition and processing conditions of the series of phenolic foams described in the two previous papers were studied. Compressive stiffness and density increased with increasing concentrations of the acid catalysts, the slower reacting phenolic resin component, water, the lipophilic component of the surfactant system, and age of the phenolic resins. These properties decreased with increasing concentration of the fluorocarbon blowing agent and process temperature. The compressive stiffness and density increased to a maximum and then decreased with increasing concentrations of the hydrophilic surfactant. Permeability or “breathability” of the foam decreased with the hydrophilic surfactant at low concentrations and then became essentially independent of further increases of this component. Increasing concentrations of the lipophilic surfactant gave foam having greater breathability. In all other cases the permeability of the foam decreased as its density increased. Effects of the variations in processing and composition on the dependency of load bearing upon density, on relationships between permeability and density and permeability and compressive stiffness, and upon cell structures are also described.
    Zusätzliches Material: 21 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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