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  • Polymer and Materials Science  (8)
  • Physics  (3)
  • SPACE VEHICLES  (3)
  • AUXILIARY SYSTEMS  (1)
  • 1975-1979
  • 1970-1974  (12)
  • 1965-1969
  • 1970  (12)
Collection
Publisher
Years
  • 1975-1979
  • 1970-1974  (12)
  • 1965-1969
Year
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 8 (1970), S. 805-808 
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 136 (1970), S. 23-45 
    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: 1-Isopropyliden-3a.4.7.7a-tetrahydroinden (I) liefert mit verschiedenen kationischen Katalysatoren in einem weiten Temperaturbereich ein Homopolymeres, und zwar werden amorphe Produkte mit mittleren Molekulargewichten zwischen 1000 und 17000 erhalten. Die IR-, NMR- und UV-Spektren beweisen, daß die Polymerisation unter 1.4-Öffnung des konjugierten Doppelbindungssystems verläuft. Ein α-Wert von 0,68 in der KUHN-MARK-HOUWINK-Gleichung und die Anwesenheit zweier Doppelbindungen pro Grundbaustein deuten auf eine lineare Struktur der Produkte.Das Katalysatorsystem (CH3)3CCl/(C2H5)2AlCl wurde besonders eingehend untersucht. Die besten Ergebnisse werden bei Molverhältnissen von (CH3)3CCl/(C2H5)2AlCl ≥ 3 erhalten. Während der Reaktion wird der Cokatalysator verbraucht. Toluol wird durch dieses Katalysatorsystem noch bei -78°C alkyliert. Die Polymerisationstemperatur hat keinen nachweisbaren Einfluß auf die Struktur der Polymeren. Aus der Abhängigkeit von log \documentclass{article}\pagestyle{empty}\begin{document}$$\overline {DP}$$\end{document} von 1/T wurde eine Aktivierungsenergie Eapp von -3,23 kcal/mol gefunden.Die Polymeren enthalten wenig Chlor. Wird Toluol als Lösungsmittel verwendet, dann enthalten die Produkte auch Spuren aromatischer Ringe. In keinem Fall jedoch konnten OH-Gruppen nachgewiesen werden. Diese Ergebnisse werden diskutiert, und zwar unter Berücksichtigung der Nukleophilie von (I) und der pKa-Werte der initiierenden Carboniumionen, die sich ausgehend von (I) formulieren lassen.
    Notes: By means of different cationic catalysts 1-isopropylidene-3a.4.7.7a-tetrahydroindene (I) can be homopolymerized in a wide range of temperatures.Amorphous polymers having \documentclass{article}\pagestyle{empty}\begin{document}$$\overline {MW}$$\end{document} in the range 1,000-17,000 were obtained. IR, NMR, and UV data indicate the 1.4-opening of the conjugated double bond system of (I). An α value of 0.68 in the KUHN-MARK-HOUWINK equation and the presence of two double bond for every repeating unit support the linear structure of the polymers obtained.The system Me3CCl/Et2AlCl was investigated. The co-catalyst was consumed during the polymerization. The best yields were observed for values of the molar ratio Me3CCl/Et2AlCl ≥ 3. A strong alkylating ability of this catalyst toward toluene was found even at -78°C. No substantial structural differences were observed in the polymers obtained at different temperatures. Eapp = -3.23 kcal/mole was calculated from the log \documentclass{article}\pagestyle{empty}\begin{document}$$\overline {DP}$$\end{document} vs. 1/T plot.Chlorine was found in the polymer; traces of aromatic rings were present when the polymerization was carried out in toluene; no hydroxyl groups were detected.The results obtained are discussed in terms of the nucleophilicity of (I) and of the pKa values of the initial carbonium ions derived from (I).
    Additional Material: 10 Ill.
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  • 3
    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: 1-Isopropyliden-3a.4.7.7a-tetrahydroinden (I) kann mit äthylen und Propylen durch anionisch-koordinative Vanadin-Katalysatoren terpolymerisiert und mit äthylen copolymerisiert werden. Für die Polymeren werden die IR-, NMR- und UV-spektroskopischen Daten sowie die Molekulargewichtsverteilungen mitgeteilt.Der Einbau von I verläuft hauptsächlich über die öffnung der Cyclohexendoppelbindung. Im allgemeinen beträgt der Gehalt an I weniger als 10 Mol-%.Versuche, Homopolymere von I und Copolymere aus Propylen und I mit diesem Katalysatortyp zu erhalten, waren ohne Erfolg.Mit radikalischen oder mit anionischen Katalysatoren konnte aus I kein festes Polymeres erhalten werden. Lediglich mit AIBN wurden Oligomere erhalten, die Isobuttersäurenitrilgruppen, gebunden an das System der konjugierten Doppelbindungen, enthielten. In flüssigem Ammoniak gelöst, reagiert K oder KNH2 mit I in äquimolekularen Mengen zu wachsartigen Produkten, die keine NH2-Gruppen enthalten. Mit K werden Dihydroderivate von I gebildet.Die Ergebnisse lassen sich durch die Annahme erklären, daß sich aus I stabilisierte Radikale und Anionen bilden, die nicht zum Wachstum befähigt sind.
    Notes: By means of vanadium based anionic coordinate catalysts 1-isopropylidene-3a.4.7.7a-tetrahydroindene (I) can be terpolymerized with ethylene and propylene and copolymerized with ethylene. IR, NMR, UV spectroscopic data, and mol. wt. distributions are reported for the polymers.The incorporation of I is predominantly by opening of the cyclohexene double bond. The content of I was generally less than 10 mole-%.Attempts to obtain homopolymers of I and copolymers of propylene and I with this type of catalyst were unsuccessfull.No solid polymer could be produced from I by free radical or anionic catalysts. With AIBN only oligomers were obtained which had cyanoisobutyric groups attached to the conjugated double bond system. K or KNH2 in ammonia solution react with I in equimolar ratios to give waxy products which do not contain NH2 groups. With K di-hydrogenated derivatives of I are formed.The results have been interpreted in terms of stabilized radicals and anions derived from I which are unable to propagate.
    Additional Material: 3 Ill.
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  • 4
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
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  • 5
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Tab.
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  • 6
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Slightly modified conventional techniques were successfully applied to prepare aliphatic benzoxazolediamines and the corresponding high molecular weight polyamides, which could be spun into excellent fibers. Compared to regular aliphatic polyamides, these products showed higher transition temperatures, improved thermal and light stability, and increased affinity for acid dyes. In addition - quite unexpectedly - these fibers were highly crystalline and oriented after drawing at elevated temperatures.
    Additional Material: 3 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 8 (1970), S. 1939-1948 
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The benzophenone-sensitized solution-phase photocycloaddition polymerization of N,N′-polymethylenebisdichloromaleimides has been investigated. It is shown that a polymer can be obtained by repeated 2π + 2π photocycloaddition process. The intrinsic viscosity of the products varies from 0.1 to 0.6 when the link between the two maleimide moieties contains more than six and simultaneously an uneven number of methylene units. The polymeric materials form transparent, flexible, noninflammable films and decompose at 310°C.
    Additional Material: 2 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 8 (1970), S. 2713-2716 
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new technique to determine the reactivity ratios for monomers is described. It is based on vapor-phase chromatography and can be used for any volatile monomer. A new simplified equation was deduced which permits the direct use of the retention times to obtain the pair r1r2. The method is suggested for use in determination of the molar ratios of the chemical units in the polymer chain, regardless of chemical composition or constitution. The simplicity of this technique allows its use for monomer-polymer systems composed of any number of volatile monomers. The validity of this method was checked by using the pair methyl methacrylate-styrene. This technique is also being applied to the study of kinetics in polymerizations, since it allows the measurements of several samples taken from a single experiment.
    Additional Material: 1 Tab.
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  • 9
    Publication Date: 2019-06-27
    Description: Thermal control system for space storable propellant module
    Keywords: SPACE VEHICLES
    Type: NASA-CR-110941 , TRW-14051-6004-T0-00
    Format: application/pdf
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  • 10
    Publication Date: 2019-06-27
    Description: Revised Lunar Module Ascent Stage Thermal Model handbook
    Keywords: SPACE VEHICLES
    Type: NASA-CR-108468 , REPT-350.22-REV
    Format: application/pdf
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