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  • Chemistry  (2,439)
  • AIRCRAFT  (234)
  • General Chemistry
  • Inorganic Chemistry
  • 1970-1974  (2,673)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The effect of solvent traces on the ultraviolet degradation of poly(vinyl chloride) (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 83-97 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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 ultraviolet degradation of poly(vinyl chloride) films was studied in a photoreactor which supplied energy near 3000 Å. It was noted that the rate of degradation and color development was increased when the level of residual solvent in the cast films was increased. Two solvents were employed in the study: tetrahydrofuran and dichloroethane. The amount of residual solvent was correlated with the height of a characteristic peak at 2800 Å for tetrahydrofuran and 1900 Å for dichloroethane. Films which had very small traces of solvent showed excellent resistance to ultraviolet degradation, even in the absence of ultraviolet stabilizers. The analysis of solubility data showed that chain scission was controlling in the early stages of exposure, while crosslinking was controlling at later stages. As a result, it was not possible to apply Charlesby's treatment of radiation-induced degradation. Comparison with the results obtained by other workers for degradation at 2537 Å showed that degradation at this wavelength was much faster than degradation at 3000 Å. Furthermore, degradation at 2537 Å appeared to be controlled by crosslinking at all stages of exposure.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070160108
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  • 2
    Electronic Resource
    Electronic Resource
    Reactions between diisopropyl methylphosphonate and halides of divalent metal ions (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 267-279 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metall(II) Halogenide reagieren mit Diisopropyl Methylphosphonat (DIMP) bei 150-220°C unter Bildung der folgende Komplexe: M[(C3H7O)CH3POO]2 (M = Fe, VO); M2[(C3H7O)CH3POO]2[OOP(CH3)-O-P(CH3)OO], (M = Ca, Mn, Co Ni); Zn[OOP(CH3)-O-P(CH3)OO]; Cu[CH3POO(OH)]3 (aus CuCl2 · 2 H2O + DIMP); Cu[CH3PO3] (aus CuX2 + DIMP; X = Cl, Br). Diese Komplexe wurden mittels Elektronen- und Infrarot-Spektren und magnetischen Messungen charakterisiert.
    Notes: Metal(II) halides react -with diisopropyl methylphosphonate (DIMP) at 150-220°C with formation of the following complexes: M[(C3H7O)CH3POO]2 (M = Fe, VO); M2[(C3H7O)CH3POO]2[OOP(CH3)-O-P(CH3)OO], (M = Ca, Mn, Co Ni); Zn[OOP(CH3)-O-P(CH3)OO]; Cu[CH3POO(OH)]3 (from CuCl2 · 2 H2O + DIMP); Cu[CH3PO3] (from CuX2 + DIMP; X = Cl, Br). These complexes were characterized by means of their electronic and infrared spectra and magnetic susceptibilities.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713840312
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  • 3
    Electronic Resource
    Electronic Resource
    Organophosphorus compounds. XXI. The Reaction of Alkyl Phosphites with 10-Methyleneanthrone and 10-Arylideneanthrones (1974)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 316 (1974), S. 377-385 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of triethyl and trimethyl phosphites with 10-methyleneanthrone 1a, 10-benzylideneanthrone 1b, 10-(p-chlorobenzylidene)anthrone 1c, 10-(p-methoxybenzylidene)anthrone 1d and 10-(diphenylmethylene)anthrone 1e, has been investigated. Depending on the experimental conditions, reaction of 1a with triethyl phosphite gives diethyl (10-ethoxy-9-anthryl)methylphosphonate 3a and/or the spiroanthrone 8a, whereas, with trimethyl phosphite, dimethyl [(9, 10-dihydro-10-oxo-9-anthryl)methyl]phosphonate 11a is formed. Compound 1b on reaction with trimethyl phosphite yields dimethyl [α-(9,10-dihydro-10-oxo-9-anthryl) benzyl]phosphonate 11b. Reaction of 1c with triethyl phosphite and trimethyl phosphite gives rise to diethyl [p-chloro-α-(10-ethoxy-9-anthryl)benzyl]phosphonate 3c and dimethyl [p-chloro-α-(9,10-dihydro-10-oxo-9-anthryl)benzyl]phosphonate 11c respectively. Compounds 1d and 1e did not react with alkyl phosphites.Possible reaction mechanisms are considered and the structural assignments are based on analytical and spectroscopic results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19743160305
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  • 4
    Electronic Resource
    Electronic Resource
    Reactions of Arylhydrazones of Some α-Cyanoketones with GRIGNARD Reagents (1972)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 314 (1972), S. 815-821 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The arylhydrazones of ethyl α-oxo-cyanoacetate 1a-e and the α-arylhydrazones of β-phenyl-α,β-diketopropionitrile 2a-e, react with GRIGNARD reagents at room temperature to yield the cyanocarbinols 3a-h. On the other hand, 1 and 2 react with phenylmagnesium bromide in refluxing ether-benzene mixture, to yield the imino derivatives 4a-d. 3a-e are dehydrated by hot acetic acid to yield compounds 5a-d. Similar treatment of 41-d affords the α-arylazo-β-phenylchalcones 6a-d which react with hydroxylamine to yield isoxazoline derivatives 7a-d.Treatment of 1b, d with ethereal diazomethane results in the formation of the N-methylarylhydrazones 8a, b.The arylhydrazono-malodinitriles 9 react with GRIGNARD reagents to yield the imino derivatives 10.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19723140515
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  • 5
    Electronic Resource
    Electronic Resource
    Über Pterinchemie. 33., vorläufige Mitteilung. Luftoxydation von 6,6-disubstituierten Tetrahydropterinen, ein Beitrag zur Frage der Existenz von Parachinoid-dihydropterinen (1970)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 1434-1436 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Luftoxydation von 6,6-disubstituierten Tetrahydropterinen führt nicht, wie vermutet, zu Parachinoid-dihydropterinen, sondern unter Verlust einer der beiden Seitenketten zu 7, 8-Dihydropterinen. Dieses Ergebnis wird im Zusammenhang mit der existierenden Theorie der Tetrahydropterin-Oxydation kurz diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19700530626
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  • 6
    Electronic Resource
    Electronic Resource
    The Structure of VincarodineVinca Alkaloids. XXXI. For part XXX see [1].Carbon-13 Nuclear Magnetic Resonance Spectroscopy of Naturally Occurring Substances XX. For part XIX see [2]. (1973)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 56 (1973), S. 2660-2666 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The structure of vincarodine has been determined to be 1 by an investigation of its IR.-, UV.-, 1H- and 13C-NMR.- and mass spectra. A 13C-NMR. analysis has been performed on the bases vincamine (2), epivincine (9), 14, 15-dehydrovincine (7) and its 16-epimer (8).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19730560749
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  • 7
    Electronic Resource
    Electronic Resource
    Solvent effects on radical copolymerization of methyl methacrylate and acrylonitrile (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 1531-1534 
    Details
    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 radikalische Copolymerisation von Methylmethacrylat und Acrylnitril wurde in sechs Lösungsmitteln bei zwei verschiedenen Ausgangs-Monomerverhältnissen und 60°C untersucht. Der Stickstoffgehalt der Copolymeren nimmt in der Reihe Chloroform 〈 Dioxan 〈 Benzol 〈 Anisol 〈 Methylpentylketon 〈 Brombenzol zu, was einen Einfluß der Lösungsmittel auf die wachsenden Radikale nahelegt.
    Notes: Radical copolymerization of methyl methacrylate and acrylonitrile has been studied in six solvents at 60°C, and two monomer feed ratios. The nitrogen contents of the copolymers increases in the order: chloroform 〈 dioxane 〈 benzene 〈 anisole 〈 methyl pentyl ketone 〈 bromobenzene, suggesting an influence of the solvent on the growing radicals.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750514
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  • 8
    Electronic Resource
    Electronic Resource
    Investigations of the structure of polyphenylenes based on ketone acetals by infrared spectroscopy (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 3475-3485 
    Details
    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 Struktur der durch Polycyclokondensation von Ketonacetalen aromatischer Acetylverbindungen dargestellten Polyphenylene wurde IR-spektroskopisch untersucht. Es konnte gezeigt werden, daß sich bei der Polycyclokondensation 1,3,5-substituierte Benzolringe bilden, die durch spezifische Absorptionsbanden bei 880 und 1 400 cm-1 charakterisiert werden. Die IR-Daten erlauben, die Anwesenheit von defektiven (d. h. nichtaromatischen) Fragmenten in den Polymerketten abzuschätzen.
    Notes: The structure of polyphenylenes obtained by polycyclocondensation of ketone acetals of aromatic acetyl compounds was investigated by IR spectroscopy. It could be shown that in the course of polycyclocondensation 1,3,5-substituted benzene rings are formed, which are characterized by the specific absorption bands at 880 and 1 400 cm-1. The spectral data permit the evaluation of defective (non-aromatic) fragments in the polymer chains.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021751213
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  • 9
    Electronic Resource
    Electronic Resource
    A cooperative molecular weight distribution test (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 269-282 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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 development of gel permeation chromatography (GPC) has provided a convenient tool for the rapid determination of molecular weight distribution. The question has arisen as to the suitability of the method for specification purposes. The present work, suggested by the Naval Air Systems Command, represents an attempt to assess the precision of the method through a series of tests carried out by a number of laboratories using identical procedures on the same samples. Ten laboratories agreed to take part. Naval Ordnance Station, Indian Head, worked out standard conditions for operation of the chromatograph, for calibration of the columns, and for analysis of the GPC curves. Two samples of polystyrene were used by the various organizations for calibration of their instruments. Number-average molecular weight, heterogeneity index, and cumulative molecular weight distribution curves were determined on four samples of carboxyl-terminated polybutadiene (CTPB) and two samples of hydroxyl-terminated polybutadiene (HTPB), all unidentified except by letter code. All laboratories used identical directions for setting up CTPB and HTPB calibration curves which were based on curves determined from vapor-pressure osmometer molecular weights and GPC count numbers of fractionated material. Variation among the different laboratories was 0.15 in heterogeneity index, and a maximum of 1200 in molecular weight provided one aberrant set of values was eliminated. The six samples had heterogeneity indices from 1.15 to 1.54, while molecular weight varied from approximately 3000 to 6000. The average coefficient of variation of the molecular weight values was 6.2 ± 0.7%, which is quite acceptable. Variation in heterogeneity index was too great for specification purposes when considered among the different laboratories, but may be sufficiently good when measured by any one laboratory.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170121
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  • 10
    Electronic Resource
    Electronic Resource
    A kinetic model for microbial growth on solid hydrocarbons (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 14 (1972), S. 61-73 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A kinetic model has been presented to explain the growth of microorganism on solid hydrocarbons. The model is based on the assumption that metabolite produced by the growing cells helps the dissolution of the solid substrate in the aqueous medium. The linear behavior of the growth curve predicted by the model is verified experimentally.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260140107
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