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  • Electronic Resource  (4)
  • 1975-1979  (4)
  • 1978  (4)
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  • Electronic Resource  (4)
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  • 1975-1979  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Thermal behavior of aryl-aliphatic polyamides (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 2857-2866 
    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: Low molecular weight poly(p-phenylene sebacamides) and (m-phenylene sebacamides) were prepared by interfacial polycondensation by varying the concentration of p-and m-phenylenediamine in the initial feed. The polymers were characterized by intrinsic viscosity measurement and IR spectra. The relative thermal stability was evaluated by differential thermal analysis and dynamic thermogravimetry in air and nitrogen atmospheres. A systematic dependence of stability on intrinsic viscosity of poly(m-phenylene sebacamide) was observed indicating an endgroup initiation of degradation. No such dependence was observed in poly(p-phenylene sebacamide). A probable mechanism for the thermal degradation has been proposed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070221012
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal degradation of poly(vinyl chloride) in the presence of additives - Part I (1978)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 71 (1978), S. 157-166 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Einfluß von Additiven (Maleinsäureanhydrid, p-Benzochinon, 9,10-Anthrachinon) auf die HCl-Abspaltungsgeschwindigkeit von PVC in Äthylbenzoat im Temperaturbereich zwischen 180° bis 210°C wird untersucht. Bei Temperaturen ab 200°C wird in Anwesenheit der Additive eine Verringerung der Geschwindigkeit beobachtet. Für diese Stabilisierung wird ein Mechanismus vorgeschlagen.
    Notes: The effect of additives (maleic anhydride, p-benzoquinone and 9,10-anthraquinone) on the rate of dehydrochlorination of PVC in ethyl benzoate was investigated at temperatures ranging from 180° to 210°C. A reduction in the rates was observed in presence of these additives at 200°C and above. A mechanism has been proposed to account for the stabilization effect.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1978.050710113
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal degradation of poly(vinyl chloride) in alkyl maleates (1978)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 66 (1978), S. 105-112 
    Details
    ISSN: 0003-3146
    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 thermische Abbau von Polyvinylchlorid uner Stickstoff in Diäthyl-Dibuyl- und Dioctylmaleat zwischen 160 und 210°C untersucht. Die Dehydrochlorierungsgeschwindigkeit ist in Dibutylmaleat am höchsten und in Dioctylmaleat am niedrigsten. Die aktivierungsenergie liegt bei 83,6, 122,7 und 150,5 kJ mol-1 für Diäthyl-Dibuyl- und Dioctylmaleat. Die Dehydrochlorierungsgeschwindigkeit und die Aktivierungsenergien liegen in Alkylmaleaten höher als in áthylbenzoat. In alkylmaleaten sind die Absorptionen im sichtbaren UV erheblich verringert.
    Notes: The thermal degradation of poly(vinyl chloride) has been investigated in diethyl, dibutyl and dioctyl maleate under nitrogen from 160°C to 210°C. The rate of dehydrochlorination was highest in dibutyl maleate and lowest in dioctyl maleate. The apparent activation energy calculated from the average value of the rate constant at each temperature for diethyl, dibutyl and dioctyl maleate was found to be 83.6 kJ mole-1, 112.7 kJ mole-1, and 150.5 kJ mole-1, respectively. The rates of dehydrochlorination and the activation energy observed in alkyl maleates are higher than those observed in ethyl benzoate. In the visible range spectra the absorption at higher wavelengths is considerably reduced in alkyl maleates.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1978.050660109
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Poly(1,3,4-oxadiazoles). Effect of structure on polymer properties (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 411-418 
    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: Poly(1,3,4-oxadiazole-2,5-diylvinylene) and poly(1,4-phenylene-1,3,4-oxadiazole-2,5-diylvinylene) were prepared by polymerizing different quantities of terephthalic acid (T), maleic acid (M), and hydrazine sulfate (HS) in the presence of fuming sulfuric acid. Homopolymers of M and T and various copolymers of M:T were prepared. The polymers were characterized by viscosity, IR, UV, and elemental analysis. Their solubility in different solvents was investigated. The relative thermal stability of the polymers was evaluated by TGA and DTA.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070220210
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    Paper (German National Licenses)
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