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  • Polymer and Materials Science  (2)
  • Wiley-Blackwell  (2)
  • 1985-1989  (2)
  • 1980-1984
  • 1985  (2)
Collection
Keywords
  • Polymer and Materials Science  (2)
  • Physics  (2)
Publisher
  • Wiley-Blackwell  (2)
Years
  • 1985-1989  (2)
  • 1980-1984
Year
  • 1
    Electronic Resource
    Electronic Resource
    Direct mass spectrometry of polymers. XIII.For Part XII see Ref. 6.. Thermal fragmentation processes in copoly-α-amino acids (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 23 (1985), S. 1731-1747 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal fragmentation processes in L-Proline - Sarcosine and in L-Proline - L-Alanine copolymers have been investigated by direct pyrolysis - mass spectrometry. The mass spectral data show that proline - sarcosine copolymers decompose in three steps, yielding cyclic oligomers. The first step is characterized by the presence of the Sar - Sar, Sar - Pro, and Pro - Pro cyclic dimers. In the second step the formation of several series of cyclic oligomers up to nonamers - decamers can be observed, while the third step of thermal decomposition process leads to the almost exclusive formation of Pro - Pro cyclic dimer. The proline - alanine copolymers, instead, show a single-step thermal degradation process leading to the formation both of cyclic oligomers and compounds with olefin and nitrile end-groups. Our results show that the thermal decompostion of alanine units is affected by the neighboring units along the polymer chain. Sarcosine units act as thermally labile probes, causing the selective thermal cleavage of the Pro - Sar copolymer.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.170230614
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  • 2
    Electronic Resource
    Electronic Resource
    Direct mass spectrometry of polymers. XII.For Part XI, see Ref. 1(c). Thermal fragmentation processes in poly-α-aminoacids (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 23 (1985), S. 1145-1161 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal fragmentation processes in poly-α-aminoacids have been investigated by direct pyrolysis-Mass Spectrometry. The mass spectral data show that the pyrolytic breakdown of polyglycine, polysarcosine, and polyproline leads to the formation of cyclic oligomers. Polyalanine, polyphenylalanine, and polytyrosine decompose yielding compounds with olefin and nitrile end-groups. Finally, in the case of poly-α-methylglutamate, the primary thermal process is the loss of methanol with consequent formation, along the polymer chain, of pyroglutamic units, which yield cyclic dimer as main pyrolysis product.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.170230419
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    Paper (German National Licenses)
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