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  • Wiley-Blackwell  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and curing of poly(styrylpyridine)s. Structural study on models and on the resins, 1. Thermal behaviour of low-molecular-weight styrylpyridines (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 47-65 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It could be shown that the structure of poly(styrylpyridine)s (PSP), which are heat resistant thermosetting resins resulting from the polycondensation of 2,4,6-trimethylpyridine (1) with terephtalaldehyde (2), is much more complicated than that expected from this polycondensation. 2-Styrylpyridines were synthesized from benezaldehyde (5) and 2-methylpyridines and the stability of the respective intermediate alcohol was studied. The thermal behaviour of the styrylpyridines alone or in the presence of their precursors was studied by GPC, IR and NMR spectroscopy and by chemical analyses. It could be shown that the methyl group of 2-methylpyridine (4) adds reversibly to the double bond of 2-styrylpyridine (7) to form 2-phenyl-1,3-bis-(2-pyridyl)propane (8). This side reaction takes place also in the case of the condensation of 1 with 5. The structures and the reactivity of the condensation products of 1 with 1,2 or 3 molecules of 5 (compounds 14, 17 and 18) were studied. The condensation product 19, a component of PSP resins, was synthesized from 1 and 2 and its reactivity was studied at 200 and 250°C and compared with the non-methylated derivative 1,4-bis[2-(2-pyridyl)vinyl]benzene (25). The results of a preliminary analysis of the reactions taking place during the PSP thermosetting are reported.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880105
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and curing of poly(styrylpyridine)s. Structural study on models and on the resins, 2.Part 1: cf.1. 1H and 13C NMR study of the models (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 67-82 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The structures of the compounds, resulting from the condensation of 2-methylpyridine, 2,6-dimethylpyridine and 2,4,6-trimethylpyridine with benzaldehyde and terephtalaldehyde, were confirmed by high field 1H and 13C NMR spectroscopy. Structural assignments were made based on the NMR spectra of the intermediate compounds, 4-[1-hydroxy-2-4,6-dimethyl-2-pyridyl-ethyl]benzaldehyde (5) and 4-[1-hydroxy-2-(6-methyl-2-pyridyl)ethyl]benzaldehyde (6), of the main reaction products 2-styrylpyridine (3) and 1,4-bis[2-(4,6-dimethyl-2-pyridyl)vinyl]-benzene (1), and of the side reaction product 2-phenyl-1,3-bis(2-pyridyl)propane (4) resulting from the addition of the methyl groups of 2-methylpyridine to the double bond of 3.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880106
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    Paper (German National Licenses)
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