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  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    2,2 bis (4-ethynylphenyl) hexafluoropropane (1990)
    Springer
    Polymer bulletin 23 (1990), S. 7-12 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The 2,2 bis(4-ethynylphenyl)hexafluoropropane is prepared via an original synthesis's process using a substitution of 2,2 bis(4-triflatephenyl) hexafluoropropane by trimethylsilyl acetylene. In this process ZnO is used to remove the triflate anion formed during the reaction. This diacetylenic compound melts at 37–38°C, exhibits an onset of polymerization at 120°C. After thermal treatment at 250°C, the obtained network shows a softening point at 300°C. This network remains stable in air up to 435°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983957
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  • 2
    Electronic Resource
    Electronic Resource
    Diethynyl terminated siloxane bases (bisazomethine Schiff base) (1990)
    Springer
    Polymer bulletin 23 (1990), S. 439-445 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Bis-4 ethynylbenziminopropyl-hexamethyldisiloxane was prepared and characterized. The flexible central unit of this product allows an easy and thorough polymerization of the ethynyl groups at a moderate temperature. After thermal polymerization of the ethynyl groups, another reaction takes placeupon curing, leading to a product presenting no detectable Tg. This increase in crosslinking could be related to a diene synthesis involving both olefinic and imine double bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294875
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  • 3
    Electronic Resource
    Electronic Resource
    Acetylene-terminated amide oligomers (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 953-962 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Six new acetylene-terminated (AT) oligomers were synthesized by reaction of 3-ethynylbenzoyl chloride and 4-ethynylbenzoyl chloride with three aromatic diamines containing four aromatic rings. The functionalization led quantitatively to AT oligomeric diamides of well defined composition, as confirmed by IR, 1H NMR and 13C NMR spectroscopy. The materials exhibited comparatively high melting points, over 200°C; thus, heating promoted curing before melting or simultaneously with melting, with the only exception of one sample that could be isolated in the amorphous state. Heating at 325°C led to insoluble cured materials, with excellent thermal resistance and glass transition temperatures Tg around 300°C.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940318
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