Fraunhofer-Institut für Zuverlässigkeit und Mikrointegration IZM

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  • Publication
    Formation of new thermosets by the reaction of cyanates with thiophenols
    ( 2008)
    Bauer, M.
    ;
    Bauer, J.
    Sulfur-containing aromatic thermosets, mainly consisting of aryloxy- and arylthio-substituted 1,3,5-triazines, have been prepared through the reaction of difunctional cyanates with mono- and difunctional aromatic thiols. A straightforward three-step reaction scheme is proposed and verified by the identification of key substances: (1) the addition of thiol and cyanate groups, (2) the stepwise addition of (thio)imino carbonic esters with one another, and (3) the ring closure of chain-extended (thio)imino carbonic esters to form 1,3,5-triazines. Reactions of types 2 and 3 are associated with an abstraction of phenol or thiophenol, which can enter into reaction 1 again. Characterization Of the curing behavior of dicyanate of bisphenol A with thiophenol as well as dimercaptodiphenyl sulfide by differential scanning calorimetry shows that the reaction rates are significantly enhanced by the admixture of thiols to the cyanate. Dynamic mechanical analysis of resulting thermosets showed that large amounts of comonomers can be incorporated into the network resulting in a decrease of glass temperature but increase of fracture toughness. Finally, the fully cured thermosets resulting front the reaction of dicyanate of bisphenol A with different admixtures of dimercaptodiphenyl sulfide were characterized by cone calorimetry to get information about flame retardancy. The flame retardancy is influenced by incorporation of dimercaptodiphenyl sulfide into the triazine network only slightly. .
  • Publication
    Application of variable-temperature ellipsometry to plasma polymers: The effect of addition of 1,7-octadiene to plasma deposits of acrylic-acid
    ( 2000)
    Haddow, D.B.
    ;
    Goruppa, A.
    ;
    Whittle, J.
    ;
    Short, R.D.
    ;
    Kahle, O.
    ;
    Uhlig, C.
    ;
    Bauer, M.
  • Publication
    Polycyanurates. Innovative structural and functional materials
    ( 1997)
    Bauer, M.
    ;
    Bauer, J.
    ;
    Uhlig, C.
    A review with 12 refs.; polycyanurates are a young but well-developed group of high-temp. thermosetting polymers. Their rapid development during the last decade was primarily stimulated by the emerging requirements in aerospace and microelectronics applications, which cannot be met by common thermosets, e.g. epoxies. Some of the main reasons for the growing acceptance of polycyanurates as innovative structural and functional materials are: approved epoxy technologies can be used for handling and curing of the precursors (cyanate ester resins), no admixing of extra hardener is necessary; because the resin is self-hardening, the processing characteristics can be adjusted with a wide range of common catalysts, and, depending on the type of the backbone structure (cyanate ester monomer), a unique range of properties can be achieved including glass temps. up to 400 .degree.C, high toughness compared to other high-Tg thermosets, low dielec. losses, low inherent flammability, low optical damp ing, high chem. resistance and low corrosion potential. Finally, the range and combination of properties can easily be widened by copolymn. of cyanate esters with a variety of other reactive compds.
  • Publication
    Polycyanurates. Innovative Thermosets
    ( 1997)
    Bauer, M.
    ;
    Bauer, J.
    ;
    Uhlig, C.
  • Publication
    Epoxy-siloxane modified polycyanurate networks. Innovative structural and functional materials
    ( 1997)
    Bauer, J.
    ;
    Meyer, G.
    ;
    Brandl, O.
    ;
    Uhlig, C.
    ;
    Bauer, M.
  • Publication
    Novel low-loss and thermostable polymers for application in integrated optics
    ( 1997)
    Keil, N.
    ;
    Yao, H.
    ;
    Zawadzki, C.
    ;
    Bauer, M.
    ;
    Uhlig, C.
  • Publication
  • Publication
    Networks from dicyanates and phenols
    ( 1994)
    Bauer, J.
    ;
    Alla, C.
    ;
    Jährig, S.
    ;
    Bauer, M.