Phthalonitrile resin

Laskoski, M., Domingues, D. D., and Keller, T. M. Processablc phthalonitrile resins with high-thermal and oxidative stability, Fire and Polymers IV Materials and Concepts for Hazard Prevention ACS Symposium Series 922, Ed. Wilkie, C. A. and Nelson, G. L., American Chemical Society, Washington, DC, 2005, pp. 378-390. 

Characterization of the Cure of Diether-Linked Phthalonitrile Resins... 

The results of the characterization of cured phthalonitrile resins are presented. This includes their thermal properties from thermal gravimetric analysis and differential scanning calorimetry, spectroscopic properties from the infra-red and nuclear magnetic resonance techniques, and mechanical properties from torsional pendulum analysis and fracture mechanics evaluation. 

Material. The detail of the synthesis of diether-linked phthalonitrile resins has been given in an earlier report (6). Briefly, a mixture of bisphenol, 4-nitrophthalonitrile and an excess amount of anhydrous potassium carbonate stirred in dry dimethyl sulfoxide resulted in phthalonitrile monomers ... 

The properties of a tetrafunctional epoxy (Narmco 5208), cured according to a manufacturer s suggested procedure, are also included in Table I for comparison. Although the cured phthalonitrile resins are only marginally tougher than the epoxy and comparable in stiffness, they offer higher use temperature (or Tg). The exceptional case was the bisphenol-A6F linked resin, which is extemely brittle and has a very low glass transition temperature. 

The US Naval Research Laboratory developed the phthalonitrile resins containg four nitrile groups that could be crosslinked to give polymers, which may be phthalocyanines. 

Method of synthesis. phthalonitrile resin is obtained by heating a phenol with a Keller, T M, US Patent 4,410,676,... 

Polymeric materials that are being studied for use at high temperatures include phthalonitrile resins and composites using these resins. In addition, polymers made from high-carbon-content acetylenic monomers have been prepared and studied, especially with respect to pyrolysis, and inorganic-organic hybrid polymers have been prepared, especially for conversion to ceramics. 

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