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A versatile scheme to produce a multiple aromatic ether-linked phthalonitrile has been developed and applied to the preparation of two unique resin systems. The oligomeric phthalonitrile monomer was prepared from the reaction of an excess amount of bisphenol A or bisphenol A6F with 1,3-dibromobenzene in the presence of K2CO3 as the base in a N,N-dimethylformamide/toluene solvent mixture, followed...
A series of multiple aromatic ether-linked phthalonitrile resins containing an aromatic ether phosphine oxide group in the backbone have been synthesized and characterized. The oligomeric phthalonitrile monomers were prepared from the reaction of an excess amount of either bisphenol A or resorcinol with bis(4-fluorophenyl)phenylphosphine oxide in the presence of K 2 CO 3 in a N,N-dimethylformamide/toluene...
Binary blends of biphenyl phthalonitrile and the n=4 oligomeric phthalonitrile were prepared and characterized by differential scanning calorimetry and rheology studies. The blended phthalonitriles also were polymerized from the melt in the presence of bis[4-(4-aminophenoxy)phenyl]sulfone and the dynamic mechanical and thermal properties of the resulting copolymers were investigated. The properties...
A multiple aromatic ether-containing cyanate ester resin system with high thermal stability and superb processability has been developed. The oligomeric monomer was prepared via a hydroxyl-terminated intermediate synthesized from a modified Ullmann synthesis with bisphenol A and 1,3-dibromobenzene in the presence of potassium carbonate and a catalytic amount of a copper (I) complex in N,N-dimethylformamide...
Resorcinol-based phthalonitrile, 1,3-bis(3,4-dicyanophenoxy)benzene, has been synthesized in high yield by a simple nucleophilic displacement of a nitro-substituent from 4-nitrophthalonitrile in a dipolar aprotic solvent. The monomer can be thermally polymerized to a network polymer in the presence of an amine curing additive. The resin is readily processed in a controlled manner as a function of...
A miniature surface acoustic wave (SAW) chemical sensor has been utilized to monitor the progression and breakthrough of the nerve agent simulant dimethylmethylphosphonate (DMMP) through a porous carbon filter-bed. The SAW sensor was successfully operated in carbon filter-beds under high air flow rates and a variety of humidity conditions with no active temperature control applied to the filter bed...
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