Synthesis and Thermomechanical Properties of New AT-Phenylene R Systems
Final rept. 1 Sep 1982-30 Nov 1983
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH
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A series of high molecular weight 550-700 amu range bis-phenol based acetylene terminated AT resins were synthesized by reacting four moles of 4,4dihalodiphenylsulfone chloro and fluoro with one mole of a bis-phenol 4,4-isopropylidinediphenol, 4,4-thiodiphenol, p,p-biphenol, and resorcinol were used, end-capping the resulting halo-terminated products with 4-m- hydroxyphenyl-2methyl-3butyn-2-ol, and caustically cleaving the terminal acetone protecting groups to give free ethynyl functionalities. This synthesis produces a mixture of monomer and oligomer AT-products which were separated by column chromatography. Structural characterization of the systems was based on elemental and spectrographic infrared and nuclear magnetic resonance 1H analyses. Pure AT-monomers and the monomeroligomer mixtures produced by the outlined stoichiometry were cured at 288 C 550 F for 8 h in air. Glass transition temperatures Tgs of the cured by thermomechanical analysis and uncured by differential scanning calorimetry AT-systems were measured. Thermo- oxidative stability of the resins was evaluated by isothermal aging ITA in air at 315 C 600 F for 200 h. Originator furnished keywords include Acetylene terminated Matrix resin and High molecular weight.
- Polymer Chemistry