Acetylene Terminated Quinoxalines ATQ.
Final technical rept. Nov 74-Oct 75,
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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A series of acetylene terminated phenylquinoxaline oligomers have been prepared which cure by addition, without the evolution of volatiles. The synthesis utilized the novel terminal acetylene end-capping reagent, 3-3,4-diaminophenoxyphenyl acetylene. The end-capped oligomers were soluble 20-30 in low boiling organic solvents and exhibited a high degree of flow at their softening temperatures. Thermal analytical data obtained on the oligomers indicated initial softening in the vicinity of 160 C and a strong polymerization exotherm maximizing at 274 C. Cured samples 8 hrs at 280 C exhibited Tgs of approximately 320 C. Mass spectrometry-thermogravimetric analysis of the polymers demonstrated that no volatiles were emitted during cure, and that decomposition of the resins initiated at 465 C. Author
- Polymer Chemistry