Characterization of Acetylene-Terminated Resin Cure States
Interim technical rept. 3 Mar 1981-31 May 1983
MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO
Pagination or Media Count:
Acetylene-terminated oligomers are being considered for use in high- service-temperature adhesives and composites. It is thought that these resins cure via numerous pathways to produce different chemical structures such that the properties of the cured resin may be a strong function of the time- temperature cure schedule. Fourier transform infrared FT IR, nuclear magnetic resonance NMR, and electron paramagnetic resonance EPR experiments were performed to characterize the cure states of 4,4-bis3-ethynylphenoxydiphenyl- sulfone ATS. Measurements were performed at selected times during isothermal cures at 403K, 423K, and 453K. Independent cure-state parameters were derived from IR absorbance changes, IR frequency shifts, H1 NMR relaxation times, C13 NMR magic-angle spinning spectral areas, and EPR-determined concentrations of free radicals produced during polymerization. Preliminary postcure studies were performed. Originator-supplied keywords include Acetylene-terminated sulfone ATS.
- Manufacturing and Industrial Engineering and Control of Production Systems