Spectroscopic Characterization of the Cured State of Acetylene-Terminated Resin
Final rept. 1 Apr 1982-31 Mar 1983
CASE WESTERN RESERVE UNIV CLEVELAND OHDEPT OF MACROMOLECULAR SCIENCE
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The acetylene-terminated resin, bis 4-3-ethynylphenoxyphenyl sulfone AT hs ben studied using Fourier transform infrared spectroscopy FT- IR and high resolution nuclear magnetic resonance spectroscopy of solids. Samples which were cured at different temperatures for various times were analyzed by FT-IR and the results interpreted using factor analysis. The analysis revealed that only two major components were involved in the curing mechanism, that is, only a single polymerization reaction occurred at low curing temperatures. The pure component spectra generated by the factor analysis procedure could be used to analyze the state of cure of the resin. The infrared spectrum of the polymer is consistent with a polydiene structure. The NMR results produced a similar structural result. The extent of cure of the AT resin as evidence by the disappearance of the acetylene carbon followed a similar path to the infrared results. Curve studies also focussed on the effect of high temperature post cures of the ATS resin. Structural changes were reflected by spectroscopic differences but the changes were small and precise assignments were not possible. Further model compound studies would allow a precise determination of the structural basis of these spectroscopic differences.
- Organic Chemistry
- Atomic and Molecular Physics and Spectroscopy