Perkin-Elmer Analytical News FREQUENCY (CM')
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< 0.4 0.6 0.8 1.0 1.5 1 FIG.
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WAVELENGTH (MICRONS)
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perature was so high that thermal degradation began.The predominant changes in the spectrum were due to polymerization and isomerization of the trially! cyanurate.
The resins were mixtures of tnallyl cyanurate and an unsaturated polyester. With the exception of the band at about 10.1μ, the spectrum of the polyester changed very little during cure, at least until the tem
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WAVELENGTH 2 1 ?5'C — 20Q'C The early stages of polymerization may be followed by examination of the bands at 10.1,u and 10.7/i; the first, of hydrogen vibrations around the double bonds in both the polyester and TAC, the second being due
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(MICRONS)
to TAC unsaturation alone. Reversal of relative intensities of these bonds indicates a preferential polymerization of the polyester, while over all reduction in intensity indicates polymerization of some of the TAC.
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