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首页> 美国政府科技报告 >Cure Characterization in Diamine-Cured Epoxy and Polyimide by UV ReflectionSpectroscopy
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Cure Characterization in Diamine-Cured Epoxy and Polyimide by UV ReflectionSpectroscopy

机译：紫外反射光谱法测定二胺固化环氧树脂和聚酰亚胺的固化特性

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UV specular reflection spectroscopy has been investigated for thecharacterization of cure reactions in an aromatic diamine cured epoxies and their composites, as well as in the imidization characterization of an aromatic polyamic acid. The UV reflection peak due to the reaction of the curing agent bis(p-aminophenyl) sulfone (DDS) with epoxide shows a red shift of about 24 nm in the spectral range of 300 nm to 350 nm. After the Kramers-Kronig conversion of the reflection spectra which is shifted to longer wavelength than the transmission spectra, the DDS peak occurs at a similar position as the transmission peak. The spectral shift obtained by three different techniques, UV reflection, UV transmission, and fluorescence excitation were similar as a function of cure time at 160 deg C. Therefore, the peak position in the reflection spectra may be used without the Kramers-Kronig conversion in order to correlate to the extent of cure, as established for the excitation spectral shift. The UV reflection spectral analysis is also obtained in DDS containing epoxy reinforced with glass or carbon fiber. Since the reflection probes only the flrst 0.5 micrometer layer of the resin, the presence of the fiber does not influence the spectral quality. jg.

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