Abstract
Many complex polymer systems are composed of precise proportions of reactive monomers and partly reacted polymers with large variations in molecular weight in order to obtain the desired consistency for processing. The monomers are often relatively volatile and can evaporate during storage, while the partly reacted polymers can further polymerize when exposed to light or air. Therefore, methods must be available to analyse resin mixtures containing components with large variations in molecular weights and volatilities. The present report shows that gas chromatography combined with infrared detection can be used to accurately monitor and identify the volatile components while steric exclusion chromatography combined with infrared detection can provide structural information on the nonvolatile prepolymers. The combination of techniques has been used successfully to monitor aging in acrylic structural adhesives.
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