Abstract
Time-of-flight secondary ion mass spectrometry (TOF-SIMS) has been used to study one of the abid-terminated butadiene-acrylonitrile copolymers used as toughening agents in adhesive formulations. The capping reaction with diglycidyl ethers of bisphenol-A (DGEBA) was also investigated. At low mass, the positive-ion spectrum of the toughening agent was characterized by the radical butadiene monomer cation; at high mass, the parent ions of an antioxidant in the copolymer dominated the positive- and negative-ion spectra. Purification of the polymer using gel filtration chromatography resulted in little change in the spectra, apart from the total removal of the antioxidant parent ions and associated signals. Spectra containing peaks from a range of cationized oligomers were obtained by depositing sub-monolayer films of the copolymer on silver. The capping reaction resulted in the formation of mono- and di-DGEBA substituted oligomers. The antioxidant also reacted with DGEBA to form the mono- and di-substituted compounds.
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