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The use of multidetector size exclusion chromatography is described for studying oxidation in styrene‐isoprene‐styrene block copolymer films. It is shown that exposure of these films to atmospheric oxygen causes surface oxidation of the isoprene midblocks and that the antioxidant system used is incapable of preventing this. Higher temperature exposure initially merely accelerates the surface reaction but is followed after an induction period by severe bulk‐phase degradation. The implications of ambient temperature surface oxidation of SIS‐based pressure‐sensitive adhesives are discussed.
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Harrison et al. (1986) studied this question.
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