AbstractMethyl methacrylate–styrene–acrylonitrile copolymers, alone and with polybutadiene modification, were examined for changes in impact strength and yellowness after thermal and light aging. The copolymer displayed no change in strength or clarity, while the butadiene‐modified material showed increase in yellowness and loss in impact resistance. It is apparent that these changes are primarily due to the decomposition of the butadiene phase in the impact material, and this conclusion might be applied to diene‐containing blends in
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