Discussion
Weather resistance of high impact polystyrene can be improved by blending polystyrene with
Answer: C
Blend with ethylene propylene rubber.
Ordinary high impact polystyrene is toughened with polybutadiene-type rubber, whose backbone double bonds are attacked by oxygen, ozone and ultraviolet light, so the material yellows and embrittles outdoors. Ethylene propylene rubber has a saturated backbone with no such double bonds, so a polystyrene toughened with it keeps its impact strength on weathering.
Styrene butadiene rubber, natural rubber and nitrile rubber all contain backbone unsaturation from butadiene or isoprene, so they share the weakness that causes the problem.
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