AbstractUniform dispersions of high‐molecular‐weight poly(dimethylsiloxane) (PDMS) in a matrix of poly(styrene‐co‐acrylonitrile) (SAN) are prepared where the degree of crosslinking in the elastomer and its extent of grafting to the SAN matrix are controlled. This gives an impact resistant plastic at ambient and low temperatures which is resistant to outdoor exposure. TheTgof PDMS is shown to be greatly reduced when grafted to the SAN matrix. Plots of impact resistance versus shift factoraTof the elastomer added for toughening coincide for PDMS and polybutadiene over a 150°C temperatu
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