Abstract
AbstractRubber toughening of glassy polystyrene (PS) has been manufactured commercially for decades as high impact polystyrene, where rubbery poly‐butadiene (PB) inclusions are added to modify the PS matrix response to deformation and impact. In this study, measurements of the local glass transition temperature Tg(z) of PS next to PB rubber are presented, expanding the previous data to a polymer with a much lower Tg value (PB Tgbulk = −96 °C). After accounting for a small molecule additive present in the commercial PB sample that would otherwise migrate over to the PS domain causing plasticization, it is found that the Tg(z) profile in PS next to PB is consistent with previous results. It is also demonstrated that these broad and asymmetric experimentally observed Tg(z) profiles are not caused by the migration of low molecular weight chains across the interface by comparing samples made with two different poly(n‐butyl methacrylate) molecular weights.
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