Abstract
AbstractTerpolymers containing polybutadiene as a central segment and diblock or random copolymer terminal units of equimolar amounts of styrene and p‐tert‐butylstyrene have been synthesized and evaluated. The structure property relationships were examined by a combination of transmission electron microscopy (morphology), dynamic viscoelasticity measurements, and melt rheological evaluations. The presence of p‐tert‐butylstyrene was found to lead, under certain circumstances, to thermoplastic elastomers exhibiting good phase separation and mechanical properties at ambient temperature along with Newtonian melt viscosities at low shear rates at elevated temperatures. This latter behavior is in contrast with that exhibited by conventional poly(styrene‐diene‐styrene) triblock copolymers.
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