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Structure‐property relationships for thermoplastic block terpolymers containing poly(styrene‐ p ‐tert‐butylstyrene) copolymer end segments
Author(s) -
Chen John C.,
Fetters Lewis J.
Publication year - 1987
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760271706
Subject(s) - copolymer , materials science , polybutadiene , styrene , thermoplastic elastomer , viscoelasticity , thermoplastic , rheology , polymer chemistry , composite material , polymer
Terpolymers 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.