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Dynamic mechanical properties of polystyrene‐based block copolymers blended with poly(2,6‐dimethyl‐1,4‐phenylene oxide)
Author(s) -
Mazard Cécile,
Benyahia Lazhar,
Tassin JeanFrançois
Publication year - 2003
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1073
Subject(s) - materials science , polystyrene , copolymer , thermoplastic elastomer , phenylene , dynamic mechanical analysis , elastomer , polymer , glass transition , polymer chemistry , ethylene oxide , composite material , phase (matter) , oxide , organic chemistry , chemistry , metallurgy
The dynamic mechanical properties of a model system consisting of a styrene–butadiene (SB) symmetric block copolymer blended with poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) have been studied. It is shown that PPO is effectively incorporated in the rigid domains of the material but that the distribution of the homopolymer is not strictly uniform inside the polystyrene lamellae. The time–temperature superposition in these blends is discussed. Similar experiments were carried out on industrial compounds based on a polystyrene‐ block ‐poly(ethylene–butylene)‐ block ‐polystyrene thermoplastic elastomer and prepared in a twin screw extruder. Mechanical measurements indicate incorporation of PPO in the polystyrene phase but also a relaxation of the modulus at temperatures below the glass transition of the rigid phase. This is interpreted in terms of broad interfaces in which hard and soft segments of the polymer chains are mixed. © 2003 Society of Chemical Industry