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Dynamic mechanical properties of polystyrene-based block copolymers blended with poly(2,6-dimethyl-1,4-phenylene oxide)

✍ Scribed by Cécile Mazard; Lazhar Benyahia; Jean-François Tassin

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
212 KB
Volume
52
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

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

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