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Double Yielding in a Styrene/Butadiene Star Block Copolymer
Author(s) -
Adhikari Rameshwar,
Buschnakowski Matthias,
Henning Sven,
Goerlitz Sylvia,
Huy Trinh An,
Lebek Werner,
Godehardt Reinhold,
Michler Georg Hannes,
Lach Ralf,
Geiger Kalman,
Knoll Konrad
Publication year - 2004
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200300186
Subject(s) - copolymer , materials science , polybutadiene , polystyrene , star (game theory) , polymer , deformation (meteorology) , crystallinity , composite material , polymer chemistry , crazing , styrene , physics , astrophysics
Summary: The morphology and tensile deformation behaviour of a highly asymmetric styrene/butadiene star block copolymer (polystyrene (PS) content = 74%) containing random PS‐ co ‐PB (polybutadiene) copolymer as a rubbery phase were investigated. The existence of double yielding, similar to that observed in some semicrystalline polymers, was detected in this nanostructured amorphous polymer. The observed phenomenon may be correlated with two different micromechanical processes taking place at the initial stage of deformation.The stress‐strain curve of the star block copolymer prepared here (each curve represents a different method). The two yield points are clearly visible (labelled I and II).