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Relationship between nanostructure and deformation behavior of microphase‐separated styrene/butadiene systems
Author(s) -
Adhikari Rameshwar,
Lebek Werner,
Godehardt Reinhold,
Michler Goerg H.,
Esperanza Cagiao M.,
Baltá Calleja Francisco J.,
Knoll Konrad
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22796
Subject(s) - materials science , copolymer , morphology (biology) , molar mass , composite material , nanostructure , nanometre , ultimate tensile strength , deformation (meteorology) , polymer , polymer blend , phase (matter) , styrene , nanoscopic scale , indentation hardness , polymer chemistry , microstructure , nanotechnology , chemistry , organic chemistry , genetics , biology
The relationship between the morphology and the mechanical properties of nanostructured blends, comprising an asymmetric styrene/butadiene star block copolymer, exhibiting cocontinuous‐like morphology and low molar mass homopolymers, was studied by electron microscopy, microindentation hardness, and tensile testing methods. Results show that the deformation behavior of these systems is significantly modified by the presence of unentangled homopolymer chains, leading partly to a decrease in mechanical properties. In contrast to common polymer blends, in which usually, the hardness values do not markedly deviate from the additivity law, the H ‐values in the system investigated show large deviations from the linear additivity behavior. The observed anomalous behavior is discussed in terms of the enhanced local flow processes induced by the phase‐separated morphology at a nanometer scale. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 998–1006, 2006