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3D Nanometer‐Scale Study of Coexisting Bicontinuous Morphologies in a Block Copolymer/Homopolymer Blend
Author(s) -
Jinnai Hiroshi,
Hasegawa Hirokazu,
Nishikawa Yukihiro,
Sevink G. J. Agur,
Braunfeld Michael B.,
Agard David A.,
Spontak Richard J.
Publication year - 2006
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.200600344
Subject(s) - gyroid , copolymer , materials science , morphology (biology) , transmission electron microscopy , isoprene , nanometre , phase (matter) , polymer blend , polymer chemistry , chemical physics , nanotechnology , polymer , chemistry , composite material , organic chemistry , biology , genetics
Summary: Coexisting bicontinuous morphologies, one ordered and one disordered, are investigated in a macrophase‐separated poly(styrene‐ block ‐isoprene) diblock copolymer/homopolystyrene (SI/hS) blend. Two‐phase behavior is attributed to the relatively high hS/S mass ratio (0.92). According to its crystallographic signature and channel coordination as discerned from three‐dimensional (3D) images generated by transmission electron microtomography (TEMT), the ordered morphology is classified as gyroid. The 3D local and global topological characteristics of both bicontinuous morphologies as measured directly from TEMT images are reported. The disordered morphology is further compared with molecular‐field simulations to ascertain the spatial distribution of the constituent species within the blend, thereby demonstrating the utility of high‐resolution 3D imaging coupled with molecular‐level simulations.