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Transformation of cubic symmetry for spherical microdomains from face‐centred to body‐centred cubic upon uniaxial elongation in an elastomeric triblock copolymer
Author(s) -
Imaizumi K.,
Ono T.,
Kota T.,
Okamoto S.,
Sakurai S.
Publication year - 2003
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889803008471
Subject(s) - copolymer , materials science , cubic crystal system , elongation , small angle x ray scattering , elastomer , scattering , crystallography , symmetry (geometry) , composite material , condensed matter physics , polymer , geometry , optics , chemistry , physics , mathematics , ultimate tensile strength
Experimental observation of the transformation of cubic symmetry from face‐centred cubic (f.c.c.) to body‐centred cubic (b.c.c.) for spherical microdomains upon uniaxial stretching of poly(1,3‐cyclohexadiene)‐ block ‐poly(ethylene‐co‐but‐1‐ene)‐ block ‐poly(1,3‐cyclohexadiene) triblock copolymer, having ϕ PCHD = 0.293, M n = 5.73 × 10 4 , M w / M n = 1.09, is reported. First, the sample was subjected to flow treatment at 493 K for 2 h; then it was annealed at 473 K for 2 h to prepare the f.c.c. structure. The sample was subsequently subjected to uniaxial stretching. After the load was completely removed, small‐angle X‐ray scattering measurements were conducted. It was found that the f.c.c. packing was transformed to the well ordered b.c.c. packing upon uniaxial stretching.