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Transition Pathway between Gyroid and Cylindrical Morphology in Linear Triblock Terpolymer Thin Films
journal contribution
posted on 2019-08-22, 20:44 authored by Aynur Guliyeva, Marylène Vayer, Fabienne Warmont, Atsushi Takano, Yushu Matsushita, Christophe SinturelA new
transition between alternating gyroid (GA) structure and cylindrical morphology was observed in
thin films for a poly(isoprene-block-styrene-block-(2-vinylpyridine)) (ISP) triblock terpolymer (I/S/P
volume fraction = 0.20:0.66:0.14) exhibiting in bulk a Q214 (space group I4132) morphology.
Thin films were organized using solvent vapor annealing (SVA) and
characterized by atomic force microscopy, transmission electron microscopy,
and grazing-incidence small-angle X-ray scattering, coupled with several
selective revealing methods adapted to the ISP system. After a short
SVA time, the bulk morphology was reproduced with the (011) plane
parallel to the surface. With a longer annealing time, a P2mm structure with cylindrical polyisoprene (PI)
and poly(2-vinylpyridine) (P2VP) domains was obtained. Evidence of
domains in transition between gyroid and cylinders was found, suggesting
an epitaxial relationship between these two structures. In contrast
to the well-known double gyroid (GD) to
hexagonal (HEX) transition where {121} planes of the GD structure are epitaxially related to the {100} planes
of the HEX phase and cylinders grow along the ⟨111⟩
direction, we showed that the {011} planes of the GA phase become the {001} planes of the cylindrical structure
(P2mm) and the cylinders grow along
the ⟨010⟩ direction of the GA, parallel to the substrate. This was directly related to the three-dimensional
topology of the PI and P2VP networks.
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Keywords
bulk morphologyP 2 mm structureepitaxial relationshipSVA timeISP systemThin filmsTransition PathwayCylindrical MorphologyG D structuregrazing-incidence small-angle X-rayPItransitionP 2VP domainstriblock terpolymerP 2VP networksspace groupvapor annealingP 2 mmtransmission electron microscopyQ 214G DHEX phaseannealing timegyroidLinear Triblock Terpolymerforce microscopy
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