Reinvestigation of the block copolymer modulated lamellar structure
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Reinvestigation of the block copolymer modulated lamellar structure. / Mortensen, Kell; Vigild, Martin Etchells.
In: Macromolecules, Vol. 42, No. 5, 2009, p. 1685–1690.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Reinvestigation of the block copolymer modulated lamellar structure
AU - Mortensen, Kell
AU - Vigild, Martin Etchells
PY - 2009
Y1 - 2009
N2 - We report extended crystallographic studies on shear-aligned block copolymer systems within the metastable modulated lamellae (ML) state. With studies limited to the "classical" orientations parallel and perpendicular to shear plane, the apparent modulated state would likely have been assigned simple lamellar. Surprisingly, upon rotating the sample to intermediate angles additional scattering reflections appear, which reveal the apparent ML phase much beyond what was expected. The modulated structure is a slightly distorted fcc structure. With the sample sheared at relatively low temperature, presumably below the stable gyroid phase, we find a very well resolved ML texture corresponding to a simple twin structure of the distorted fcc structure. When shear-aligned within the hexagonal cylinder phase, and quenced to the gyroid phase or slightly below, we find ML alignment into a two-dimensional powder texture.
AB - We report extended crystallographic studies on shear-aligned block copolymer systems within the metastable modulated lamellae (ML) state. With studies limited to the "classical" orientations parallel and perpendicular to shear plane, the apparent modulated state would likely have been assigned simple lamellar. Surprisingly, upon rotating the sample to intermediate angles additional scattering reflections appear, which reveal the apparent ML phase much beyond what was expected. The modulated structure is a slightly distorted fcc structure. With the sample sheared at relatively low temperature, presumably below the stable gyroid phase, we find a very well resolved ML texture corresponding to a simple twin structure of the distorted fcc structure. When shear-aligned within the hexagonal cylinder phase, and quenced to the gyroid phase or slightly below, we find ML alignment into a two-dimensional powder texture.
U2 - 10.1021/ma8024249
DO - 10.1021/ma8024249
M3 - Journal article
VL - 42
SP - 1685
EP - 1690
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 5
ER -
ID: 14335699