Abstract
Nanoporous thin films were prepared from poly(ethylene oxide)-b-poly(methyl methacrylate)-b-polystyrene (PEO-b-PMMA-b-PS) ABC triblock copolymer by solvent annealing under high relative humidity followed by UV degradation and acid washing. Ordered half-spheres at the surface that template ordering of spheres below the surface in thin films were formed as a result of the interaction between the hydrophilic PEO segments and water vapor during processing. The spherical block copolymer domains exhibit complex packing behavior on the surface and in the interior. A half-sphere "monolayer" and a half-sphere plus whole sphere "bilayer" were formed in thin films with thicknesses of 43 and 71 nm, respectively, and have hexagonal lattice symmetry. For half-sphere plus two whole sphere "trilayers" with a nominal thickness of 117 nm, coexistence of regions of hexagonal and square packing was observed by transmission electron microscopy, scanning force microscopy, scanning electron microscopy, and grazing-incidence small-angle X-ray scattering. Square packing was consistent with a surface-truncated unit cell of a body-centered cubic lattice with the (100) plane parallel to the surface.
| Original language | English |
|---|---|
| Pages (from-to) | 4328-4339 |
| Number of pages | 12 |
| Journal | Macromolecules |
| Volume | 41 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2008 Jun 24 |
Fingerprint
ASJC Scopus subject areas
- Materials Chemistry
Cite this
Square packing and structural arrangement of ABC triblock copolymer spheres in thin films. / Tang, Chuanbing; Bang, Joona; Stein, Gila E.; Fredrickson, Glenn H.; Hawker, Craig J.; Kramer, Edward J.; Sprung, Michael; Wang, Jin.
In: Macromolecules, Vol. 41, No. 12, 24.06.2008, p. 4328-4339.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Square packing and structural arrangement of ABC triblock copolymer spheres in thin films
AU - Tang, Chuanbing
AU - Bang, Joona
AU - Stein, Gila E.
AU - Fredrickson, Glenn H.
AU - Hawker, Craig J.
AU - Kramer, Edward J.
AU - Sprung, Michael
AU - Wang, Jin
PY - 2008/6/24
Y1 - 2008/6/24
N2 - Nanoporous thin films were prepared from poly(ethylene oxide)-b-poly(methyl methacrylate)-b-polystyrene (PEO-b-PMMA-b-PS) ABC triblock copolymer by solvent annealing under high relative humidity followed by UV degradation and acid washing. Ordered half-spheres at the surface that template ordering of spheres below the surface in thin films were formed as a result of the interaction between the hydrophilic PEO segments and water vapor during processing. The spherical block copolymer domains exhibit complex packing behavior on the surface and in the interior. A half-sphere "monolayer" and a half-sphere plus whole sphere "bilayer" were formed in thin films with thicknesses of 43 and 71 nm, respectively, and have hexagonal lattice symmetry. For half-sphere plus two whole sphere "trilayers" with a nominal thickness of 117 nm, coexistence of regions of hexagonal and square packing was observed by transmission electron microscopy, scanning force microscopy, scanning electron microscopy, and grazing-incidence small-angle X-ray scattering. Square packing was consistent with a surface-truncated unit cell of a body-centered cubic lattice with the (100) plane parallel to the surface.
AB - Nanoporous thin films were prepared from poly(ethylene oxide)-b-poly(methyl methacrylate)-b-polystyrene (PEO-b-PMMA-b-PS) ABC triblock copolymer by solvent annealing under high relative humidity followed by UV degradation and acid washing. Ordered half-spheres at the surface that template ordering of spheres below the surface in thin films were formed as a result of the interaction between the hydrophilic PEO segments and water vapor during processing. The spherical block copolymer domains exhibit complex packing behavior on the surface and in the interior. A half-sphere "monolayer" and a half-sphere plus whole sphere "bilayer" were formed in thin films with thicknesses of 43 and 71 nm, respectively, and have hexagonal lattice symmetry. For half-sphere plus two whole sphere "trilayers" with a nominal thickness of 117 nm, coexistence of regions of hexagonal and square packing was observed by transmission electron microscopy, scanning force microscopy, scanning electron microscopy, and grazing-incidence small-angle X-ray scattering. Square packing was consistent with a surface-truncated unit cell of a body-centered cubic lattice with the (100) plane parallel to the surface.
UR - http://www.scopus.com/inward/record.url?scp=47249103037&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=47249103037&partnerID=8YFLogxK
U2 - 10.1021/ma800207n
DO - 10.1021/ma800207n
M3 - Article
AN - SCOPUS:47249103037
VL - 41
SP - 4328
EP - 4339
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 12
ER -