Templated self-assembly of block copolymers using topographic templates is attractive because it can generate dense nanoscale patterns over a large area with a periodicity down to 10 nm. In our previous work, regular patterns were achieved by using a polystyrene-bpolydimethylsiloxane (PS-b-PDMS) block copolymer and topographic templates . However, more complex block-copolymer patterns required ...

Chirality-driven microphase-separated morphology, poly(l-lactide) (PLLA) left-handed nanohelices hexagonally packed in PS matrix, was obtained from chiral diblock copolymers, poly(styrene)-b-poly(l-lactide). This is perhaps for the first time; the helical superstructures of chiral block copolymers were generated in the bulk and self-assembled to a two-dimensionally (2D) packed lattice. Now, the...

Self-assembling materials are the building blocks of bottom-up nanofabrication processes, but they need to be templated to impose long-range order and eliminate defects. In this work, the self-assembly of a thin film of a spherical-morphology block copolymer is templated using an array of nanoscale topographical elements that act as surrogates for the minority domains of the block copolymer. Th...

Templated self-assembly of block copolymers using topographic templates is attractive because it can generate dense nanoscale patterns over a large area with a periodicity down to 10 nm. In our previous work, regular patterns were achieved by using a polystyrene-bpolydimethylsiloxane (PS-b-PDMS) block copolymer and topographic templates . However, more complex block-copolymer patterns required ...

Templated self-assembly of block copolymers using topographic templates is attractive because it can generate dense nanoscale patterns over a large area with a periodicity down to 10 nm. In our previous work, regular patterns were achieved by using a polystyrene-bpolydimethylsiloxane (PS-b-PDMS) block copolymer and topographic templates . However, more complex block-copolymer patterns required ...

The microstructure of the active blend layer has been shown to be a critically important factor in the performance of organic solar devices. Block copolymers provide a potentially interesting avenue for controlling this active layer microstructure in solar cell blends. Here we explore the impact of backbone fluorination in block copolymers of poly(3-octyl-4-fluorothiophene)s and poly(3-octylthi...

Biodegradable poly(ethyleneglycol)-poly(valerolactone)-poly(ethyleneglycol) [PEG-PVL-PEG] copolymers were synthesized through ring opening polymerization of δ-valerolactone (VL) followed by the coupling of monomethoxy poly(ethyleneglycol-poly(valerolactone) (mPEG-PVL) with hexamethylene diisocyanate (HDI). The copolymers were characterized by (1)H NMR, FT-IR, and GPC. Block copolymers of PEG an...

The morphology and the phase diagram of ABC triblock copolymer thin film directed by polymer brushes are investigated by the self-consistent field theory in three dimensions. The polymer brushes coated on the substrate can be used as a good soft template to tailor the morphology of the block copolymer thin films compared with those on the hard substrates. The polymer brush is identical with the...

Self-consistent field theory methodology is used to explore the graphoepitaxy of sphericalmorphology block copolymers templated by an array of posts, as well as to predict the formation of aperiodic templated structures, giving an excellent agreement with experimental results. Simulations in two and three dimensions were performed on model hexagonal lattices of posts with spacing, Lpost that wa...