Gas permeability of a polystyrene-polybutadiene block copolymer with oriented lamellar domains

Barrier films made with various lamellar block copolymers

“…We note that previous studies of this idea have not been especially successful, apparently because the lamellae were not adequately aligned [12][13][14]. However, in an earlier study in this laboratory, we showed that (polylactide-b-isoprene-b-lactide) actually gave slightly better performance than that predicted for aligned lamellae [15].…”

“…(3) [12][13][14][15]. These larger permeabilities have sensibly been ascribed to lamellar misalignment.…”

Control of Microdomain Orientation in Block Copolymer Thin Films by Electric Field for Proton Exchange Membrane

“…On the other side, numerous studies have been conducted on developing new PCMs using block copolymers (BCPs) over the past decades [9]- [19]. Attention to the block copolymer polyelectrolytes (BCPEs) as a candidate for PCMs has been paid, because they exhibit unique morphologies such as sphere, cylinder, lamellar, and gyroid due to the self assembled-nanostructures.…”

“…It has been found that the microdomain structure in BCPEs is strongly dependent on the solvent [20], annealing condition [21], shear force [22], and film thickness [23]. Also, it is very important to understand transport properties such as proton conductivity and methanol permeability through BCPE membranes when the size, shape, and ordering directions of microdomains in the membranes are different [19] [24].…”

Morphology of Highly Textured E/EP Diblock Copolymers

“…One set of properties which is exquisitely sensitive to such morphological change is the gas transport behavior where very simple upper and lower bound models [27,28] can be written for the case of permeation parallel to and perpendicular to the orientation of the lamellar structure. The intermediate case of gas permeation in a material with random lamellar orientation is also readily modeled [13,29].…”