(177a) Self-Disassembly of Two-Dimensional Zeolites in Liquid Polybutadienes
The 2D zeolite nanosheets with an MWW framework have an external surface with 12 membered ring (MR) pockets and 6MR transport limiting apertures, around 0.3 nm, and can potentially separate H2 from CO2. MCM-22, a layered precursor of MWW framework, was successfully exfoliated, and single-layer-thick nanosheets were obtained by the novel exfoliation method. The layered precursor MCM-22 was first swollen using a long-chain surfactant (cetyltrimethylammonium bromide) to increase its interlayer spacing. This was followed by hand-mixing the swollen zeolite with a liquid polybutadiene with functional end-groups. The zeolite was intercalated by the polymer and exfoliated merely by hand-mixing. The exfoliated zeolite nanosheets can form a stable suspension in an organic solvent, providing exciting potential for the fabrication of zeolite membranes, composite materials, and hierarchical zeolites. The exfoliation method can also be applied to other 2D zeolite precursors.