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Strongly Phase-Segregating Block Copolymers with Sub-20 nm Features
CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY AND BIOCHEMISTRY
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The modular synthesis and lithographic potential of diblock copolymers based on polystyrene-block-poly2-ethyl-2- oxazoline PS-b-PEtOx are highlighted herein. Controlled radical and living cationic polymerization techniques were utilized to synthesize hydrophobic PS and hydrophilic PEtOx building block of varying molar mass. Subsequently, click chemistry was used to couple the blocks and obtain a family of PS-b-PEtOx polymers. The influence of molar mass, composition, and thin-film thickness on the microphase-segregated morphology and orientation were investigated with atomic force microscopy AFM and grazing incidence small-angle X-ray scattering GISAXS. Dense hexagonal arrays of cylindrical nanodomains normal to the substrate, having a periodicity of less than 20 nm were obtained.
APPROVED FOR PUBLIC RELEASE