title: Directed assembly of cylinder-forming block copolymer films and thermochemically induced cylinder to sphere transition: a hierarchical route to linear arrays of nanodots.
abstract: A morphological transition from cylinders to spheres was induced in an asymmetric diblock copolymer, poly(styrene)-block-poly(tert-butyl acrylate) (PS-b-PtBA). The periodic arrays of the poly(tert-butyl acrylate) (PtBA) domains were transformed to the ordered poly(acrylic anhydride) (PAA) spheres via the thermal deprotection of tert-butyl acrylate linkages and the subsequent volume change of the minority block. Coupled with techniques to direct the assembly of cylinder-forming block copolymers, this finding provides new routes to fabricate ordered geometries of nanodot arrays.
authors.affiliation: Department of Chemical and Biological Engineering, Center for NanoTechnology, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: Young-Hye
authors.initials: YH
authors.lastname: La
authors.forename: Erik W
authors.initials: EW
authors.lastname: Edwards
authors.forename: Sang-Min
authors.initials: SM
authors.lastname: Park
authors.forename: Paul F
authors.initials: PF
authors.lastname: Nealey
mesh_terms: D000179:Acrylates / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D006358:Hot Temperature; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D044367:Phase Transition; D011137:Polystyrenes / Q000737:chemistry*
chemical_list: D000179:Acrylates; D008567:Membranes, Artificial; D011137:Polystyrenes