Control Over the Microdomain Orientation of Block Copolymers Confined in Cylindrical Nanopores by Surface Modification
Date Issued
2012
Date
2012
Author(s)
Lin, Feng-Cheng
Abstract
A series of benzocyclobutene-functionalized random copolymers of styrene and 4-vinylpyridine were synthesized by nitroxide-mediated controlled radical polymerization. Our goal was to use these crosslinked random copolymers of P(S-r-BCB-r-4VP) as surface-modifiers to control the orientation of microdomains in lamella-forming and cylinder-forming of block copolymers in cylindrical nanopores of anodized aluminum oxide (AAO) membranes.
We introduced P(S-r-BCB-r-4VP) into the cylindrical nanopores of the AAO to form nanotubes. The block copolymers were then drawn through capillary forces from melt into P(S-r-BCB-r-4VP) nanotubes and phase separated in a confined environment where air-film interfaces are eliminated. For the compositions of random copolymers which are neutral to PS and P4VP blocks, we observed the orientation of the lamellae will change from parallel to perpendicular to the walls. For the cylinder-forming block copolymers, the morphology has changed from simple cylinders oriented parallel to the nanopores to a morphology where the cylinders form helices within the nanopores after nanopores modification.
Subjects
random copolymers
block copolymers
microdomain orientation
surface modification
AAO
Type
thesis
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