Ordering Transitions of Semifluorinated Diblock Copolymers
A series of diblock copolymers consisting of a hydrophilic polyethylene oxide (PEO) and a hydrophobic poly(1H,1H-dihydroperfluorooctyl methacrylate) (PDHFOMA) block were synthesized with different chain lengths for application to self-assembled nanopatterning structures. The morphology of poly(DHFOMA5k-b-EO5k), poly(DHFOMA10k-b-EO10k), and poly(DHFOMA20k-b-EO20k) spin cast from micellar solution in chloroform at room temperature were spherical with average diameter of 12 nm, 17 nm and 26 nm, respectively by TEM analysis. The spherical structures were reorganized to different shapes with thermodynamically stable morphologies upon annealing above glass transition temperature (Tg ). PDHFOMA block domains changed to well ordered cylindrical domains, inversed continuous phase, and large composite spherical domains for 5 k, 10 k, and 20 k block copolymer, respectively.
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Document Type: Research Article
Publication date: 01 September 2008
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