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Download filePerpendicular Alignment and Selective Swelling-Induced Generation of Homopores of Polystyrene‑b‑poly(2-vinylpyridine)‑b‑poly(ethylene oxide) Triblock Terpolymer
journal contribution
posted on 2018-08-08, 16:21 authored by Leiming Guo, Zhaogen Wang, Yong WangArrays
of perpendicularly ordered nanopores with pore walls decorated by
two or more functional polymer chains are of great importance in various
applications. However, such porous structures have been rarely reported
so far. Herein, lamellar-forming triblock terpolymer of polystyrene-b-poly(2-vinylpyridine)-b-poly(ethylene
oxide) (PS-b-P2VP-b-PEO) is blended
with PS homopolymers to fabricate a PS matrix embedded with perpendicular
PEO@P2VP cylinders via solvent annealing. By further adjusting the
annealing humidity and temperature, the perpendicular PEO@P2VP cylinders
are capable of running through the entire films. The hydrophilic PEO@P2VP
domains could be converted into cylindrical homopores by ethanol swelling,
where the functional P2VP and PEO chains are distributed on the pore
walls. Moreover, water is able to swell PEO and also produces homopores
in such films. The pore sizes of the films are readily tuned in a
relatively large range depending on the swelling temperatures and
durations. The developed ordered nanostructures are expected to find
important applications in the range from template synthesis to membrane
separation and to nanofluidics.