Journal
ACS NANO
Volume 5, Issue 3, Pages 1928-1938Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn1029444
Keywords
block copolymers; nanorods; swelling; mesopores; Rayleigh instabilities
Categories
Funding
- National Natural Science Foundation of China [21004033]
- Jiangsu Natural Science Foundation [BK2009358]
- State Key Laboratory of Polymer Physics and Chemistry (Changchun Institute of Applied Chemistry)
- German Research Foundation [1420]
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Nanoscopic domain structures of BCP nanorods can be converted into well-defined mesopore systems by swelling the BCP minority component with a selective solvent at temperatures below the bulk glass transition temperature of the nonswelling matrix. The Initial stage of this process Involves rapid morphology reconstruction of the nonswelling majority domains to accommodate the increased volume of, the swelling minority domains caused by rapid solvent uptake. Morphology reconstruction slows down once entropic restoring forces of the swelling chains impede further uptake of swelling agent. Upon evaporation of the swelling agent mesopores,form in place of the swollen domains as the swollen minority blocks undergo entropic relaxation while intermediate nonequilibrium morphologies In the BCP nanorods are fixated by the reconstructed majority component The surface area of mesopores developing when swollen cylindrical minority domains collapse may be minimized by the growth of Rayleigh instabilities. Depending on swelling temperature, swelling agent and BCP architecture, BCP, nanorods with one or several cylindrical channels undulated or uniform in diameter running along their long axes, linear strings of spherical cavities, and continuous mesopore systems can be obtained.
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