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Phase Behavior of Block Copolymers in Selective Supercritical Solvent

Author:
Ito, Masateru M. M., Ito, Kohzo, Shibayama, Mitsuhiro, Sugiyama, Kenji, Yokoyama, Hideaki
Source:
Macromolecules 2015 v.48 no.11 pp. 3590-3597
ISSN:
1520-5835
Subject:
composite polymers, neutron diffraction, polymerization, solvents
Abstract:
The phase behavior of a block copolymer and supercritical fluid system was investigated. When a particular block was selectively swollen by the supercritical fluid, the apparent volume fraction of one domain was controlled by the pressure of the supercritical fluid. The morphological variation of polystyrene-b-poly[2-(perfluorooctylethyl) methacrylate]s (PS–PFMAs) with different ratios of PS to PFMA and the total degree of polymerization were analyzed. Time-resolved small-angle neutron scattering measurement revealed that lamellar and hexagonal phases coexist metastably, which may be induced by fluctuation of the supercritical fluid.
Agid:
5780705