Dilute and semidilute solutions of ABA block copolymer in solvents selective for A or B blocks: 1. Small-angle X-ray scattering study

0331222 - ÚMCH 2010 GB eng J - Článek v odborném periodiku
Pleštil, Josef - Hlavatá, Drahomíra - Hrouz, Jaroslav - Tuzar, Zdeněk
Dilute and semidilute solutions of ABA block copolymer in solvents selective for A or B blocks: 1. Small-angle X-ray scattering study.
Polymer. Roč. 31, č. 11 (1990), s. 2112-2117. ISSN 0032-3861. E-ISSN 1873-2291
Klíčová slova: block copolymer micelles * zero-shear viscosity * small-angle X-ray scattering * space correlation in semidilute solutions
Impakt faktor: 1.336, rok: 1990

Solutions of a triblock copolymer, polystyrene-block-poly(hydrogenated butadiene)-block-polystyrene, in a selective solvent either for the aliphatic middle block (heptane) or for the polystyrene outer blocks (1,4-dioxane/25 vol% heptane) were studied by viscometry and small-angle X-ray scattering. In both systems, micelles were detected with uniform spherical cores formed by insoluble copolymer blocks. In semidilute solutions, in concentration regions above 0.01 g cm−3 in heptane and not, vert, similar0.1 g cm−3 in the mixed solvent, micelles were found to be space-correlated, the effect being accompanied by a steep increase in zero-shear viscosity. Aliphatic micellar cores in the mixed solvent are highly swollen due to the effect of selective sorption.
Trvalý link: http://hdl.handle.net/11104/0005503