Premium
Styrene–isoprene block copolymers. II. Hydrogenation and solution properties
Author(s) -
Velichkova R.,
Toncheva V.,
Antonov C.,
Alexandrov V.,
Pavlova S.,
Dubrovina L.,
Gladkova E.
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070421202
Subject(s) - copolymer , micelle , isoprene , degree of unsaturation , cyclohexane , polymer chemistry , styrene , monomer , polymer , materials science , aggregation number , chemistry , critical micelle concentration , chemical engineering , organic chemistry , aqueous solution , engineering
Styrene–isoprene block copolymers with a different degree of monomer distribution are hydrogenated with homogeneous catalysts. The products are characterized by means of IR and 1 H‐NMR spectroscopy, GPC, viscometry, and light scattering. Hydrogenation proceeds without destruction and selectively for olefinic unsaturation. The hydrogenated copolymers are homogeneous in molecular weights and chain composition. The influence of the copolymer structure on the solution properties in selective solvents is established. In cyclohexane an equilibrium between micelle associates and individual polymer coils, monomolecular micelles, or micelle aggregates are observed, depending on the type of the copolymer. The micellization in base‐lubricating oil leads to micelle fractions with a different degree of association.