| 摘要 |
<p>The invention concerns a selective hydrogenation method for olefinic double bonds of block copolymers whereof at least one block contains olefinic double bonds using a catalyst based on a group VIII metal in a medium comprising an organic solvent for the copolymer and an ionic liquid as solvent of the catalyst, which consists in: using a water-immiscible ionic liquid, preferably an ionic liquid whereof the anion is the hexafluorophosphate anion and the cation is the 1-butyl-3-methyl-imidazolium (bmim+) or 1 ethyl-3-methyl-imidazolium (emim+). Said method, when used for poly(styrene)-b-poly(butadiene)-b-poly(methyl methacrylate) block polymers whereof the poly(butadiene) block has in majority a 1,4 microstructure, enables to obtain copolymers whereof the hydrogenation rate is not less than 50 % and having a melting point higher than 30 °C.</p> |
