| 摘要 |
<p>Trisequenced copolymer A-B-C with an Mn from 3 000 to 300 000 and a polydispersity from 1.05 to 2.0, A and C both being an acrylic, vinylaromatic, methacrylic or maleimide sequence, B being an acrylic, vinylaromatic or methacrylic sequence, at least one of A or C being chosen in a different class from that of group B. To prepare the copolymer, anionic polymerisation is carried out on at least one A monomer, with the help of an initiator system formed by at least one monofunctional initiator (R)p-M (M = alcaline metal or alcaline earth metal, p = valence of M, and R = C2-6 alkyl or C1-6 alkyl substituted by at least one phenyl group), and at least one ligand (a salt of an alcaline metal or an alcaline earth metal). The live link A- obtained with at least one B monomer is made to react; the copolymer (A-B)- obtained is made to react with at least one C monomer, and the copolymer (A-B-C)- obtained is made to react with at least one protolytic compound. If A and C are identical, a bifunctional initiator is used during the first stage.</p> |
