  Anionic polymerization of acrylic monomers. 8. Synthesis and characterization of (meth)acrylic end-functionalized polymers: macromonomers and telechelics; ; et al in Macromolecules (1992), 25(21), 5578-5584 Tailor-made poly(tert-butyl acrylate) macromonomers, which are useful building blocks for the synthesis of comb or multiblock copolymers, have been successfully synthesized by deactivation of living PtBA ... [more ▼] Tailor-made poly(tert-butyl acrylate) macromonomers, which are useful building blocks for the synthesis of comb or multiblock copolymers, have been successfully synthesized by deactivation of living PtBA macroanions with suitable electrophiles bearing either styrene or methacrylic unsaturation. Mono- or bifunctional initiators such as sec-butyllithium or naphthalenyllithium can be used. When these initiators were modified by LiCl as a mu-type ligand, the macroanions which are known to be living were functionalized with high efficiency. Characterization of the various macromonomers was performed using H-1 NMR spectroscopy and SEC. [less ▲] Detailed reference viewed: 11 (1 ULg)Anionic polymerization of acrylic monomers. 6. Synthesis, characterization, and modification of poly(methyl methacrylate)-poly(tert-butyl acrylate) di- and triblock copolymers; ; et al in Macromolecules (1991), 24(18), 4997-5000 Poly(methyl methacrylate)-b-poly(tert-butyl acrylate) (PMMA-b-PtBA) copolymers have been successfully synthesized by the sequential anionic polymerization of methyl methacrylate (MMA) and tert-butyl ... [more ▼] Poly(methyl methacrylate)-b-poly(tert-butyl acrylate) (PMMA-b-PtBA) copolymers have been successfully synthesized by the sequential anionic polymerization of methyl methacrylate (MMA) and tert-butyl acrylate (tBA) in THF at -78-degrees-C. Although the order of monomer addition makes a difference on the initiation efficiency, it has no significant effect on the final achievement. Mono- and bifunctional initiators based on alkali metals can be used. When the initiators are modified by LiCl as a ligand, the polymerization of each block appears to be living, the molecular weight and composition can be predicted, and the molecular weight distribution is narrow. Size exclusion chromatography supports the absence of homo-PtBA in the PtBA-b-PMMA samples. The PtBA blocks can be quantitatively hydrolyzed into polyacid ones as supported by titration and H-1 NMR analysis. [less ▲] Detailed reference viewed: 20 (1 ULg)Anionic polymerization of acrylic monomers. V. Synthesis, characterization and modification of polystyrene-poly(tert-butyl acrylate) di- and triblock copolymers; ; et al in Macromolecules (1990), 23(17), 3893-3898 Detailed reference viewed: 19 (2 ULg)Termination mechanism in the anionic copolymerization of methyl methacrylate and tert-butyl acrylate; ; et al in Macromolecules (1990), 23(17), 4024-4025 Detailed reference viewed: 13 (1 ULg) |
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