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RESEARCH PRODUCT

Efficient Synthesis of High Molar Mass, First- to Fourth-Generation Distributed Dendronized Polymers by the Macromonomer Approach

subject

description

A homologous series of first- to fourth-generation (G1±G4) dendronized macromonomers, 5, 7, 10, and 12, was synthesized, and their poly- merization behavior under radical con- ditions investigated. These conditions were thermally induced radical poly- merization (TRP) and atom-transfer radical poymerization (ATRP). TRP was applied to all monomers and gave polymers PG1±PG4, whose molar masses range from several millions for PG1 to estimated several hundreds of thousands for PG2 and PG3, and to the oligomeric regime for PG4. ATRP was applied only to the G1 and G2 monomers 5 and 7. Kinetic studies on monomer 5 provide evidence that its polymerization proceeds in a control- led fashion. The highest monomer-to- initiator ratios which still gave mono- modal molar mass distributions were 300:1 (for 5) and 100:1 (for 7), which correspond to achievable molar mass regime for PG1 and PG2 of approxi- mately Mn = 100 000 (DPcalcd(PG1) = 200, DPcalcd(PG2) = 90). The polydis- persities lie in the usual range (PDI = 1.1±1.2). The molar masses were deter- mined by GPC in DMF with calibra- tion against absolute molar masses of PG1 determined by light scattering.