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Synthesis of telechelics and block copolymers via “living” radical polymerization
Author(s) -
Keul Helmut,
Neumann Andreas,
Reining Birte,
Höcker Hartwig
Publication year - 2000
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200010)161:1<63::aid-masy63>3.0.co;2-1
Subject(s) - copolymer , polymer chemistry , atom transfer radical polymerization , moiety , methyl methacrylate , ethylene oxide , polymerization , telechelic polymer , materials science , end group , radical polymerization , chemistry , organic chemistry , polymer
Hydroxy‐telechelic poly(methyl methacrylate)s of molecular weights below 5000 were obtained by atom transfer radical polymerization (ATRP) of methyl methacrylate followed by end‐capping with allyl alcohol via atom transfer radical addition (ATRA). As initiators for the ATRP, monofunctional initiators with an additional hydroxy group in the molecule or bifunctional initiators were employed. The successful synthesis of the hydroxy‐telechelic PMMA was proved by determination of their molecular weight using MALDI‐TOF‐MS. The efficiency of the end‐capping reaction was determined by 1 H NMR spectroscopy using the allyl N ‐(4‐tolyl)carbamate as end‐capping agent. Block copolymers comprising a poly(ethylene oxide) (PEO) block and a poly(methyl methacrylate) (PMMA) block were prepared by ATRP using a macroinitiator on the PEO basis. The dormant species of the macroinitiator consists of the phenyl chloroacetate moiety which shows a high rate of initiation. The successful synthesis of the poly(ethylene oxide)‐ block ‐poly(methyl methacrylate) was proved by 1 H NMR spectroscopy; the ratios of EO/MMA repeating units in the feed and the copolymer were nearly equal.