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Synthesis of hyperbranched poly( tert ‐butyl acrylate) by self‐condensing atom transfer radical polymerization of a macroinimer
Author(s) -
Cheng Guanglou,
Simon Peter F. W.,
Hartenstein Markus,
Müller Axel H. E.
Publication year - 2000
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20000801)21:12<846::aid-marc846>3.0.co;2-e
Subject(s) - atom transfer radical polymerization , polymer chemistry , acrylate , dispersity , radical polymerization , acryloyl chloride , polymerization , materials science , chemistry , polymer , copolymer , organic chemistry
Using 2‐hydroxyethyl α ‐bromoisobutyrate as initiator, atom transfer radical polymerization (ATRP) of tert ‐butyl acrylate leads to poly( tert ‐butyl acrylate) (PtBA) with a hydroxyl group at one and a bromine atom at the other end. Esterification of the hydroxyl group of these heterotelechelic polymers with acryloyl chloride yields PtBA ( M n = 3 060) with a polymerizable double bond at one end and a bromine atom at the other end which can act as an initiator in ATRP (“macroinimer”). Self‐condensing ATRP of such a macroinimer leads to hyperbranched or highly branched PtBA. The polymer was characterized by GPC viscosity measurements. Even at M w = 78 800, a rather low polydispersity index of M w / M n = 2.6 was obtained. A significantly lower value for the Mark‐Houwink exponent ( α = 0.47 compared to α = 0.80 for linear PtBA) indicates the compact nature of the branched macromolecules.