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Block copolymers by sequential group transfer polymerization: poly(methyl methacrylate)‐ block ‐poly(2‐ethylhexyl acrylate) and poly(methyl methacrylate)‐ block ‐poly( tert ‐butyl acrylate)
Author(s) -
Masař Bohumil,
Vlček Petr
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950224
Subject(s) - copolymer , polymer chemistry , methyl methacrylate , acrylate , polymerization , catalytic chain transfer , materials science , methyl acrylate , methacrylate , butyl acrylate , poly(methyl methacrylate) , polymer , chemistry , composite material
Abstract Poly(methyl methacrylate)‐ block ‐poly(2‐ethylhexyl acrylate) (PMMA‐ block ‐PEHA) and poly(methyl methacrylate)‐ block ‐poly( tert ‐butyl acrylate) with a methacrylate/acrylate unit ratio of 1:1 and 1:3, 16000 < M n < 44000 and 1,9 < M w / M n < 2,5, were prepared by sequential group transfer polymerization using (1‐methoxy‐2‐methyl‐1‐propenyloxy)trimethylsilane as initiator and tetrabutylammonium fluoride monohydrate as a catalyst in tetrahydrofuran at −30°C, PMMA being the first block. The increase in M n during the successive addition of monomers is linearly dependent on the (co)polymer yield and size‐exclusion chromatography (SEC) curves are shifted towards higher molecular weights in comparison with PMMA macroinitiators. The block structure of the copolymers was also proven by extraction experiments. The presence of homopolymers in the copolymers was not detected. When the former copolymer is prepared in a reverse way (PEHA segment being the first), the MMA polymerization ceases at ≈ 43–45% conversion.