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Polymeric surfactants in emulsion polymerization
Author(s) -
Piirma I.
Publication year - 1990
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19900350128
Subject(s) - copolymer , ethylene oxide , polymer chemistry , styrene , acrylonitrile , emulsion polymerization , amphiphile , polymerization , emulsion , monomer , materials science , polystyrene , methyl methacrylate , chain transfer , chemical engineering , polymer , chemistry , radical polymerization , organic chemistry , composite material , engineering
The stabilizing efficiency of a variety of amphipathic copolymers was studied in aqueous emulsion polymerizations of styrene, methyl methacrylate and acrylonitrile. Using the number, and size of the particles as the criterion of stability, it was found that the availability for anchoring of the backbone in the amphipathic graft copolymers was crucial for stability. Within a system, a change in the backbone chain length with the same percent hydrophilic grafts had no effect on the outcome of the reaction: the latices stabilized to the same number of particles of the same size. The results with the polystyrene‐block‐poly(ethylene oxide) copolymers as stabilizers in styrene polymerization gave indication that for efficient anchoring the block length need not be more than 10 monomeric units, and that a poly(ethylene oxide) (PEO) with weight‐average molecular weight M w = 3000 is just as effective stabilizer as is a block with PEO of M n = 9000.