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Block copolymers obtained by free radical mechanism III. Synthesis in emulsion
Author(s) -
Su John S. N.,
Piirma Irja
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070330304
Subject(s) - copolymer , polymer chemistry , styrene , emulsion polymerization , radical polymerization , methyl methacrylate , emulsion , materials science , radical initiator , kinetics , polymerization , chemistry , polymer , organic chemistry , physics , quantum mechanics
Block copolymers were synthesized by a sequential free radical polymerization method with the use of di‐t‐butyl‐4,4′‐azobis(4‐cyanoperoxyvalerate) as the trifunctional initiator. The polymerizations were carried out in two stages. First, the poly(methyl methacrylate) and poly(butyl methacrylate) polymeric initiators were synthesized by activating, at room temperature, the perester groups of the initiator with tetraethylenepentamine. For the second stage, the reaction ingredients were pre‐emulsified, then the azo groups of these polymeric initiators were activated thermally in the presence of either styrene or p ‐methylstyrene. It was found that the reaction in the emulsion particles followed bulk kinetics, although the average size of the particles was small, 50–100 nm.