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Kinetics and mechanism of emulsifier‐free emulsion copolymerization
Author(s) -
Chen ShowAn,
Lee SongTai,
Lee ShienJy
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.19900350121
Subject(s) - comonomer , emulsion polymerization , polymer chemistry , copolymer , nucleation , chemical engineering , particle (ecology) , polymerization , ionic bonding , monomer , materials science , styrene , kinetics , polymer , chemistry , organic chemistry , composite material , physics , ion , oceanography , engineering , geology , quantum mechanics
In the emulsifier‐free emulsion polymerization of styrene/potassium persulfate (KPS) system, due to larger particle size and ionic chain ends, the polymerization only occurs in the shell part of the polymer particles (the shell‐growth mechanism). For the styrene/comonomer/KPS system, the hydrophilicity and ionic characteristic of the comonomer play a dominant role in the nucleation and growth mechanisms. If a nonionic comonomer is used, the shell‐growth mechanism also follows. If an ionic comonomer having sufficient cross‐propagation with the monomer is used, the particle size is small and the polymerization occurs uniformly within the particles as in the conventional case. If it has insufficient cross‐propagation, then shell‐growth mechanism occurs again.