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Synthesis and characterization of polystyrene latex with an amphoteric emulsifier
Author(s) -
Kato K.,
Kondo H.,
Yokota K.,
Esumi K.,
Meguro K.
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.1987.070330802
Subject(s) - emulsion polymerization , isoelectric point , polystyrene , styrene , zeta potential , polymerization , polymer chemistry , particle size , chemistry , nuclear chemistry , polymer , materials science , chemical engineering , copolymer , organic chemistry , nanoparticle , nanotechnology , engineering , enzyme
An emulsion polymerization of styrene in the presence of an amphoteric emulsifier of amino‐acid type, N ‐lauroyl‐ N,N ‐dimethyllysine (DMLL), has been studied at pH 7.0. The polymerization rate increased exponentially with the concentration of DMLL. The concentration of latex particles was proportional to the DMLL concentration to the 0.6 power. The latex particle size decreased with increasing concentration of DMLL. The molecular weight of polystyrene latexes increased with an increase in DMLL concentration. Furthermore, the zeta potentials of latex particles were significantly dependent on the pH, and showed the existence of an isoelectric point at about pH 4.0.