TY - JOUR
T1 - Soap-free synthesis for producing highly monodisperse, micrometer-sized polystyrene particles up to 6 μm
AU - Yamada, Yasuyuki
AU - Sakamoto, Tatsuro
AU - Gu, Shunchao
AU - Konno, Mikio
N1 - Funding Information:
This research was partially supported by a Grant-in-Aid for Science Research (No. 14750612) and by the COE project Giant Molecules and Complex Systems from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
PY - 2005/1/1
Y1 - 2005/1/1
N2 - A soap-free emulsion polymerization method with the use of an amphoteric initiator, currently proposed by the authors for producing highly monodisperse, micrometer-sized polymer particles, was examined in the polymerization of styrene with a 2,2′-azobis [N-(2-carboxyethyl)-2-2-methylpropionamidine] hydrate initiator and an NH 4OH/NH 4Cl pH buffer. The pH buffer was used to control the electric surface potential of particles to maintain a stable dispersion of particles and to prevent generation of new particles during the polymerization. Addition of monomer to the reaction system during polymerization could enlarge the average size of polymer particles to 5.7 μm with a coefficient of variation of 1.5%, which is much less than the standard criteria of monodispersity, 10%.
AB - A soap-free emulsion polymerization method with the use of an amphoteric initiator, currently proposed by the authors for producing highly monodisperse, micrometer-sized polymer particles, was examined in the polymerization of styrene with a 2,2′-azobis [N-(2-carboxyethyl)-2-2-methylpropionamidine] hydrate initiator and an NH 4OH/NH 4Cl pH buffer. The pH buffer was used to control the electric surface potential of particles to maintain a stable dispersion of particles and to prevent generation of new particles during the polymerization. Addition of monomer to the reaction system during polymerization could enlarge the average size of polymer particles to 5.7 μm with a coefficient of variation of 1.5%, which is much less than the standard criteria of monodispersity, 10%.
KW - Amphoteric initiator
KW - Colloidal stability
KW - Monodisperse polystyrene particle
KW - Monomer addition
KW - Soap-free emulsion polymerization
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U2 - 10.1016/j.jcis.2004.08.030
DO - 10.1016/j.jcis.2004.08.030
M3 - Article
C2 - 15567403
AN - SCOPUS:9644266745
VL - 281
SP - 249
EP - 252
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 1
ER -