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Surface properties of polymethylenediamine‐fixed styrene/acrylic acid copolymer latex
Author(s) -
Tamai H.,
Kiyota H.,
Suzawa T.
Publication year - 1992
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.1992.070450110
Subject(s) - copolymer , isoelectric point , styrene , flocculation , acrylic acid , dispersion (optics) , electrolyte , materials science , polymer , polymer chemistry , chemical engineering , chemistry , composite material , organic chemistry , physics , optics , electrode , engineering , enzyme
Surface charge density, ζ‐potential, and dispersion stability of polymethylenediamine (PMD)‐fixed styrene/acrylic acid copolymer [P(St/AA)] latex were investigated. PMD‐fixed P(St/AA) latices are amphoteric and have isoelectric points at pH 4–7. Though the flocculations were observed at neutral pH, the pHs where the flocculation rates were maximum are slightly higher than were the isoelectric points. This result suggests the influence of the expansion of PMD‐fixed polymer layer surrounding the particles on the flocculation. The fixation of PMD to the surface of P(St/AA) latex lowers the dispersion stability for high electrolyte concentration.