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Poly(acrylic acid)–Poly(ethylene oxide) Comb Polymer Effects on BaTiO 3 Nanoparticle Suspension Stability
Author(s) -
Kirby Glen H.,
Harris Daniel J.,
Li Qi,
Lewis Jennifer A.
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.00181.x
Subject(s) - dispersant , acrylic acid , materials science , nanoparticle , chemical engineering , polymer , ethylene oxide , counterion , aqueous solution , ionic strength , polymer chemistry , zeta potential , potentiometric titration , inorganic chemistry , chemistry , ion , organic chemistry , composite material , nanotechnology , copolymer , dispersion (optics) , physics , engineering , optics
We have studied the effects of poly(acrylic acid)–poly(ethylene oxide) (PAA–PEO) comb polymers on the stability of aqueous BaTiO 3 nanoparticle suspensions over a wide pH range in the presence and absence of mono‐ and divalent salt species. The comb polymer architecture consists of charge‐neutral PEO teeth attached at random intervals along an ionizable PAA backbone. Potentiometric titrations, light scattering, and turbidity measurements were conducted on pure PAA and PAA–PEO solutions to assess their degree of ionization, radius of hydration, and stability. Adsorption isotherm and rheological measurements were conducted on BaTiO 3 nanoparticle suspensions to determine the effectiveness of both PAA and PAA–PEO dispersants. Our observations indicate that the presence of PEO teeth effectively shield the underlying PAA backbone from ion interactions, e.g., counterion‐screening or ion‐bridging effects, thereby allowing PAA–PEO dispersants to impart stability to BaTiO 3 nanoparticle suspensions over a wide range of pH, ionic strength, and ion valency conditions where pure PAA fails.