Synthesis of pH-Responsive Particles with Shape Anisotropy | Zendy

Tianying Jiang | Zendy; Charles F. Zukoski | Zendy

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Synthesis of pH-Responsive Particles with Shape Anisotropy

Author(s) -

Tianying Jiang,

Charles F. Zukoski

Publication year - 2012

Publication title -

langmuir

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.042

H-Index - 333

eISSN - 1520-5827

pISSN - 0743-7463

DOI - 10.1021/la300376r

Subject(s) - copolymer , ionic strength , styrene , polymer chemistry , swelling , emulsion polymerization , polymerization , polystyrene , monomer , chemistry , van der waals force , chemical engineering , materials science , aqueous solution , organic chemistry , polymer , molecule , engineering

Seeded emulsion polymerization is used to produce large quantities of shape anisotropic, amphoteric particles in a size range of about 1 μm. Copolymer dicolloids (CDCs) containing pyridine groups are synthesized by swelling spherical, lightly cross-linked polystyrene seeds with a mixture of styrene and pH-responsive monomer 2-vinyl pyridine followed by secondary polymerization to contrast with their analogue homopolymer dicolloids (HDCs) where the swelling step is carried out with styrene alone. After the particles are coated with a nonionic surfactant to minimize van der Waals attractions, surface potentials and aggregation properties of dilute suspensions are studied as functions of pH and ionic strength. Compared to HDCs, which remain stable at all pH values studied (3 < pH < 9) up to an ionic strength of 5 M, the CDC particles show amphoteric behavior with strong attractions under conditions where dipolar interactions are expected to dominate.

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