Core-shell functional microspheres by dispersion polymerization: 2. Synthesis and characterization

Preparation of Linear and Crosslinked Polymer Microspheres by Dispersion Polymerization

“…Costabilizers are low molecular weight compounds, either anionic, cationic or nonionic surfactants (AOT, Aliquat 336, Triton N-57) or long chain alcohols (cetyl alcohol), used along with stabilizer to facilitate the particles' formation stage to get monodispersed particles (4,23,27,28,30,32,55,81). Earlier reports emphasized the need of costabilizer for achieving monodispersity of particles (27,55) whereas later investigators are of the opinion that costabilizer is necessary only if the stabilizer concentration is less than 7 g/L in the medium (20,28,63,82).…”

Narrow‐disperse or monodisperse crosslinked and functional core–shell polymer particles prepared by two‐stage precipitation polymerization

“…Through the use of a series of sequential seeded growth‐emulsion polymerizations, Rundin's11 group prepared monodisperse latex core–shell particles with diameters of 3 μm. There have been a few reports on core–shell particles of a micrometer size prepared by dispersion polymerization: Laus et al12, 13 reported the preparation of monodisperse polystyrene particles 2–10 μm in size in the presence of a poly(carboxylic acid) or a polyepichlorohydrine steric stabilizer, which itself then constituted the shell. Okubo et al14 conducted the dispersion copolymerization of p ‐chloromethylstyrene (CMSt) and styrene (St) on polystyrene seeds, which adsorbed the monomer mixture and yielded micrometer‐size monodisperse polymer microspheres with chloromethyl groups in the shell.…”

Polymer Encapsulated Inorganic Black Pigment Nanoparticles and Their Electrophoretic Characteristics

“…Poly(St-co-AN) coated black-444 particles were prepared through a two-stage dispersion polymerization technique. 12 At the first, 10 g of poly(vinyl pyrrolidone) (PVP, Mw = 55,000 g/mol, Aldrich Co., USA) as a stabilizer was dissolved in 280 ml isopropyl alcohol in a 500-ml round bottomed flask equipped with a mechanical stirrer under nitrogen purged. The 5 g of black-444 pigments were sonicated in the PVP dissolved methanol solution for 2 h. After sonication, both styrene (6.6 g) and acrylonitrile (3.4 g) were added and the initiator (0.11 g), 2,2-azobisisobutyronitrile (AIBN, Aldrich Co.), was also added into the reactor together.…”