S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Fabrication of Hollow Polystyrene Nanospheres in Microemulsion Polymerization Using Triblock Copolymers
Cited 129 time in Web of Science Cited 139 time in Scopus
- Issue Date
- American Chemical Society
- Langmuir 2002, 18, 5613-5618
- A ternary microemulsion polymerization was successfully used to prepare nanosized hollow polystyrene
(PS) microlatexes with triblock copolymers of poly(oxyethyene)-poly(oxypropylene)-poly(oxyethylene)-
[(EO)x(PO)y(EO)x]. Micelle formation using triblock copolymers is a useful nanoreactor in order to make
polymer nanoparticles in oil/water (o/w) microemulsions. Poly(methyl methacrylate)/cross-linked polystyrene
core/shell nanospheres have been fabricated by o/w microemulsion. PS hollow nanospheres were obtained
using the polymer core etching technique. Water-soluble and oil-soluble initiators were used for the
polymerization at 70 °C with moderate stirring and via modified buret feeding. After extraction of the
surfactant matrix, the polymer particles contract considerably without the change of their spherical shape.
The hollow sphere morphology and hollow image of the polymer particles were confirmed by field emission
scanning electron microscope and transmission electron microscope. PS hollow spheres were fabricated
with diameters in the range of ca. 15-30 nm, and the shell thickness was ca. 2-5 nm. The size of the hollow
nanoparticle is dependent on the surfactant concentration and the weight ratio of [surfactant]/[monomer].
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