Monodisperse Core-shell Type Polystyrene/Silver Particles via Dispersion Polymerization and Modified Electroless Plating: Synthesis and Characterization
Date Issued
2014
Date
2014
Author(s)
Shen, Hsiu-Ping
Abstract
In this study, preparation of monodispersed silver-coated polystyrene core-shell type particles (Ag-PS) has been derived from a modified electroless silver plating process. The zeta potential, morphology and conductivity of the Ag-PS composite particles were investigated to study the influence of stabilizer, silver content and other experimental parameters.
This study included two parts. In the first part, polyethyleneimine (PEI) and polypyrrolidone (PVP) were served as stabilizers for producing monodispersed polystyrene latexes by dispersion polymerization. Then, the glass transition temperature (Tg), particle size, zeta potential and morphology were characterized by differential scanning calorimeter (DSC), dynamic light scattering analyzer (DLS), zeta potential analyzer, and scanning electron microscope (SEM), respectively. It was found that the Tg of polystyrene latexes was approximate to the pure polystyrene. In addition, the particle size was approximate to 3μm and monodispersed.
In the second part, a series of pretreatments of the PS surface was applied to modify the surface properties such as roughness, contact area and hydrophilic character. Then, silver nuclei produced on polystyrene particles served as nucleation sites for the growth of silver shell. The zeta potential, silver content, density, conductivity, particle size and morphology were characterized by zeta potential analyzer, thermogravimetric analyzer (TGA), pycnometer, four point probe and scanning electron microscope (SEM), respectively. X-ray diffractometer and energy-dispersive X-ray spectroscopy were employed to detect the crystallinity of silver and elements of composite particle. The results showed that a dense, stable and uniform silver shell was formed on the surface of PS particles. The bulk conductivity of the Ag-PS composites could achieve 2427 S/cm with only 36 wt.% silver content. According to the results, the Ag-PS composite particles with diameters of 3μm have great potential to be used as fillers in anisotropic conductive films.
Subjects
分散聚合法
無電電鍍法
核殼型乳膠顆粒
導電填充顆粒
高分子/銀複合材料
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-103-R01549021-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):25b91f8a74d47931a47b855cdf29fc7f