Monodispersed polystyrene latexes (100～500 nm) were prepared using seed emulsion polymerization.Hard and ordered polystyrene colloidal crystals were obtained by ambient drying the monodispersed polystyrene dispersion...Monodispersed polystyrene latexes (100～500 nm) were prepared using seed emulsion polymerization.Hard and ordered polystyrene colloidal crystals were obtained by ambient drying the monodispersed polystyrene dispersions.Polystyrene colloidal crystals were chemically modified by controlled sulfonation with sulfuric acid to derive a novel macro ordered hydrogels including ordered hydrogels and core/shell hydrogels,in which sulfuric acid and sulfone groups are responsible for the hydrophilic and crosslinking performances,respectively.The chemical structure and morphologies of the hydrogels were characterized by FT IR.It is shown that at a given concentration of sulfuric acid,the structural features of the samples are controlled by sulfonation time and temperature.The modification starts from the outer layer of polystyrene spheres of the colloidal crystals and increases both in reaction rate and sulfone group amount with temperature.A preliminary mechanism of the sulfonation process to prepare the ordered structures was proposed.展开更多
The viscosity behavior of the sulfonated polystyrene lanthanum ionomers(SPS La) has been investigated in comparison with the sodium and zinc ionomers in polar solvents. The results indicated that the SPS La with the s...The viscosity behavior of the sulfonated polystyrene lanthanum ionomers(SPS La) has been investigated in comparison with the sodium and zinc ionomers in polar solvents. The results indicated that the SPS La with the same sulfonation degree exhibited higher reduced viscosity and intrinsic viscosity when the polarity of the solvents was high. The lower the sulfonation degree of SPS La, the higher the reduced viscosity of SPS La, especially in case of estremely dilute dolutions. The order of the reduced viscosity and the polyelectrolyte effect tendency are:SPS Na>SPS Zn> SPS>SPS La .展开更多
文摘Monodispersed polystyrene latexes (100～500 nm) were prepared using seed emulsion polymerization.Hard and ordered polystyrene colloidal crystals were obtained by ambient drying the monodispersed polystyrene dispersions.Polystyrene colloidal crystals were chemically modified by controlled sulfonation with sulfuric acid to derive a novel macro ordered hydrogels including ordered hydrogels and core/shell hydrogels,in which sulfuric acid and sulfone groups are responsible for the hydrophilic and crosslinking performances,respectively.The chemical structure and morphologies of the hydrogels were characterized by FT IR.It is shown that at a given concentration of sulfuric acid,the structural features of the samples are controlled by sulfonation time and temperature.The modification starts from the outer layer of polystyrene spheres of the colloidal crystals and increases both in reaction rate and sulfone group amount with temperature.A preliminary mechanism of the sulfonation process to prepare the ordered structures was proposed.
文摘The viscosity behavior of the sulfonated polystyrene lanthanum ionomers(SPS La) has been investigated in comparison with the sodium and zinc ionomers in polar solvents. The results indicated that the SPS La with the same sulfonation degree exhibited higher reduced viscosity and intrinsic viscosity when the polarity of the solvents was high. The lower the sulfonation degree of SPS La, the higher the reduced viscosity of SPS La, especially in case of estremely dilute dolutions. The order of the reduced viscosity and the polyelectrolyte effect tendency are:SPS Na>SPS Zn> SPS>SPS La .
