Abstract:

4-Styrene sulphonate intercalated layered double hydroxide(LDH)(MgAl-SS LDH), 10-undecylenate intercalated LDH(MgAl-U LDH), polyoxyethylene(10) α-propenyl alkylphenyl ether sulfate(HS-10) intercalated LDH(MgAl-HS10 LDH) were prepared by co-precipitation methods, respectively. The structure of LDH was characterized by X-ray diffraction, fourier transform infrared spectrometry, element analysis, and energy spectrum analysis. Three kinds of LDH were dispersed in different solvents. The particle size and morphology of LDH dispersions were investigated by laser particle analyzer and transmission electron microscope. It was found that MgAl-HS10 LDH could be well dispersed and partially exfoliate in dimethyl sulfoxide. Hansen′s three-dimensional solubility parameters were adopted to explain the dispersion activity of LDH. LDH dispersions were stable when the Hansen′s dimensional solubility parameters of the hydrophobic groups of intercalated agents are similar to those of the solvents. LDH layer has a strong exfoliation tendency when both polar(δ_p) and hydrogen-bonding(δ_h) forces of the hydrophobic groups of the intercalated agents are comparable to those of the solvents.

Key words: Layered double hydroxides, Intercalation, Hansen's solubility parameter, dispersion, exfoliated