Delamination Of Layered Double Hydroxides In Microemulsion And Application In Nanocomposites

Polymer/inorganic nanocomposites attract scientists' great interests because of their excellent properties than their counterparts. To solve the problem of the dispersion of the inorganic materials in the polymer matrix, we propose to prepare the solid delaminated layered double hydroxides (LDH) in a microemulsion, and disperse these inorganic materials into the polymer matrix to prepare a kind of nanocompostes.In my research, the delamination of layered double hydroxides (LDH) is achieved in a microemulsion composed of alkyl/ N-Lauroyl-glutamate/water. The diffraction peaks at low angle characteristic of LDH disappeared when the amount of alkyl reached a proper degree in the microemulsion, indicating that LDH layers might be delaminated. The delamination of LDH layers is proved by further carbonate-exchanged experiment. The delaminated LDH gives a larger pore volume, surface area and pore diameter than the intercalated counterpart.Subsequently, nanocomposites, which are based on PS, PVAc and PMMA polymers and use the delaminated layered double hydroxides as fillings are prepared by in-situ method and blending method. Nanocomposites exhibit improved thermal stabilities and mechanical properties than their counterparts.PP nanocomposites blended with LDH are also prepared by blending-method, nanocomposites with delaminated LDH exhibit better mechanical properties than the polymer matrixs.