| 초록 |
The cationic surfactants, vinylbenzyldimethylalkylammonium chlorides (VDAC, alkyl = ethyl, octyl, dodecyl, octadecyl) was synthesized for funtionalization of montmorillonite. VDAC modified montmorillonites were synthesized by cationic exchange between sodium ions of MMT and alkyl ammonium cations of VDAC. Polymer-clay nanocomposites of styrene-b-butadiene-b-styrene (SBS) with VDAC-MMT were prepared via solution process, using tetrahydrofuran as a solvent. From the results of X-ray diffraction (XRD) and transmission electron microscopy (TEM), the interlayer spacings of VDAC-MMT were increased, compared to that of the pristine Na+-MMT. The SBS/VDAC-MMT nanocomposites showd improved tensile properties and high glass transition temperature (Tg) of styrene blocks, compared to those of SBS/Na+-MMT.
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