Polybenzoxazine / vermiculite hybrid nanocomposites were prepared from two kinds of polybenzoxazine precursors and two kinds of organically modified - vermiculite minerals and expanded - vermiculite which were consisted of vermiculite , hydrobiotite and phlogopite . after treatment of vermiculite minerals by hexadecyl trimethylam monium bromide ( ctab ) , the d001 of vermiculite layers of vermiculite mineral increased from 1 . 43nm to 2 . 67nm and developed a d002 = 1 . 34nm
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