Preparation, characterization and properties of amino-functionalized montmorillonite and composite layer-by-layer assembly with inorganic nanosheets

► Amino-functionalized montmorillonite (APTMS-MMT) was prepared by the ultrasonic process. ► The ultrasonic process improved the stability of MMT suspension. ► The ultrasonic process of increased the dispersability of MMT in the PAA matrix. ► The ultrasonic process improved greatly the mechanical properties of the composites.