To synthesize an epoxy-montmorillonite nanocomposite, the intercalation of clay layers with acid onium ions {[H3N(CH2)(n-1)COOH](+), [H3N(CH2)(n-1)CH3](+), [H3N(CH2)-NH2](+), and [H3N(CH2)(n)NH3](2+)) by different methods were studied. The intercalated cl