Abstract: Abstract: Study the effect of grafting agent: allylmethacrylate(ALMA) on preparation of poly(butyl acrylate )/poly(methyl methacrylate - itaconicacid )(PBA/P(MMA-ITA)) core-shell particles and its application to toughness of nylon 6. The paper discusses effect of the amount of ALMA on average diameter of core-shell particle、gel content、mechanical properties and processing properties of toughened nylon 6. Experimental data indicated : grafting agent increase gel content, but no effect on average diameter. Introduce of suitable amount of ALMA enable impact strength and tensile strength of toughened nylon 6 reaching 20kJ/m2 and 35MPa respectively; melt viscosity、crystallinity degree and melting point all is decreased. Observe the section morphology of toughened nylon 6 by scanning electron microscope(SEM), showed that the toughening mechanism conformed to cavitation theory.

Key words: core-shell particle, toughening, nylon 6, grafting agent