Crosslinked maleic anhydride-vinyl acetate copolymer microspheres were synthesized by charge transfer complexes (CTC) self-stable precipitation polymerization with mean diameter of about 150 nm.Afterwards

copolymer microspheres/poly(ethylene) composites (CM/LLDPE) with low CM contents were used as pre-dispersed composites and melt-mixed with nylon6 (PA6) resin to prepare a series of PA6/LLDPE/CM composites with low CM contents.It was found that the divinylbenzenes double bond groups and poly(ethylene)

anhydride groups and nylon6 produced chemical reaction on phase interface respectively.According to the SEM analyses

it was found that the effect of various amounts of copolymer microspheres on the morphological structure and size of dispersed phase was obvious.It can effectively reduce the size of dispersed phase to fill the copolymer microspheres; on the surface of poly(ethylene) dispersed phase

the nano-sized microspheres played the role of a dispersed phase stabilizer

and this was similar to the emulsifier in emulsion polymerizationin.When the nano-sized microspheres content reached about 1.75%

the performance of composites was improved obviously:the impact strength of composites was increased by 1.35 times compared to pure nylon 6

although the tensile strength and Youngs modulus of composites were reduced by about 10%.The water absorption percentage droped to 1.2% compared to 4.9% of pure nylon 6.The toughening mechanism was also discussed in this paper;it was a new and important method to compatibilize two phase by stabilizing the size of dispersed phase.