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In recent decades, polyolefin / barrier resin material in the packaging industry and the automobile industry uses more widely. Research and development of polymer material having high barrier becomes increasingly important. This paper systematically studied the HDPE / EVOH and HDPE / PA blends two kinds of forms, barrier properties and mechanical properties . In HDPE5000S/EVOH, HDPE5000S/PA layered composites , using a single screw extruder , add the appropriate compatibilizer prepared by blending barrier material . Scanning electron microscope (SEM) observation of the dispersed phase in the matrix form, and indirectly, by oil absorption method characterized polyolefin composites barrier properties. Study the processing conditions and blend component ratio on barrier composite dispersed phase morphology, barrier properties and mechanical properties. The results show that when the screw speed 24rpm, processing temperatures were 220 ??℃, EVOH content of 20% wt when , HDPE / EVOH blend composite can be obtained and the formation of a large aspect ratio of the dispersed layered structure significantly reduced absorption rate small , barrier performance is significantly improved. When the screw speed 24rpm, processing temperatures were 235 ℃, PA when the content of 25% wt , HDPE / PA blend may get a larger aspect ratio of the dispersed phase and the formation of a layered structure , absorption rate significantly reduced, the barrier properties been significantly improved. In the above case , the two composite mechanical
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