Study On Preparation And Properties Of HDPE/SEBS/PA6 Ternary Blends

At present,the recycling of plastics is one of the key research fields in industry and academia.It is an economical and effective way to recycle waste plastics by compatibilization.In order to explore the effect of compatibilization on the microstructure evolution and mechanical properties of multi-component plastics,HDPE/SEBS/PA6 ternary blends were prepared and the microstructure and properties of HDPE/SEBS/PA6 ternary blends were studied by atomic force microscopy as follows:(1)HDPE-g-(MAH-co-St)as compatibilizer was prepared by melt grafting of maleic anhydride(MAH)and styrene(St)onto HDPE.When 15wt.%multicomponent compatibilizer was added to HDPE/SEBS/PA6 ternary blends,the breaking strength and elongation at break of the blends were increased by 160.31%and 676.44%compared with those of the uncompatibilized blends.SEM study on the morphology of the blends showed that with the increase of the amount of HDPE-g-(MAH-co-St),the structure of the blends changed from the core-shell structure of PA6 large particles partially coated by SEBS at the beginning to a large number of core-shell structures of PA6 small particles coated by SEBS in HDPE matrix.(2)The results of atomic force microscopy(AFM)nanomechanical mapping analysis show that the thickness of interface in HDPE/SEBS/PA6 blends first increases rapidly with the increase of HDPE-g-(MAH-co-St)compatibilizer content,and then tends to stabilize.Compared with the uncompatibilized system,the thickness of interface between HDPE/SEBS,SEBS/PA6 and HDPE/PA6 increased by 397.73%,391.67%and 327.87%respectively when the compatibilizer content was 15wt.%.The results of AFMIR show that the anhydride group in the compatibilizer reacts with the amino group on PA6,and the compatibilizer tends to be distributed at the interface of HDPE/PA6.