Abstract: Alloys of polystyrene oxide (PPO) and polyamide 66 (PA66) were prepared via twinscrew extrusion and toughened with styteneethylenebutadienestyrene block copolymer(SEBS) and maleic anhydride grafted styreneethylenebutadienestyrene block copolymer(SEBSgMAH). Effects of SEBS and SEBSgMAH on properties of PPO/PA66 alloys were studied through mechanical property test, scanning electron microscopy(SEM), and water absorption. It showed that the toughness of PPO/PA66 alloys with SEBSgMAH was improved obviously, meanwhile its water absorption decreased.

Key words: polystyrene oxide, polyamide 66, alloy, styreneethylenebutadienestyrene block copolymer, mechanical property, water absorption