Abstract: This work investigated the influence of three kinds of continuous mixing equipments, i.e. intermeshing corotating twinscrew extruder, intermeshing counterrotating twinscrew extruder and Buss kneader, on properties of polyphenylene oxide (PPO)/polyamide 66（PA66） alloys. Mechanical and scanning electron microscopic characterizations indicated that the intermeshing corotating twinscrew extruder as a conventional mixing equipment was suitable for the preparation of PPO/PA66 alloys in comparison with the other two equipments. The intermeshing counterrotating twinscrew extruder was also an appropriate processing means for PPO/PA66 alloys in some cases. Nevertheless, Buss kneader was unsuitable for processing PPO/PA66 alloys.

Key words: polyphenylene oxide, polyamide 66, alloy, mixing equipment