Research On The Blending Processes Of PPO/PA66In-situ Compatibilized By Citric Acid

To solve the compatibility of polyphenylene oxide (PPO) and nylon66(PA66) alloy, citric acid in-situ-compatibilization method and differentblending technology were introduced, comparing with the compatibilizingeffect of current compatibilizers PPO-g-MAH. The effect of compatibilizerson the mechanical performance and micromorphology of the alloy wasinvestigated, and the mechanism of compatibilization by citric acid wasdiscussed.1. Different extrusion blending process, including once-extrusion,twi-extrusion and side feed extrusion technology, were chosen to analyze theeffect of blending process on performance of the alloy, such as mechanicalperformance, micromorphology and particle size distribution of dispersedphase. The results show that, when citric acid in-situ-compatibilizationmethod was used, alloy with excellent performance can be obtained. Thetensile strength of the alloy is up to70.7MPa, its flexural strength can reach90.3MPa, and its impact strength is up to16.3kJ/m~2.2. Twi-extrusion technology was researched through orthogonalexperiment to choose the most suitable manufacturing process. The results of orthogonal analysis show that, excellent compatibilizing effect of the alloy canbe obtained.when300r/min screw speed, and2portions of compatibilizerwere used.3. Citric acid and PPO-g-MAH were used in the in-situ-compatibilizationof PPO/PA66. The compatibilizing effects of the two compatibilizers werecompared. The results show that, when citric acid in-situ-compatibilizationmethod was used, alloy with excellent mechanical performance and smallerdomain size of the dispersed phase can be obtained.4. Citric acid was used as a compatibilizer, on this basis of side feedextrusion process, screw configuration was optimized, and its effect onperformance of the alloy was investigated. The results show that, the additionof inverting element and meshing component can increase the mixing abilityand shearing ability of the extruder, which is beneficial to the reaction andblending of different compositions, and this can finally improve theperformance and micromorphology of the alloy. The tensile strength of thefinal produced alloy is up to73.6MPa, its flexural strength can reach95.7MPa, and its impact strength is up to19.8kJ/m~2.