【摘要】 通过在聚苯醚（PPO）基材中引入间规聚苯乙烯（s PS）替代高抗冲聚苯乙烯（HIPS），并添加了苯乙烯-乙烯/丁二烯-苯乙烯嵌段共聚物（SEBS）和无卤阻燃剂，结合超临界二氧化碳发泡技术，制备了高强度、高阻燃聚苯醚复合发泡材料。研究了s PS引入对复合材料体系力学性能、发泡行为以及发泡材料压缩强度、阻燃性能的影响。结果表明：s PS的加入大幅度提高了复合材料的刚性和熔体黏弹性；增大的熔体黏弹性提高了复合材料的可发性；加入23%（质量分数，下同）s PS时，发泡倍率从5.9倍提高至36倍；复配无卤阻燃剂，能明显提升复合材料的阻燃性能；PPO/HIPS/s PS复合发泡材料密度为0.14 g/cm~3时，阻燃等级达到UL94 V-0级，极限氧指数（LOI）为27.4%；在相同密度0.29 g/cm~3时，加入23%s PS的PPO/HIPS/s PS复合发泡材料的压缩强度从1.9 MPa提高至6.4 MPa。更多还原

【Abstract】 In this study,a type of high-strength and high-flame retardant polyphenylene ether (PPO) composite foams was prepared by using syndiotactic polystyrene (s PS) instead of high-impact polystyrene (HIPS),styrene-ethylene/butadienestyrene block copolymers (SEBS),and halogen-free flame retardants through supercritical carbon dioxide foaming.The effect of s PS on the mechanical properties,foaming behavior,compressive strength,and flame-retardant performance of the composite foams were investigated.The results indicated that the introduction of s PS improved the rigidity and melt viscoelasticity of the composites significantly.The foamability of the composites was enhanced with an increase in the melt viscoelasticity.When 23 wt%s PS was added,the foaming rate of the composites increased from 5.9 to 36 times.The introduction of composite halogen-free flame retardants improved the flame-retardant performance of composite foams significantly.The PPO/HIPS/s PS composite foam with a density of 0.14 g/cm~3 reached a flame-retardant grade of the UL94V-0 rating and exhibited a limiting oxygen index of 27.4 vol%.At a density of 0.29 g/cm~3,the PPO/HIPS/s PS composite foam containing 23 wt%of s PS presented an increase in the compressive strength from 1.9 MPa to 6.4 MPa.更多还原