以普通石膏为基体，聚甲基丙烯酰亚胺（PMI）泡沫为填料复合制备半互穿高频吸声材料。考察了水灰比、制孔剂掺入量和聚甲基丙烯酰亚胺（PMI）掺入量等因素对复合材料吸声性能的影响；采用驻波管、Micromeritics ASAP 2020仪器对样品的吸声系数、比表面积、孔容和孔径进行测试和表征；采用SEM观测了样品孔结构。实验结果表明：当水灰比为0.60，制孔剂0.04%，聚甲基丙烯酰亚胺（PMI）掺入量为6%时材料高频平均吸声系数为0.57，SEM显示吸声材料中石膏结晶自编织形成半互穿纤维多孔结构，孔隙分布均匀，孔型规整，其比表面积为26.0750 m3/g，孔容为0.971835221 m3/g，孔径为118.3581Å。%In this experiment, the high-frequency sound-absorbing material is based on the ordinary plaster, filled with the PMI foam. The experiment elucidates the factors of the water-cement ratio, sodium carbonate, and the incorporation of hydrochloric acid and PMI etc.on the absorption properties of composite materials. The wave tube and the Micromeritics ASAP 2020 are used to test and characterize the absorption coefficient, surface area, pore volume and pore diameter of the samples. The samples of the pore structure are observed by the JSM6460LV electron scanning microscope. The relationship between the configuration and the properties of the materials is discussed.
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