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以气体穿过聚合物的曲折因子τ的计算模拟了LMPM／PP复合材料的透气性与分散相LMPM形态结构的关系。用常规方法测定TLMPM／PP复合材料对水气的相对渗透系数，探讨了LMPM／PP复合材料的透气性与LMPM用量以及加工工艺的关系、结果证明，当LMPM体积分数少于30％时，只进行混炼，LMPM／PP复合材料的透气性接近按球形分散相模拟的结果；当LMPM用量少于20％时．先混炼再挤出所制复合材料的透气性接近按纤维分散相模拟的结果。LMPM用量较多时，透气性显著下降。SEM照片显示，混炼时，LMPM超细分散成粒子状；混炼又挤出时，LMPM以纤维状分散于基体之中；这与透气性测定预示的结构相同。测定复合材料的透气性是了解复合材料形态结构的重要手段。
The calculation of the tortuosity τ of the gas through the polymer simulates the relationship between the air permeability of the LMPM / PP composites and the morphology of the dispersed phase LMPM. The relative permeability coefficient of TLMPM / PP composites to water and gas was determined by the conventional method. The relationship between the permeability of LMPM / PP composites and the amount of LMPM and the processing technology was also discussed. The results show that when the volume fraction of LMPM is less than 30% For mixing, the permeability of LMPM / PP composites was close to that of spherical disperse phase. When the amount of LMPM was less than 20%, The air permeability of the composites mixed and re-extruded first was close to that of the fiber dispersed phase. When the amount of LMPM is high, the air permeability is significantly decreased. The SEM images showed that the LMPM was finely dispersed in the form of particles when it was kneaded. In the kneading and extrusion, the LMPM was dispersed in the matrix in the form of fibers; this was the same structure as the gas permeability measurement. Determination of the permeability of the composite material is an important means to understand the morphology and structure of the composite material.