In this paper, two polypropylene (PP)/carbon black (CB) films containing 2. 2％ and 3. 3％ of carbon black(CB) contents were prepared by melt blending - masterbatch dilution method assisted with high-efficiency dynamic mixer. Based on scanning electron microscopy(SEM) and optical microscopy(OM) images, the image analysis software, Image J, was firstly used to quantitatively characterize the dispersion and distribution of CB particles. The results of SEM analysis showed that the average area of CB particles was 0. 220 μm2 and the area distribution strictly conforms to exponent decay distribution. The results of OM analysis indicated that a small amount of CB agglomerates appeared when the CB content reached up to 3.3％. The dispersion index (D) of films with 2. 2％ and 3.3％ of CB were 0. 75 and 0. 5, respectively, which indicated that high CB content was not conducive to CB dispersion. Furthermore, the average area of particles (0. 209 μm2 ) in film with low CB content was less than that(0. 220 μm2) in film with high CB content. However, their area distributions showed a great similarity and they both conformed to exponent decay distribution strictly. The results of OM were consistent withthat of SEM. The image analysis software, Image J, can convert qualitative information into quantitative information and characterize comprehensively the dispersion of CB particles in polymeric matrix by combination with the dispersion indexes.%采用熔融共混-母粒稀释技术,辅以高效动态混合器制备了炭黑含量为2.2%与3.3%的两种聚丙烯/炭黑薄膜.基于扫描电镜(SEM)与光学显微镜(OM)图像,首次利用Image J图像分析软件定量表征了炭黑在薄膜中的分散与分布.SEM分析结果表明,炭黑含量为2.2%的膜中粒子的平均面积为0.220 μm2,且面积严格服从指数分布;OM分析结果表明,当炭黑含量为3.3%时,膜中出现了少量团聚体.经计算,制备的两种薄膜中粒子分散指数(D)分别为0.75和0.5,表明高炭黑含量不利于粒子分散.此外,OM图片显示低炭黑含量膜中的粒子平均面积(O.209 μm2)略小于高炭黑含量膜(0.220 μm2),且面积分布呈极大的相似性,均严格服从指数分布.Image J图像分析软件可将SEM与OM图像所携带的定性信息转化为定量信息.并可结合分散指数综合表征炭黑在聚合物基体中的分散性.
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