Study on pore size distribution method of SBA-15 in polymer composites

Ordered mesoporous materials are one of the mesoporous materials with a pore diameter of 2–50 nm. They are a new kind of materials with uniform pore size, highly ordered nanopores and high specific surface area. SBA-15 is a typical ordered mesoporous material. In addition, polymeric composites based on SBA-15 have been widely used in many fields. At present, the characterization of the pore structure of SBA-15 is usually obtained by chemical or physical experiments. However, due to many uncertain factors in the experiment process, it is impossible to know whether the sample meets the experimental conditions before detecting it. The trial and error cost in this process is too high, and repeated measurement experiments will greatly damage the pore structure. In this paper, using computer to simulate the pore size distribution of SBA-15 based on the pore size distribution maps of SEM and TEM images. Firstly, the image is segmented by threshold, then the aperture data are obtained by the maximum inscribed circle algorithm, and finally the probability density curve of aperture distribution is obtained by a statistical method. The results show that the aperture probability density curve obtained by this method is more similar to the real aperture distribution curve. This method provides a reference for reducing the experimental cost in the process of preparing SBA-15.