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SEM Image Analysis of Pore Structure of Extending PTFE Membrane
Chen Shanmei*
Key Laboratory of Separation Membrane and Applied Technology, Ningbo University, Ningbo 315211
Abstract:
The pore structure of extending PTFE(e PTFE) membrane by the stretching method is much different from other polymers. The image analysis of Scanning Electron Microscope(SEM) was used to describe the fiberized PTFE molecular and the coagulated PTFE node. The interconnected notes and fibrils were defined as numerical parameters, LF, WF, LN, WN and AN. The results by description of the SEM image analysis were corresponding with the porosity Pr and density Pf in the combination method of bubble pressure and fluid permeability used in other microporous membranes. The membrane with bigger AN images of node gave larger Pf and smaller Pr, and membrane with smaller AN images showed smaller Pf and bigger Pr. However there was no certain relationship with r or rmax. It is said that the SEM image analysis can be used as one of the methods to describe the pore performance of e PTFE membrane. Moreover, the influences of molecular weight of PTFE, and the stretching ratio at mechanical operation on e PTFE pore structure could also be interpreted by the SEM image analysis. The bigger molecular weight of raw material PTFE, the higher porosity and strength of the membrane would be found. The less stretching ratio, the bigger crystal node and the shorter fibril SEM image were observed.
Key words:  e-PTFE microporous membrane, Scanning electron microscope, Image analysis
FundProject:
膨体聚四氟乙烯微孔滤膜孔结构的扫描电镜图像解析
陈珊妹*
宁波大学分离膜材料与应用技术重点实验室,宁波,315211
摘要:
由拉伸法制得的膨体聚四氟乙烯(e-PTFE)微孔滤膜,其孔结构与其他高分子材质膜截然不同.运用扫描电镜(SEM)图像解析方法描述纤维化的PTFE分子和相互连接的PTFE积聚分子结点,膜的孔性能分别以数字量化的参数: LF、 WF、 LN、 WN、 AN表示.测试结果与一般微孔滤膜常用泡压-滤速法测定表示孔性能的表观密度和孔隙率有对应关系,说明SEM图像解析可作为表征e-PTFE膜孔结构的方法之一.此外,图像解析还可显示原料PTFE分子量和机械操作中的拉伸比对生产的e-PTFE膜孔结构的影响
关键词:  e-PTFE微孔膜  扫描电镜  图像解析
DOI:10.1088/1674-0068/18/2/228-232
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