Structure Control of polymeric porous Membranes by Mechanical Operations

1997 Fiscal Year Final Research Report Summary

• Project/Area Number: 08455354
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: 化学工学一般
• Research Institution: KYOTO UNIVERSITY
• Principal Investigator: TANIGAKI Masataka Kyoto University, Department of Chemical Engineering, Professor, 工学研究科, 教授 (30027148)
• Co-Investigator(Kenkyū-buntansha): KURUMADA Ken-ichi Kyoto University, Department of Chemical Engineering, Instructor, 工学研究科, 助手 (80273473) ; OSHIMA Masahiro Kyoto University, Department of Chemical Engineering, Associate Professor, 工学研究科, 助教授 (60185254)
• Project Period (FY): 1996 – 1997
• Keywords: PTFE microparticle / stretching operation / porous structure / fibril structure / porosity / period / general-purpose / stretching temperature

Research Abstract

A porous structure was shown to be formed by a stretching operation on the assembled PTFE microparticles into a sheet at a high pressure. The porous structure was well characterized by a periodical cycle, which was varied along several typical parameters of the mechanical operations. The porosity was greatly enhanced by the two-step stretching operation done in two directions perpendicular to each other. The porous structure was provided as a slit-like void between two adjoining fibril structures yielded in parallel with the first stretching operation. The physical process of the stretching operation was simplified into a rheological model and the formation of the fibril structure was discussed in a close relation with the molecular structure of the starting PTFE material. The stretching operation was also attempted to a general-purpose polymer (PE) and an accurate temperature control in the stretching operation was revealed to be indispensable.