FEP flat-sheet membranes were fabricated by hot pressing method with FEP as membrane forming polymer

composite inorganic particles (including micro/nano scale SiO2

NaCl particles and interfacial treatment agent) as pore forming agent and dioctyl phthalate (DOP) as plasticizer.FEP hybrid flat-sheet membrane is a kind of homogeneous microporous membrane with interfacial pore structure.How the content of composite inorganic particles influence the structure and performance of FEP flat membrane is investigated in this article.Membranes' corresponding performances were characterized in terms of penetration

rejection rate

porosity and mechanical properties.The result showed that only a few inorganic particles were distributed in the surface of FEP hybrid membranes and most of them were surrounded by matrix.Due to the low surface energy

FEP is easily separated with inorganic particles forming pore structure.With the increase of inorganic particles

the number of pores increased

meanwhile the permeability and porosity increased

while the rejection ratio of carbonic ink decreased

and the mechanical properties of membranes first increased and then decreased.