Abstract:

A novel process named “wrapping method” was put forward to deal with contradiction between the pore size and porosity manipulations in polytetrafluoroethylene (PTFE) hollow fiber membrane manufacturing, which can be applied to fabricate the asymmetric structures and PTFE wrapped hollow fiber membrane with small micropore and high porosity. In addition, physical entanglement of hydrophilic agent on the surface of fibrils and nodes was utilized to achieve surface hydrophilic modification, leading to an excellent wettability and wider application in water treatment.

Key words: polytetrafouoroethylene, wrapping, hydrophilic modification, microfiltration, hollow fiber membrane