Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 631, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2021.119333
Keywords
Microporous formation mechanism; PTFE fibers; Isotactic polypropylene; Microporous membranes
Categories
Funding
- National Natural Science Foundation of China [51873112]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51721091]
Ask authors/readers for more resources
The study revealed a new formation mechanism of PP microporous membranes, which utilizes the interface separation of PTFE fibers and PP matrix during stretching to create a microporous structure. Membranes fabricated using this method exhibited narrower pore size distribution, higher porosity, higher N2 flux, and pure water flux compared to beta-PP membranes.
Studying microporous formation and evolution mechanism plays a crucial role in fabricating high-performance microporous membranes. A formation mechanism of PP microporous membranes, different from those reported previously, was proposed based on the interface separation of PTFE fibers and PP matrix during sequential biaxial stretching. The experimental results indicated that the initial microcracks, which were filled by microfibrillated PP, were originated from PTFE fibers-PP matrix interfaces perpendicular to the longitudinal stretching direction. As the strain increased, microfibrillated PP was further elongated, ultimately forming microfibrillated PP membranes at a relatively low strain (200%). The subsequent transverse stretching caused the separation of fibrillated PP to form an excellent microporous structure. As a result, PTFE/PP membranes after biaxial stretching exhibited the narrower pore size distribution, higher porosity, higher N2 flux and pure water flux than beta-PP membranes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available