期刊
MEMBRANES
卷 12, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/membranes12080733
关键词
mesoporous membanes; high-density polyethylene; ozonation; hydrophilization; surface modification
类别
资金
- Ministry of Science and Higher Education of the Russian Federation [075-15-2020-794]
This study addresses the hydrophilization of hydrophobic mesoporous HDPE membranes through ozone treatment, improving their wettability and water permeability. Ozone treatment smoothes the surface relief of the membranes and introduces new functional groups.
This work addresses hydrophilization of hydrophobic mesoporous membranes based on high-density polyethylene (HDPE) via ozonation. Mesoporous HDPE membranes were prepared by intercrystallite environmental crazing. Porosity was 50%, and pore dimensions were below 10 nm. Contact angle of mesoporous membranes increases from 96 degrees (pristine HDPE) to 120 degrees due to the formation of nano/microscale surface relief and enhanced surface roughness. The membranes are impermeable to water (water entry threshold is 250 bar). The prepared membranes were exposed to ozonation and showed a high ozone uptake. After ozonation, the membranes were studied by different physicochemical methods, including DSC, AFM, FTIR spectroscopy, etc. Due to ozonation, wettability of the membranes was improved: their contact angle decreased from 120 degrees down to 60 degrees, and they became permeable to water. AFM micrographs revealed a marked smoothening of the surface relief, and the FTIR spectra indicated the development of new functionalities due to ozonolysis. Both factors contribute to hydrophilization and water permeability of the ozonated HDPE membranes. Hence, ozonation was proved to be a facile and efficient instrument for surface modification of hydrophobic mesoporous HDPE membranes and can also provide their efficient sterilization for biomedical purposes and water treatment.
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