Journal
JOURNAL OF ELECTROSTATICS
Volume 72, Issue 4, Pages 311-314Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.elstat.2014.05.006
Keywords
Electret; Melt-blown polypropylene; Charge decay; Filtration efficiency degradation; Solubility parameter
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Funding
- National Natural Science Foundation of China [51177032]
- Special Support Project of Education Bureau of Zhejiang Province, China [Z201018028]
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Melt-blown polypropylene electret fabrics are widely used as air filter media: However, its filtration efficiency gradually decays in application process. This paper is to investigate the correlation between filtration efficiency decay and solvent effect. Experimental results show that filtration efficiency displays a regular decrease when polypropylene electret fabrics are exposed to solvents in the sequence of water, ethanol, isopropanol and acetone. The results can be correlated to solubility parameter difference between polypropylene and solvent according to the Flory-Huggins swelling theory. Smaller solubility parameter difference leads to greater decay of filtration efficiency owing to greater affinity between polypropylene and solvent (C) 2014 Elsevier B.V. All rights reserved.
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