Titre :
|
A comparison of the oil, oxygen, and water-vapor permeation rates of various polyethylene blown films
|
Auteurs :
|
J. Krohn ;
D. Jordy
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1997
|
Format :
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p.151-155
|
Langues:
|
= Anglais
|
Catégories :
|
MATERIAUX
|
Mots-clés:
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POLYMERE
;
POLYETHYLENE
;
PERMEABILITE
;
ABSORPTION
|
Résumé :
|
Melt-blown filter media containing antimicrobial compounds were evaluated for mechanical properties, filtration efficiency, and ability to prevent bacterial growth on the filter. The filters were challenged with gram-negative and gram-positive bacteria grown on agar at three levels of pH and incubated at 25 degrees C and 37 degrees C for 24 h and 48 h. Antimicrobial Compound A prevented growth of the gram-positive Staphylococcus aureus bacteria at pH 4.8 Compound A was ineffective against the gram-negative Klebsiella pneumoniae bacteria at any pH. Compound B had no effect on bacterial growth. Compound C prevented growth of gram-negative and -positive bacteria at all pH levels. The antimicrobial compounds were nucleating agents, producing slight increases in crystallinity temperature, modulus, tensile strength, and stress-at-break and a decrease in elongation-at-break. Fiber diameter increased with increasing concentrations of antimicrobial compounds. Filtration efficiency decreased with increasing fiber diameter.
|
Source :
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Tappi journal, vol 80, n°3
|