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- Niemi, MEK, et al.
(författare)
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- 2021
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swepub:Mat__t
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- Cho, DL, et al.
(författare)
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Composite membranes formed by plasma-polymerized acrylic acid for ultrafiltration of bleach effluent
- 1993
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Ingår i: Journal of Applied Polymer Science. - 0021-8995 .- 1097-4628. ; 47, s. 2125-2133
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Tidskriftsartikel (refereegranskat)abstract
- Composite membranes were formed by deposition of plasma-polymerized acrylic acid (PPAA) films onto porous commercial membranes to improve the rejection, especially of chlorinated compunds, in ultrafiltration of E-stage bleach effluent. Although increased rejections were accompanied by reduced flux, in most cases, the reductionswere not significiant considering the extent of increased rejections. A good composite membrane showed the AOX removal of 94% (76% before the modification) and the chemical oxygen demand (COD) removal of 84% (67% before the modification) with 33% reduction of the flux. The permeate was optically clean. The improved rejection is attributed to the tightly crosslinked network of a plasma polymer film and its negatively charged surface. Ultrathin film thickness and the hydrophilic property of a plasma polymer film minimize the reduction of flux.
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- Cho, DL, et al.
(författare)
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Plasma treatment of wood
- 1990
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Ingår i: Journal of Applied Polymer Science. - 0021-8995 .- 1097-4628. ; 46, s. 461-472
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Tidskriftsartikel (refereegranskat)abstract
- Wood was treated with hydrophobic plasma polymers to reduce the water penetration. Due to the released water vapour and/or molecular weight components from wood under low pressures the efficiency of the plasma treatment was dependent on the evacuation time before plasma treatment. A long evacuation for the efficient treatment could be avoided by increasing the monomer pressure. Adhesion of a paint onto the hydrophobized wood was poor. The adhesion was improved by hydrophilic post-treatment at a sacrifice of the reduction of water penetration. However, a large reduction of water penetration and a good adhesion to a
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- Cho, DL, et al.
(författare)
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Structure and surface properties of plasma polymerized acrylic acid layers
- 1990
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Ingår i: Journal of Applied Polymer Science. - 0021-8995 .- 1097-4628. ; 41, s. 1373-1390
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Tidskriftsartikel (refereegranskat)abstract
- Thin plasma polymerized layers of acrylic acid (PPAA) were deposited onto polyethylene and muscovite mica surfaces. Structure and surface properties of the deposited layer depend on the polymerization conditions. The content of carboxylic groups in the layer decreases, whereas the degree of crosslinking or branching increases, with increasing discharge power. A soft, sticky layer with a low contact angle against water is obtained when a low discharge power (5 W) is used. In contrast, a hard film with a rather high water contact angle is obtained when the discharge power is high (50 W). A surface force apparatus was employed to study some film properties including adhesion force, crack formation, and capillary condensation. The adhesion force between plasma polymerized acrylic acid layers prepared at a low discharge power is high in dry air. It decreases remarkably in humid air and no adhesion is observed in water. In dry air, the adhesion force between PPAA layers decreases as the discharge power increases.
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