Treatment of PET nonwoven with a water vapor or carbon dioxide plasma
✍ Scribed by A. J. A. Klomp; J. G. A. Terlingen; G. A. J. Takens; A. Strikker; G. H. M. Engbers; J. Feijen
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 277 KB
- Volume
- 75
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Gas plasma treatment of poly(ethylene terephthalate) nonwoven (NW-PET) was used to increase the hydrophilicity of single-and multilayer NW-PET. NW-PET was treated with a pulsatile CO 2 or with a pulsatile H 2 O glow discharge. X-ray photoelectron spectroscopy (XPS) showed significantly more oxygen with CO 2 glow-discharge-treated NW-PET than with H 2 O glow-discharge-treated-NW-PET surfaces. Moreover, the introduction rate of oxygen at a single layer of NW-PET was higher for a CO 2 than for a H 2 O glow-discharge treatment. Titration data revealed significantly higher surface concentrations of carboxylic groups for CO 2 glow-discharge NW-PET than for H 2 O glow-discharge-treated NW-PET. Mass spectrometry analysis revealed that the entire internal surface of a single layer of NW-PET was modified. XPS and contact measurements confirmed the modification of the internal surface of multilayers of NW-PET. H 2 O and CO 2 glow-discharge-treated substrates consisting of six layers of NW-PET had a nonuniform surface concentration of carboxylic acid groups as determined with titration experiments. The outside layers of the substrate contained a higher surface concentration of carboxylic acid groups than did the inside layers. XPS analysis and titration data showed that the rinsing of H 2 O and CO 2 glow-dischargetreated NW-PET with water changed the surface composition considerably. Part of the carboxylic acid group-containing species were washed off.