JOURNAL of the JAPAN RESEARCH ASSOCIATION for TEXTILE END-USES
Online ISSN : 1884-6599
Print ISSN : 0037-2072
ISSN-L : 0037-2072
Detergency and Soiling of Polyethylene Terephthalate Fabrics Treated with Sulfuric Acid Aqueous Solution
Yoichiro MuraokaMasako OkaMasako TsujiiTakashi YamazakiTakeo Sone
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JOURNAL FREE ACCESS

1993 Volume 34 Issue 4 Pages 196-202

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Abstract

The surface of polyethylene terephthalate plain-woven fabric (PET) was sulfonated by reaction with sulfuric acid aqueous solutions having concentrations of 69, 72 and 75%. It was confirmed that the aliphatic and aromatic sulfonic acid groups were formed on the surfaces of the treated fabrics by FTIR-ATR method. The flexural rigidity of treated PET altered very little.
The detergent efficiency after soiling in lamp black particles dispersed in CCl4solution was 44.0% and 64.5% before and after the treatment, respectively. The soiling ratio in a 1×10-2% concentration lamp black particles dispersed in detergent solution was decreased from 31.6% to 8.0% by treatment.
These detergency and soiling results obtained were attributed to the interfacial electrical property. The zeta-potential of the treated PET fabrics increased a negative charge from -10.0mV to around -20.0mV and a negative charge of lamp black particles was -56.0mV. The difference zeta potential between the PET fabrics and the lamp black particles lowered, and so a repulsive force between the two strengthened after the treatment. It was considered that the remarkable improvement of the detergency and soiling of the treated PET fabrics originated in the zeta-potential change.
The fiber surface damage during the treatment, however, affected the detergency and soiling more effective than the electrostatic effect. The fiber surface damage and fabrics structure were detected by SEM using twill-woven cationic dyeable polyester and plain-woven cotton fabrics. The former soiled easily than the latter did, but the detergent efficiency of the former was higher than that of the latter.

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