Applicability of Nylon 66 Fabric Dyed with Bromocresol Green as Textile Chemosensor

• Published in: Fibers and polymers 2022, 23(3), , pp.751-758
• Main Authors: Lee, Da Eun, Yoo, Hyun Woo, Lee, Jung Jin
• Format: Article
• Language: English
• Subjects: Absorption; Aqueous solutions; Chemical sensors; Chemistry; Chemistry and Materials Science; Chemoreceptors; Color; Dyeing; Dyes; Halochromism; Hydrochloric acid; Nylon 66; Polymer Sciences; Sulfuric acid; Textile composites; Woven fabrics; 섬유공학
• ISSN: 1229-9197; 1875-0052
• DOI: 10.1007/s12221-022-3066-y

Strong acids, such as hydrochloric acid and sulfuric acid, are colorless and are not easily detected when leaked by accident. A chemosensor using halochromic dye can provide a simple and easy detecting method by exhibiting different color when it is exposed to liquid acids. In this study, bromocresol green was used as a pH-indicating dye in detecting liquid acids. Nylon 66 woven fabrics were dyed with bromocresol green and the dyeing properties were investigated. pH sensing property was also investigated by immersing the dyed nylon fabric in acidic solutions. Bromocresol green in an aqueous solution showed maximum absorption at 445 nm with yellow color at a pH of 2–4, whereas the maximum absorption changed to 616 nm showing blue color at a pH above 6. Color yield and exhaustion of bromocresol green on nylon 66 were highly dependent on the dyebath pH. When yellow sample, which was dyed at pH 3 or less, was immersed in a solution of a pH range of 2.0–3.5, its original orange color was maintained, whereas the color turned blue when immersed in a solution of a pH range of 4.0–5.5. On the contrary, blue sample was obtained when dyed at pH 4 or more. When the sample was immersed in a solution of pH 2.0–3.5, the color was markedly changed into yellow and showed a big color difference. Wash fastness of the fabric dyed at pH 4 was good to excellent. The results suggest that nylon 66 fabric dyed with bromocresol green may be used as a textile sensor.