Recent literature reported an increasing number of papers related to pH-sensitive materials because of their broad range of applications as sensors systems [1,2]. Among these materials, textiles with halochromic properties are having a significant attention due to their flexibility, mechanical properties, lightweight and washability. These properties allow to produce wearable pH sensitive devices, that might be employed in a wide range of applications [3], like for example in wound dressing to indicate the progress of wound healing; or in water filtration as well as in agriculture to monitor the pH of soil. Finally, a color-changing textile can have an interest in house applications including curtains, tablecloths, and bed linen. The manuscript shows the possibility to dye textile fabrics with halochromic dyes. Five different halochromic dyes were tested:Bromocresol Purple, m-Cresol Purple, Chlorophenol Red, Curcumin and Bromothymol Blue. The dyeing recipe was applied on a multifibers textile fabrics composed of wool, acrylic, polyester, polyamide 6.6, cotton and acetate, to test the affinity of different fibers for the dyes. The dyes were solubilized in a water solution and the dyeing bath was heated at 100°C for 40 min. Washing and light fastness of the dyed fabrics were evaluated, as well as color changing at different pH. Some fibers, polyamide 6.6 and wool in particular, showed a good fastness of the dye and halochromic properties. Bromothymol Blue was selected to dye polyamide 6.6 and cotton fabrics. Cotton required a mordant application step before the dyeing. Both cotton and polyamide 6.6 evidenced good halochromic properties in a pH range from 4 to 10. Cotton fabrics exhibited an immediate color changing; polyamide 6.6 changed color after few minutes, and the color transition was faster as temperature increased. On the other hand, cotton fabrics showed a poor light and washing fastness, while polyamide 6.6 evidenced a good dyes fastness. Figure 1 reports the results of the halochromic test on cotton fabrics.
Textile fabrics dyeing to confere halocromic properties
Cinzia Tonetti;Claudia Vineis;Alessio Varesano
2019
Abstract
Recent literature reported an increasing number of papers related to pH-sensitive materials because of their broad range of applications as sensors systems [1,2]. Among these materials, textiles with halochromic properties are having a significant attention due to their flexibility, mechanical properties, lightweight and washability. These properties allow to produce wearable pH sensitive devices, that might be employed in a wide range of applications [3], like for example in wound dressing to indicate the progress of wound healing; or in water filtration as well as in agriculture to monitor the pH of soil. Finally, a color-changing textile can have an interest in house applications including curtains, tablecloths, and bed linen. The manuscript shows the possibility to dye textile fabrics with halochromic dyes. Five different halochromic dyes were tested:Bromocresol Purple, m-Cresol Purple, Chlorophenol Red, Curcumin and Bromothymol Blue. The dyeing recipe was applied on a multifibers textile fabrics composed of wool, acrylic, polyester, polyamide 6.6, cotton and acetate, to test the affinity of different fibers for the dyes. The dyes were solubilized in a water solution and the dyeing bath was heated at 100°C for 40 min. Washing and light fastness of the dyed fabrics were evaluated, as well as color changing at different pH. Some fibers, polyamide 6.6 and wool in particular, showed a good fastness of the dye and halochromic properties. Bromothymol Blue was selected to dye polyamide 6.6 and cotton fabrics. Cotton required a mordant application step before the dyeing. Both cotton and polyamide 6.6 evidenced good halochromic properties in a pH range from 4 to 10. Cotton fabrics exhibited an immediate color changing; polyamide 6.6 changed color after few minutes, and the color transition was faster as temperature increased. On the other hand, cotton fabrics showed a poor light and washing fastness, while polyamide 6.6 evidenced a good dyes fastness. Figure 1 reports the results of the halochromic test on cotton fabrics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
