Application of thermochromic colorants on textiles: temperature dependence of colorimetric properties

Abstract

Commercial thermochromic colorants were applied to a conductive cotton fabric prepared by using nichrome/cotton core‐spun yarns in weft and 100% cotton in warp. The fabrics were pretreated and coloured with thermochromic pigments in isolation, in combination with each other, or in a mixture with a non‐thermochromic pigment. The weft yarns were joined to allow passage of current through the fabric to enable ohmic heat generation to increase fabric temperature. The heat generation and temperature rise could be controlled by monitoring the voltage applied. The colour of the samples changed gradually with an increase in temperature, and significantly so when the temperature of the fabric rose beyond the activation temperature of the thermochromic colorant. The temperature‐dependent properties of commercial thermochromic colorants were determined using a spectrophotometer. Wash fastness of the samples was found to be fair in all cases except with the yellow colorant. Predetermined colour effects, such as camouflage or novel design, can be produced by combining thermochromic colorants with conventional pigments or thermochromic colorants with different activation temperatures.

Epidermal photonic devices for quantitative imaging of temperature and thermal transport characteristics of the skin

“…They also thermally load the skin and cause irritation at the skin interface, thereby preventing reliable, accurate evaluation or use in continuous modes over long periods of time. Thermochromic textiles are available for cosmetic and fashion purposes [29][30][31] but their inability to maintain intimate contact with the skin and the limited capacity to use known thermochromic dyes for precision temperature evaluation prevent their use in the sorts of applications envisioned here. The devices reported in this paper not only avoid these drawbacks but they also allow precise measurement of thermal conductivity and thermal diffusivity through analysis of spatio-temporal images obtained during operation of integrated RF components.…”

Sıcaklığa Duyarlı Derilerin Yaşlanma Davranışları

“…Besides, four different proportions (15,20,50 and 70 units) were used with and without cross-linker application at the top coat of the finishing procedure to improve the fastness properties of thermochromic leathers (Table 1) [4].…”

Preparation of poly(methyl methacrylate‐co‐ethylene glycol dimethacrylate‐co‐glycidyl methacrylate) walled thermochromic microcapsules and their application to cotton fabrics

“…Thermochromic materials are intriguing substances, which exhibit reversibly color change depending on change of temperature . Because of their temperature sensing property, thermochromic materials have attracted considerable interest and are tested to determine their potential in many products and application areas like thermal indicators, optical storage devices, other luminescent switches, building coatings and cement, security printing plastic strip thermometers, food packaging, medical thermography, nondestructive testing of engineered articles, electronic circuitry, and pharmaceutical industry . Recently, textile industry has become one of the most interested sectors to thermochromic materials.…”

“…However, the usage of these materials in textile applications is far less widespread due to the lack of investigations. With the reproducibility of reversible color change properties, thermochromic systems (TSs) gradually began to take place among the important materials in the production of functional and smart textiles …”