A sultone‐based reversible dark red‐yellow conversion thermochromic colorant with adjustable switching temperature. (12th November 2018)

• Record Type: Journal Article
• Authors: Zhang, Wan; Ji, Xiaoqian; Zeng, Chanjuan; Yin, Yunjie; Wang, Chaoxia
• Is Part Of: Coloration technology. Volume 135:Number 2(2019)
• Page Start: 97
• Page End: 102
• Publication Date: 2018-11-12
• Subjects: Color -- Periodicals; Color in the textile industries -- Periodicals; Dyes and dyeing -- Periodicals; 667
• DOI: 10.1111/cote.12380
• Languages: English
• ISSNs: 1472-3581

Abstract

Abstract : A reversible, adjustable thermochromic colorant with bichromatic conversion from dark red (cool state) to yellow (heat state) was prepared using bromocresol purple (BCP) as colour former. The thermochromic behaviour of this colorant was investigated during the heating‐cooling cycle, including the colour depth, colour difference and switching temperature. The mechanism of thermochromic colorant switching between dark red and yellow originated from the transformation of the conjugated structures of BCP, which was confirmed by infrared spectrometry. The switching temperature can be flexibility adjusted between 13–46 °C by mixing solvents according to Schröder's equation, which was demonstrated by differential scanning calorimetry measurement. The thermochromic colorant presented good reversible thermochromic performance with stable changes in colour parameters for 50 heating‐cooling cycles. This sultone‐based reversible dark red‐yellow conversion thermochromic colorant is suitable for application as thermal‐indicating material under various conditions.