Abstract A durable and tunable multiple-color thermochromic natural silk is prepared with vinyl modified thermochromic pigments (VTPs) by thio-ene reaction. The VTPs is obtained by the hydrolysis-polycondensation between the siloxane groups of trietoxyvinylsilane (VTEO) and the hydroxy groups of thermochromic pigments (TP). The reversible thermochromic properties of VTPs perform well in the heating-cooling cycle. The color of VTPs gradually fades during heating, and returns to its origin color when cooled. Its thermal decomposition temperature is up to 272 ℃. The vinyl of VTPs can react with sulfhydryl of 3,3′,3′'-phosphinetriyltripropanoic acid hydrochloride (TCEP) treated silk fabrics and form covalent bonding between vinyl groups and sulfhydryl groups via thio-ene reaction. The color of fabricated thermochromic silk fabrics changes reversibly during heating and cooling cycles, which is consistent with the color change behaviors of VTPs. The sulfhydryl-vinyl covalent bonds formed between silk fibers and VTPs provide good washing fastness (3−4 grade) and rubbing fastness (3 grade). By combining thermochromic pigments with different color and transition temperatures, thermochromic silk fabrics with the features of multiple-color change, various responsive temperatures and continuous color change are fabricated, making it highly promising for smart textile application.

中文翻译：

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用活性热致变色颜料制成的耐用且可调的温度响应丝绸

摘要 以乙烯基改性热致变色颜料（VTPs）为原料，通过硫烯反应制备了一种耐用且可调的多色热致变色天然蚕丝。VTP 是通过三乙氧基乙烯基硅烷 (VTEO) 的硅氧烷基团与热致变色颜料 (TP) 的羟基之间的水解缩聚反应获得的。VTP 的可逆热致变色特性在加热-冷却循环中表现良好。VTP 的颜色在加热过程中逐渐褪色，冷却后恢复到原来的颜色。其热分解温度高达272℃。VTPs的乙烯基可以与3,3',3''-次膦三基三丙酸盐酸盐（TCEP）处理的丝织物的巯基反应，并通过硫烯反应在乙烯基和巯基之间形成共价键。在加热和冷却循环过程中，制成的热致变色真丝织物的颜色发生可逆变化，这与 VTP 的颜色变化行为一致。蚕丝纤维与VTPs之间形成的巯基-乙烯基共价键提供了良好的水洗牢度（3-4级）和摩擦牢度（3级）。通过结合不同颜色和转变温度的热致变色颜料，制造出具有多色变化、各种响应温度和连续变色等特点的热致变色真丝织物，使其在智能纺织应用中极具前景。