二乙炔类时间温度指示剂

Diacetylenic Time-Temperature Indicators

二乙炔类时间温度指示剂自身具有特殊的炔键结构,在受到外界温度、光线辐射等能量刺激后会发生分子间炔键聚合反应,引起指示剂颜色变化。这种颜色变化具有时间温度累积效应,因此将该指示剂用于产品外包装时,可通过观察其颜色来判断产品经历的热历程以及产品质量是否合格。本文简单介绍了二乙炔类时间温度指示剂的指示原理,并详细分析了二乙炔的分子结构,探讨了不同取代基对其性质的影响,对该类指示剂的变色影响因素进行了讨论,最后对其应用作了简单回顾。

Diacetylenic time-temperature indicator （TTI）, which possesses at least a pair of accumulative triple bond, may polymerize into double bond in its solid state when exposed to high temperature, light irradiation or any other energy stimulations, meanwhile, it shows a series of color or color density change during this process. Therefore, TTI can be used for product package to indicate the accumulated time-temperature history of the product. The latest advances in diacetylenic time-temperature indicators are reviewed in this paper. Their structures, physicochemical properties, photochromic mechanism, impact factors of color change and applications are further expounded.