Thiol-Functionalized Covalent Organic Frameworks as Thermal History Indictor for Temperature and Time History Monitoring |
| |
Authors: | Yujie Chen Yiping Song Zhen Zhang Yali Chen Qiliang Deng Shuo Wang |
| |
Affiliation: | 1. College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin, 300457 China;2. Tianjin Key Laboratory of Food Science and Health, School of Medicine, Nankai University, Tianjin, 300071 China |
| |
Abstract: | Various products, including foods and pharmaceuticals, are sensitive to temperature fluctuations. Thus, temperature monitoring during production, transportation, and storage is critical. Facile indicators are required to monitor temperature conditions via color changes in real time. This study aimed to prepare and apply thiol-functionalized covalent organic frameworks (COFs) as a novel indicator for monitoring thermal history and temperature abuse. The COFs underwent obvious color changes from bright yellow to purple after exposure to different temperatures for varying durations. The reaction kinetics are analyzed under isothermal conditions, which reveal that the order of reaction rates is k−20°C < k4°C < k20°C < k35°C < k55°C. The activation energy (Ea) of the COFs is calculated using the Arrhenius equation as 50.71 kJ moL−1. The COFs are capable of sensitive color changes and offer a broad temperature tracking range, thereby demonstrating their application potential for the monitoring of temperature and time exposure history during production, transportation, and storage. This excellent performance thermal history indicator also shows promise for expanding the application field of COFs. |
| |
Keywords: | color changes covalent organic frameworks food quality and safety thermal history time–temperature indicators |
|
|