Abstract
Thermochromic materials are of great interest because of their color transition characteristic as a function of temperature, and this property may find potential applications as a temperature indicator. Irreversible thermochromic materials that display color change at low temperatures can be utilized as a temperature indicator to ensure the safety and quality of deep-frozen products during storage and transportation. In this work, we have successfully prepared a novel colorimetric sensor based on a functionalized polydiacetylene dye. In order to achieve thermochromic transition in different temperature ranges, pentacosadiynoic acid (PC) was functionalized with ethylene glycol monomethylether (EGME), diethylene glycol monomethyl ether (DGME) and triethylene glycol monomethyl ether (TGME), resulting the formation of ester head groups. Photopolymerization of the synthesized diacetylene dyes was carried out to convert the monomers of the dyes into polymers. The Fourier transform infrared spectroscopy (FTIR), Nuclear magnetic resonance (NMR), and Raman spectroscopy were used to characterize the synthesized product. The absorption spectroscopy and optical images study revealed that the functionalized dyes underwent irreversible thermochromic transition when exposed to freezing temperatures. This property of irreversible color transition can make them a reliable indicator of temperature change. The functional dye was incorporated into a polymer film to apply directly on deep freeze products as a polymer strip and when the temperature increases upon freezing level, the color of the thermochromic strip changes which can provide a visual warning to the consumers and manufacturers.
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Abbreviations
- PC:
-
10,12-Pentacosadiynoic acid
- PCE:
-
10,12-Pentacosadiynoate-ethylene glycol monomethyl ether
- PCD:
-
10,12-Pentacosadiynoate-diethylene glycol monomethyl ether
- PCT:
-
10,12-Pentacosadiynoate-triethylene glycol monomethyl ether
- PPCE:
-
Poly(10,12-Pentacosadiynoate-ethylene glycol monomethyl ether) (before thermal treatment)
- PPCD:
-
Poly(10,12-Pentacosadiynoate-diethylene glycol monomethyl ether) (before thermal treatment)
- PPCT:
-
Poly(10,12-Pentacosadiynoate-triethylene glycol monomethyl ether) (before thermal treatment)
- TPPCE:
-
Poly(10,12-Pentacosadiynoate-ethylene glycol monomethyl ether) (after thermal treatment)
- TPPCD:
-
Poly(10,12-Pentacosadiynoate-diethylene glycol monomethyl ether) (after thermal treatment)
- TPPCT:
-
Poly(10,12-Pentacosadiynoate-triethylene glycol monomethyl ether) (after thermal treatment)
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Acknowledgements
The authors thank the CSIR-CSIO (OLP-247) for financial assistance. Sachin [25/CSIR-UGC NET JUNE 2019] and Deepika [201610203672] are also thankful to CSIR-UGC for JRF fellowship support. Authors are also grateful to the Director, CSIR-CSIO, for providing his support during this work.
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CSIR-CSIO (OPL247).
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SG visualization, experimental work, writing original draft, data interpretation, formal analysis, validation, conceptualization. DS data curation, software, formal analysis, and validation. KK review, editing, supervision, conceptualization, resources, funding, and acquisition.
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Goyal, S., Sharma, D. & Kumar, K. Synthesis of low-temperature irreversible thermochromic indicator based on functional polydiacetylene for food storage applications. J Mater Sci 59, 7561–7573 (2024). https://doi.org/10.1007/s10853-024-09637-x
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DOI: https://doi.org/10.1007/s10853-024-09637-x