Polydiacetylene/Poly(vinyl alcohol) Composite Films as a Low-Temperature Irreversible Indicator for Drug Storage Applications,ACS Applied Polymer Materials

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Polydiacetylene/Poly(vinyl alcohol) Composite Films as a Low-Temperature Irreversible Indicator for Drug Storage Applications
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2024-03-29 , DOI: 10.1021/acsapm.4c00136
Sachin Goyal _{1,

2} , Deepika Sharma _{1,

2} , Akash Deep ₃ , Kamlesh Kumar _{1,

2,

4} , Amit L. Sharma _{1,

2}

Affiliation

In this work, the application of a composite film of polydiacetylenes (PDAs) with poly(vinyl alcohol) (PVA) is reported as an irreversible low-temperature indicator for frozen food and pharmaceutical items. The thermochromic dyes, i.e., functionalized diacetylenes (DAs), were synthesized using the Steglich esterification of 10,12-pentacosadiynoic acid with different aliphatic alcohols (linear and branched chains). The synthesized PDAs show irreversible thermochromic behavior at low temperatures (above 7 °C) because of the lack of intermolecular interactions on the side head groups. Furthermore, composite films are fabricated by incorporating functionalized monomers into the polymer matrix. Monomeric DAs undergo polymerization under UV exposure, forming PDAs within composite films. Different analytical techniques have been used to confirm the formation of the functionalized DA ester moieties. During thermochromic studies, low-temperature color transition (above 7 °C) is achieved by functionalization of head groups with different aliphatic alcohols (linear chain), while in the case of branched-chain head group-functionalized polymers, the thermochromic transition is observed (beyond 25 °C). Additionally, it has been revealed that these PDA-based irreversible low-temperature thermochromic composite films can be used as a warning indicator for packaged food/drug items kept in a frozen environment.

中文翻译：

聚二乙炔/聚（乙烯醇）复合薄膜作为药物储存应用的低温不可逆指示剂

在这项工作中，聚二乙炔（PDA）与聚乙烯醇（PVA）的复合薄膜被报道为冷冻食品和药品的不可逆低温指示剂。热致变色染料，即功能化丁二炔 (DA)，是通过 10,12-二十五碳二炔酸与不同脂肪醇（直链和支链）的 Steglich 酯化合成的。由于侧头基团缺乏分子间相互作用，合成的 PDA 在低温（7°C 以上）下表现出不可逆的热致变色行为。此外，复合膜是通过将功能化单体掺入聚合物基质中来制造的。单体 DA 在紫外线照射下发生聚合，在复合膜内形成 PDA。不同的分析技术已被用来确认官能化 DA 酯部分的形成。在热致变色研究中，低温颜色转变（7°C以上）是通过用不同的脂肪醇（直链）对头基进行官能化来实现的，而在支链头基官能化聚合物的情况下，观察到热致变色转变（超过25°C）。此外，据透露，这些基于 PDA 的不可逆低温热致变色复合薄膜可用作冷冻环境中包装食品/药品的警告指示剂。

更新日期：2024-03-29

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