Abstract Although the reversibility of 10, 12-pentacosadiynoic amino meta-acid (PCDA-mBzA) against temperature and pH was reported, the modulation of reversibility by ion adsorption at terminal functional group has not been investigated. In this work, we developed a simple method for modulating the reversibility of PCDA-mBzA films upon a thermal stimulus by cadmium ion adsorption inducing the breakage of the outer hydrogen bonding of two hydrogen bonds, which are responsible for the reversible properties of PCDA-mBzA. External reflection-Fourier transform infrared (ER-FTIR) analyses revealed that the hydrogen bonding between the carboxylic acid groups was broken through ion adsorption and only a single hydrogen bond between the amide groups remained in the PCDA-mBzA polymer. In addition, PCDA-mBzA films could recover their original property through cadmium ion desorption. These results present that the transition between reversibility and irreversibility can be modulated artificially simply through the adsorption and desorption of metal ions.

中文翻译：

---

通过镉离子吸附/解吸调节聚二乙炔 Langmuir Schafer (LS) 薄膜的颜色可逆性

摘要 尽管报道了 10, 12-二十五碳二炔氨基酸 (PCDA-mBzA) 对温度和 pH 的可逆性，但尚未研究通过末端官能团的离子吸附调节可逆性。在这项工作中，我们开发了一种简单的方法，通过镉离子吸附诱导两个氢键的外氢键断裂，从而在热刺激下调节 PCDA-mBzA 薄膜的可逆性，这导致 PCDA-mBzA 的可逆特性. 外反射傅里叶变换红外 (ER-FTIR) 分析表明，羧酸基团之间的氢键通过离子吸附被破坏，并且在 PCDA-mBzA 聚合物中，酰胺基团之间仅保留一个氢键。此外，PCDA-mBzA 薄膜可以通过镉离子解吸恢复其原始性能。这些结果表明可逆性和不可逆性之间的转变可以简单地通过金属离子的吸附和解吸来人为调节。