Fabrication of Melamine/Tb\begin{document}$ ^{\textbf{3+}} $\end{document}
doi: 10.1063/1674-0068/cjcp1907143
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摘要: 聚二炔(PDA)是一类具有层状结构的共轭聚合物.在插层过程中，客体组分可插入PDA的层间，形成插层结构.在这些结构中，一部分插层复合物具有近乎完美的组装结构，并展现出完全可逆的热致变色特性.迄今为止，已报到的具有近乎完美组装结构的PDA复合物中仅成功插入了单个客体组分.本文选择其一侧的羧基可与Tb
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关键词:
- 聚二炔 /
- 插层 /
- 三聚氰胺 /
- Tb$ ^{3+} $离子 /
- 可逆热致变色
Abstract: Polydiacetylene (PDA) is one kind of the conjugated polymer with layered structure, which can serve as a host to accommodate the guest components through intercalation. In these intercalated PDAs, some of them were reported to have a nearly perfect organized structure and perform completely reversible thermochromism. Till now, these reported intercalated PDAs were made by only introducing a single component for intercalation. Here, we chose 10, 12-pentacosadiynoic acid (PCDA) as the monomer, of which the carboxyl-terminal groups can interact with either Tb\begin{document}$ ^{3+} $\end{document} \begin{document}$ ^{3+} $\end{document} -
Key words:
- Polydiacetylene /
- Intercalation /
- Melamine /
- Tb$ ^{3+} $ ion /
- Reversible thermochromism
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Scheme 1. Illustration of the preparation procedure of Tb$ ^{3+} $-intercalated PCDA and MA/Tb$ ^{3+} $-intercalated PCDA nano- sheet. The PCDA-MA-Tb$ ^{3+} $ coassemblies were firstly prepared. After annealed at 68 $ ^{\circ} $C for 6 h, the coassemblies were re- organized to Tb$ ^{3+} $-intercalated or MA/Tb$ ^{3+} $-intercalated PCDA depending on the amount of PCDA, MA, and Tb$ ^{3+} $ ion added. In the MA/Tb$ ^{3+} $-intercalated PCDA, there existed Tb$ ^{3+} $-intercalated and MA-intercalated domains.
Figure 1. (a) DSC curve of pure PCDA and Tb$ ^{3+} $-intercalated PCDA, (b) TEM image of Tb$ ^{3+} $-intercalated PCDA nanosheets, and (c) distribution of hydrodynamic diameter ($ D_ \rm{h} $) of Tb$ ^{3+} $-intercalated PCDA nanosheets. The feeding molar ratio of PCDA, MA, and Tb$ ^{3+} $ ion is 3:267:1.
Figure 2. (a) XRD patterns of MA-intercalated PCDA, Tb$ ^{3+} $-intercalated PCDA and MA/Tb$ ^{3+} $-intercalated PCDA, (b) TEM image of MA/Tb$ ^{3+} $-intercalated PCDA nanosheets, (c) distribution of hydrodynamic diameter ($ D_ \rm{h} $) of MA/Tb$ ^{3+} $-intercalated PCDA nanosheet, and (d) DSC curve of PCDA, Tb$ ^{3+} $-intercalated PCDA and MA/Tb$ ^{3+} $-intercalated PCDA. The feeding molar ratio of PCDA, MA, and Tb$ ^{3+} $ ion is 3:267:0.6.
Figure 3. (a) UV-Vis spectra of Tb$ ^{3+} $-intercalated poly-PCDA nanosheet suspension at different temperatures. The abrupt shift of $ \lambda_{ \rm{max}} $ to ca. 550 nm occurred at 80 $ ^{\circ} $C. The dashed line represents the spectrum of the suspension after cooling to 25 $ ^{\circ} $C from 90 $ ^{\circ} $C, indicating the complete reversibility of nanosheet suspension. (b) Colorimetric response (CR) of Tb$ ^{3+} $-intercalated poly-PCDA nanosheet suspension demonstrated its completely reversible thermochromism. The red nanosheet suspension at 90 $ ^{\circ} $C could fully return to the initial blue color when it was cooled to 25 $ ^{\circ} $C during the 20th heating-cooling cycles. (c) UV-Vis spectra of MA/Tb$ ^{3+} $-intercalated poly-PCDA nanosheet suspension during the 1st heating-cooling cycle between 25 $ ^{\circ} $C and 90 $ ^{\circ} $C. (d) CR of nanosheet suspension demonstrated its partial thermochromic reversibility. The red nanosheet suspension at 90 $ ^{\circ} $C yielded to purple color when it was cooled to 25 $ ^{\circ} $C at the 1st heating-cooling cycle. During the 2nd$ - $10th heating-cooling cycles, the suspension alternately switched between purple and red color.
S1. Elemental analysis and ICP-AES results of Tb3+-intercalated PCDA and MA/Tb3+-intercalated PCDA nanosheet
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