A Supramolecular Hydrogel Based on Copolymers of Acrylic Acid and Maleic Anhydride Derivatives with Terpyridine Motifs
A kind of terpyridine derivative (<b>NH<sub>2</sub>-Tpy</b>) in which the amino was incorporated by a short alkyl chain was synthesized. Through grafting of terpyridine units into the hydrophilic copolymers of maleic anhydride and acrylic acid <b>PAAMa</b> via the...
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MDPI AG
2022-07-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/14/2857 |
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| author | Zheng Chi Chenchen Ma Ziyuan He Zihan Ma Xuegang Chen Zhaoge Huang |
| author_facet | Zheng Chi Chenchen Ma Ziyuan He Zihan Ma Xuegang Chen Zhaoge Huang |
| author_sort | Zheng Chi |
| collection | DOAJ |
| description | A kind of terpyridine derivative (<b>NH<sub>2</sub>-Tpy</b>) in which the amino was incorporated by a short alkyl chain was synthesized. Through grafting of terpyridine units into the hydrophilic copolymers of maleic anhydride and acrylic acid <b>PAAMa</b> via the reaction of the amino groups in <b>NH<sub>2</sub>-Tpy</b> and the maleic anhydride units, a series of gelator polymers—<b>P1</b>, <b>P2</b>, and <b>P3</b>—containing different contents of terpyridine units was synthesized. Under coordination of Ni<sup>2+</sup> and terpyridine ligands in linear polymers, the supramolecular hydrogels <b>H1</b>, <b>H2</b>, and <b>H3</b> with different cross-linking degrees were prepared. The linear polymers <b>P1</b>–<b>P3</b> had a strong absorption peak at about 290 nm in the UV-vis spectra which was attributed to π–π* transition, and there was a new peak at about 335 nm led by the metal-to-ligands charge transfer (MLCT) when coordinated with Ni<sup>2+</sup> ions. According to the rheological behaviors, the storage modulus (G′) was larger than the loss modulus (G′′). These hydrogels showed typical gel-like characteristics when the terpyridine content of the hydrogels exceeded 10%, and the hydrogels showed liquid-like characteristics when the terpyridine content of the hydrogels was less than 7%. The results of the micromorphological investigation of the xerogels from SEM illustrated the metal–terpyridine coordination cross-linking could have an important influence on the microstructures of the resulting hydrogels. Furthermore, these hydrogels based on supramolecular cross-links exhibited reversible solution–gel transition at different environmental temperatures. At the same time, the equilibrium swelling of the supramolecular hydrogels was 8.0–12.3 g/g, which increased with the decrease in the content of the terpyridine units in the resulting hydrogels. |
| first_indexed | 2024-03-09T13:08:55Z |
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| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T13:08:55Z |
| publishDate | 2022-07-01 |
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| series | Polymers |
| spelling | doaj.art-aa640bbdfbde4a16b25b3fc4d980690a2023-11-30T21:44:53ZengMDPI AGPolymers2073-43602022-07-011414285710.3390/polym14142857A Supramolecular Hydrogel Based on Copolymers of Acrylic Acid and Maleic Anhydride Derivatives with Terpyridine MotifsZheng Chi0Chenchen Ma1Ziyuan He2Zihan Ma3Xuegang Chen4Zhaoge Huang5Key Laboratory of Rubber-Plastic of Ministry of Education (QUST), School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaKey Laboratory of Rubber-Plastic of Ministry of Education (QUST), School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaKey Laboratory of Rubber-Plastic of Ministry of Education (QUST), School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaKey Laboratory of Rubber-Plastic of Ministry of Education (QUST), School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaKey Laboratory of Rubber-Plastic of Ministry of Education (QUST), School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaKey Laboratory of Rubber-Plastic of Ministry of Education (QUST), School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaA kind of terpyridine derivative (<b>NH<sub>2</sub>-Tpy</b>) in which the amino was incorporated by a short alkyl chain was synthesized. Through grafting of terpyridine units into the hydrophilic copolymers of maleic anhydride and acrylic acid <b>PAAMa</b> via the reaction of the amino groups in <b>NH<sub>2</sub>-Tpy</b> and the maleic anhydride units, a series of gelator polymers—<b>P1</b>, <b>P2</b>, and <b>P3</b>—containing different contents of terpyridine units was synthesized. Under coordination of Ni<sup>2+</sup> and terpyridine ligands in linear polymers, the supramolecular hydrogels <b>H1</b>, <b>H2</b>, and <b>H3</b> with different cross-linking degrees were prepared. The linear polymers <b>P1</b>–<b>P3</b> had a strong absorption peak at about 290 nm in the UV-vis spectra which was attributed to π–π* transition, and there was a new peak at about 335 nm led by the metal-to-ligands charge transfer (MLCT) when coordinated with Ni<sup>2+</sup> ions. According to the rheological behaviors, the storage modulus (G′) was larger than the loss modulus (G′′). These hydrogels showed typical gel-like characteristics when the terpyridine content of the hydrogels exceeded 10%, and the hydrogels showed liquid-like characteristics when the terpyridine content of the hydrogels was less than 7%. The results of the micromorphological investigation of the xerogels from SEM illustrated the metal–terpyridine coordination cross-linking could have an important influence on the microstructures of the resulting hydrogels. Furthermore, these hydrogels based on supramolecular cross-links exhibited reversible solution–gel transition at different environmental temperatures. At the same time, the equilibrium swelling of the supramolecular hydrogels was 8.0–12.3 g/g, which increased with the decrease in the content of the terpyridine units in the resulting hydrogels.https://www.mdpi.com/2073-4360/14/14/2857supramolecular hydrogelacrylic acidmaleic anhydrideterpyridinecoordination interaction |
| spellingShingle | Zheng Chi Chenchen Ma Ziyuan He Zihan Ma Xuegang Chen Zhaoge Huang A Supramolecular Hydrogel Based on Copolymers of Acrylic Acid and Maleic Anhydride Derivatives with Terpyridine Motifs Polymers supramolecular hydrogel acrylic acid maleic anhydride terpyridine coordination interaction |
| title | A Supramolecular Hydrogel Based on Copolymers of Acrylic Acid and Maleic Anhydride Derivatives with Terpyridine Motifs |
| title_full | A Supramolecular Hydrogel Based on Copolymers of Acrylic Acid and Maleic Anhydride Derivatives with Terpyridine Motifs |
| title_fullStr | A Supramolecular Hydrogel Based on Copolymers of Acrylic Acid and Maleic Anhydride Derivatives with Terpyridine Motifs |
| title_full_unstemmed | A Supramolecular Hydrogel Based on Copolymers of Acrylic Acid and Maleic Anhydride Derivatives with Terpyridine Motifs |
| title_short | A Supramolecular Hydrogel Based on Copolymers of Acrylic Acid and Maleic Anhydride Derivatives with Terpyridine Motifs |
| title_sort | supramolecular hydrogel based on copolymers of acrylic acid and maleic anhydride derivatives with terpyridine motifs |
| topic | supramolecular hydrogel acrylic acid maleic anhydride terpyridine coordination interaction |
| url | https://www.mdpi.com/2073-4360/14/14/2857 |
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