Reprocessable, Reworkable, and Mechanochromic Polyhexahydrotriazine Thermoset with Multiple Stimulus Responsiveness
Developing recyclable, reworkable, and intelligent thermosetting polymers, as a long-standing challenge, is highly desirable for modern manufacturing industries. Herein, we report a polyhexahydrotriazine thermoset (PHT) prepared by a one-pot polycondensation between 4-aminophenyl disulfide and paraf...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/12/10/2375 |
| _version_ | 1797550791669579776 |
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| author | Li Chen Siyao Zhu Innocent Toendepi Qiuran Jiang Yi Wei Yiping Qiu Wanshuang Liu |
| author_facet | Li Chen Siyao Zhu Innocent Toendepi Qiuran Jiang Yi Wei Yiping Qiu Wanshuang Liu |
| author_sort | Li Chen |
| collection | DOAJ |
| description | Developing recyclable, reworkable, and intelligent thermosetting polymers, as a long-standing challenge, is highly desirable for modern manufacturing industries. Herein, we report a polyhexahydrotriazine thermoset (PHT) prepared by a one-pot polycondensation between 4-aminophenyl disulfide and paraformaldehyde. The PHT has a glass transition temperature of 135 °C and good solvent resistance. The incorporation of dual stimuli-responsive groups (disulfide bond and hexahydrotriazine ring) endows the PHT with re-processability, re-workability, and damage monitoring function. The PHT can be repeatedly reprocessed by hot pressing, and a near 100% recovery of flexural strength is achieved. The PHT can also degrade in inorganic acid or organic thiol solutions at room temperature. The thermally reworkable test demonstrates that, after heating the PHT at 200 °C for 1 h, the residuals can be easily wiped off. Finally, the PHT exhibits a reversible mechanochromic behavior when damaged. |
| first_indexed | 2024-03-10T15:35:29Z |
| format | Article |
| id | doaj.art-5dd15f7b14044df8bf0526dec556e659 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T15:35:29Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-5dd15f7b14044df8bf0526dec556e6592023-11-20T17:17:54ZengMDPI AGPolymers2073-43602020-10-011210237510.3390/polym12102375Reprocessable, Reworkable, and Mechanochromic Polyhexahydrotriazine Thermoset with Multiple Stimulus ResponsivenessLi Chen0Siyao Zhu1Innocent Toendepi2Qiuran Jiang3Yi Wei4Yiping Qiu5Wanshuang Liu6Shanghai Collaborative Innovation Center for High Performance Fiber Composites, Center for Civil Aviation Composites, Donghua University, 2999 North Renmin Road, Shanghai 201620, ChinaShanghai Collaborative Innovation Center for High Performance Fiber Composites, Center for Civil Aviation Composites, Donghua University, 2999 North Renmin Road, Shanghai 201620, ChinaShanghai Collaborative Innovation Center for High Performance Fiber Composites, Center for Civil Aviation Composites, Donghua University, 2999 North Renmin Road, Shanghai 201620, ChinaKey Laboratory of Textile Science &Technology, Ministry of Education, College of Textiles, Donghua University, 2999 North Renmin Road, Shanghai 201620, ChinaShanghai Collaborative Innovation Center for High Performance Fiber Composites, Center for Civil Aviation Composites, Donghua University, 2999 North Renmin Road, Shanghai 201620, ChinaKey Laboratory of Textile Science &Technology, Ministry of Education, College of Textiles, Donghua University, 2999 North Renmin Road, Shanghai 201620, ChinaShanghai Collaborative Innovation Center for High Performance Fiber Composites, Center for Civil Aviation Composites, Donghua University, 2999 North Renmin Road, Shanghai 201620, ChinaDeveloping recyclable, reworkable, and intelligent thermosetting polymers, as a long-standing challenge, is highly desirable for modern manufacturing industries. Herein, we report a polyhexahydrotriazine thermoset (PHT) prepared by a one-pot polycondensation between 4-aminophenyl disulfide and paraformaldehyde. The PHT has a glass transition temperature of 135 °C and good solvent resistance. The incorporation of dual stimuli-responsive groups (disulfide bond and hexahydrotriazine ring) endows the PHT with re-processability, re-workability, and damage monitoring function. The PHT can be repeatedly reprocessed by hot pressing, and a near 100% recovery of flexural strength is achieved. The PHT can also degrade in inorganic acid or organic thiol solutions at room temperature. The thermally reworkable test demonstrates that, after heating the PHT at 200 °C for 1 h, the residuals can be easily wiped off. Finally, the PHT exhibits a reversible mechanochromic behavior when damaged.https://www.mdpi.com/2073-4360/12/10/2375polyhexahydrotriazinevitrimersrecyclabilitydisulfide bonds |
| spellingShingle | Li Chen Siyao Zhu Innocent Toendepi Qiuran Jiang Yi Wei Yiping Qiu Wanshuang Liu Reprocessable, Reworkable, and Mechanochromic Polyhexahydrotriazine Thermoset with Multiple Stimulus Responsiveness Polymers polyhexahydrotriazine vitrimers recyclability disulfide bonds |
| title | Reprocessable, Reworkable, and Mechanochromic Polyhexahydrotriazine Thermoset with Multiple Stimulus Responsiveness |
| title_full | Reprocessable, Reworkable, and Mechanochromic Polyhexahydrotriazine Thermoset with Multiple Stimulus Responsiveness |
| title_fullStr | Reprocessable, Reworkable, and Mechanochromic Polyhexahydrotriazine Thermoset with Multiple Stimulus Responsiveness |
| title_full_unstemmed | Reprocessable, Reworkable, and Mechanochromic Polyhexahydrotriazine Thermoset with Multiple Stimulus Responsiveness |
| title_short | Reprocessable, Reworkable, and Mechanochromic Polyhexahydrotriazine Thermoset with Multiple Stimulus Responsiveness |
| title_sort | reprocessable reworkable and mechanochromic polyhexahydrotriazine thermoset with multiple stimulus responsiveness |
| topic | polyhexahydrotriazine vitrimers recyclability disulfide bonds |
| url | https://www.mdpi.com/2073-4360/12/10/2375 |
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