| 학회 |
한국고분자학회 |
| 학술대회 |
2019년 가을 (10/09 ~ 10/11, 제주컨벤션센터) |
| 권호 |
44권 2호 |
| 발표분야 |
Korea-Taiwan Joint Symposium: Emerging Technology in Polymer Science (English) |
| 제목 |
Generating Reactive Functional Groups from Mechanochemically Responsive Polymers |
| 초록 |
Covalent polymer mechanochemistry offers many opportunities for constructing advanced material systems that are capable of stress-sensing, stress-strengthening and self-healing. Externaly applied mechanical force can be exploited to promote selective chemical transformation in the overstressed region, resulting in the formation of new functional groups at the polymer chain scission point. Molecular engineering of mechanochemically responsive motifs provides a means for applying organic chemistry in the context of force-responsive materials. We demonstrate that mechanochemical generation of isocyanates is feasible through retro [2 + 2] cycloaddition of a 1,2-diazetidinone (DAO) mechanophore. A single DAO mechanophore is incorporated into the chain center of a poly(methyl acrylate) (PMA) backbone via single electron transfer-living radical polymerization. Facile activation of DAO via ultrasonic sonication leads to the formation of isocyanate and imine products, as supported by trapping experiments using 9-(methylaminomethyl)anthracene labelling, UV spectroscopy and 1H NMR spectroscopy. The concept present herein provides a new strategy to unveil blocked isocyanates on-demand. |
| 저자 |
Chia-Chih Chang |
| 소속 |
Department of Applied Chemistry |
| 키워드 |
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| E-Mail |
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