A Simply Synthesized, Tough Polyarylene with Transient Mechanochromic Response
| Autor: | Sophie Hameury, Felix Riehle, Michael Sommer, Hannah Buchheit, Michael Walter, Fabian Kempe, Sarah Noemi Momm, Oliver Brügner |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2017 |
| Předmět: |
Spiropyran
Molar mass Materials science Comonomer 02 engineering and technology General Chemistry General Medicine 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Covalent bond Polymer chemistry Copolymer Nitro Merocyanine 0210 nano-technology |
| Zdroj: | Angewandte Chemie. 130:1009-1012 |
| ISSN: | 0044-8249 |
| Popis: | A simple and high‐yielding route to tough polyarylenes of the type poly(meta,meta,para‐phenylene) (PmmpP) is developed. PmmpP is tough even in its as‐synthesized state which has an intermediate molar mass of Mw≈60 kg mol−1 and exhibits outstanding mechanical properties at further optimized molecular weight of Mw=96 kg mol−1, E=0.9 GPa, e=300 %. Statistical copolymers with para,para‐spiropyran (SP) are mechanochromic, and the toughness allows mechanochromism to be investigated. Strained samples instantaneously lose color upon force release. DFT calculations show this phenomenon to be caused by the PmmpP matrix that allows build‐up of sufficiently large forces to be transduced to SP, and the relatively unstable corresponding merocyanine (MC) form arising from the aromatic co‐monomer. MC units covalently incorporated into PmmpP show a drastically reduced half life time of 3.1 s compared to 4.5 h obtained for SP derivatives with common 6‐nitro substitution. |
| Databáze: | OpenAIRE |
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