Pyranine Based Ion‐Paired Complex as a Mechanophore in Polyurethanes
| Autor: | Annelore Aerts, Johan P. A. Heuts, Rint P. Sijbesma, Sean J.D. Lugger |
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| Přispěvatelé: | Macromolecular and Organic Chemistry, Supramolecular Polymer Chemistry, Stimuli-responsive Funct. Materials & Dev., ICMS Core |
| Rok vydání: | 2020 |
| Předmět: |
Polymers and Plastics
Polymers polyurethanes 02 engineering and technology 010402 general chemistry Photochemistry ion-paired complexes 01 natural sciences Dissociation (chemistry) mechanophores Pyranine chemistry.chemical_compound Materials Chemistry Arylsulfonates Thermoplastic elastomer Tetrahydrofuran Polyurethane chemistry.chemical_classification Organic Chemistry fluorescence probes Polymer 021001 nanoscience & nanotechnology Fluorescence 0104 chemical sciences Elastomers chemistry Dimethylformamide 0210 nano-technology |
| Zdroj: | Macromolecular Rapid Communications, 42(1):2000476. Wiley-VCH Verlag |
| ISSN: | 1521-3927 1022-1336 |
| DOI: | 10.1002/marc.202000476 |
| Popis: | A new mechanophore for polyurethane thermoplastic elastomers based on ion-paired complexes is developed. 8-(2-hydroxyethoxy)pyrene-1,3,6-trisulfonate (HEPTS) is incorporated into polyurethanes as an end-capper and aggregates in apolar media. Aggregation of the ionic HEPTS end groups in solution depends on concentration solvent polarity. The addition of dimethylformamide to a tetrahydrofuran solution of the polymer results in the dissociation of the aggregates and a significant shift in fluorescence emission from yellow to blue. The same shift in fluorescence emission is induced by stretching the solid polymer at strains larger than 1 and stresses above 7.5 MPa, with a clear increase above 12.5 MPa. Strain induced dissociation of HEPTS aggregates not attached to the polymer chain leads to fluorescence changes that are much less reproducible. |
| Databáze: | OpenAIRE |
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