Shifting Electronic Structure by Inherent Tension in Molecular Bottlebrushes with Polythiophene Backbones
| Autor: | Alper Nese, Weitao Yang, Sergei S. Sheiko, Travis W. LaJoie, Wei You, Natalia V. Lebedeva, Yuanchao Li, Joanna Burdynska, Mihaela C. Stefan, Krzysztof Matyjaszewski, Xiangqian Hu |
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| Rok vydání: | 2022 |
| Předmět: |
Materials science
Polymers and Plastics Atom-transfer radical-polymerization Organic Chemistry Substrate (chemistry) Adhesion Inorganic Chemistry chemistry.chemical_compound chemistry Chemical engineering Ultimate tensile strength Polymer chemistry Materials Chemistry Side chain Molecule Polythiophene Macromolecule |
| Zdroj: | ACS macro letters. 3(8) |
| ISSN: | 2161-1653 |
| Popis: | Bottlebrush macromolecules can be regarded as molecular tensile machines, where tension is self-generated along the backbone due to steric repulsion between densely grafted side chains. This intrinsic tension is amplified upon adsorption of bottlebrush molecules onto a substrate and increases with grafting density, side chain length, and strength of adhesion to the substrate. To investigate the effects of tension on the electronic structure of polythiophene (PT), bottlebrush macromolecules were prepared by grafting poly(n-butyl acrylate) (PBA) side chains from PT macroinitiators by atom transfer radical polymerization (ATRP). The fluorescence spectra of submonolayers of PT bottlebrushes were measured on a Langmuir–Blodgett (LB) trough with the backbone tension adjusted by controlling the side-chain length, surface pressure, and chemical composition of a substrate. The wavelength of maximum emission has initially red-shifted, followed by a blue-shift as the backbone tension increases from 0 to 2.5 nN, whic... |
| Databáze: | OpenAIRE |
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