Direct Observation of Chain Lengths and Conformations in Oligofluorene Distributions from Controlled Polymerization by Double Electron-Electron Resonance
| Autor: | Stefan Mecking, Manuel Oestringer, Annika Sickinger, Malte Drescher, Julian D. Ruiz Perez, Dennis Bücker |
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| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Resonance Nanoparticle General Chemistry Polymer Fluorene Biochemistry Catalysis law.invention chemistry.chemical_compound Crystallography Colloid and Surface Chemistry chemistry Chain (algebraic topology) Polymerization law Spectroscopy Electron paramagnetic resonance |
| DOI: | 10.26434/chemrxiv.10002785 |
| Popis: | Synthetic polymers are mixtures of different length chains, and their chain length and chain conformation is often experimentally characterized by ensemble averages. We demonstrate that Double-Electron-Electron-Resonance (DEER) spectroscopy can reveal the chain length distribution, and chain conformation and flexibility of the individual n-mers in oligo-(9,9-dioctylfluorene) from controlled Suzuki-Miyaura Coupling Polymerization (cSMCP). The required spin-labeled chain ends were introduced efficiently via a TEMPO-substituted initiator and chain terminating agent, respectively, with an in situ catalyst system. Individual precise chain length oligomers as reference materials were obtained by a stepwise approach. Chain length distribution, chain conformation and flexibility can also be accessed within poly(fluorene) nanoparticles. |
| Databáze: | OpenAIRE |
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