MersV1, Main, Exploration, bibRecord, 000222

Direct Observation of Chain Lengths and Conformations in Oligofluorene Distributions from Controlled Polymerization by Double Electron-Electron Resonance.

Identifieur interne : 000222 ( Main/Exploration ); précédent : 000221; suivant : 000223

Direct Observation of Chain Lengths and Conformations in Oligofluorene Distributions from Controlled Polymerization by Double Electron-Electron Resonance.

Auteurs : Dennis Bücker [Allemagne] ; Annika Sickinger [Allemagne] ; Julian D. Ruiz Perez [Allemagne] ; Manuel Oestringer [Allemagne] ; Stefan Mecking [Allemagne] ; Malte Drescher [Allemagne]

Source :

Journal of the American Chemical Society [ 1520-5126 ] ; 2020.

RBID : pubmed:31891263

Abstract

Synthetic polymers are mixtures of chains with different lengths, and their chain length and chain conformation are often experimentally characterized by ensemble averages. We demonstrate that double electron-electron resonance (DEER) spectroscopy can reveal the chain length distribution and the chain conformation and flexibility of the individual n-mers in oligo-(9,9-dioctylfluorene) from controlled Suzuki-Miyaura coupling polymerization. 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.

DOI: 10.1021/jacs.9b11404
PubMed: 31891263

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">Synthetic polymers are mixtures of chains with different lengths, and their chain length and chain conformation are often experimentally characterized by ensemble averages. We demonstrate that double electron-electron resonance (DEER) spectroscopy can reveal the chain length distribution and the chain conformation and flexibility of the individual <i>n</i>
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Direct Observation of Chain Lengths and Conformations in Oligofluorene Distributions from Controlled Polymerization by Double Electron-Electron Resonance.

Direct Observation of Chain Lengths and Conformations in Oligofluorene Distributions from Controlled Polymerization by Double Electron-Electron Resonance.

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Abstract

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