NMR Methods for Characterization of Synthetic and Natural Polymers
Chapter 16: Molecular Chain Packing and Conformation in π-Conjugated Polymers from Solid-state NMR
Published:29 Jul 2019
P. Selter and M. R. Hansen, in NMR Methods for Characterization of Synthetic and Natural Polymers, ed. R. Zhang, T. Miyoshi, and P. Sun, The Royal Society of Chemistry, 2019, ch. 16, pp. 363-386.
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Polymers with extended π-conjugation are currently of broad scientific interest due to their promising applications as the active semiconducting material in flexible organic electronic devices. The main advantage of using π-conjugated polymers is that this enables the fabrication via solution processing. However, this yields materials that are semicrystalline, potentially lacking any long-range order, and prevents direct access to details about the molecular organization from a conventional approach. In this chapter, we first provide the reader with a brief introduction to the area of semiconducting π-conjugated polymers and the challenges associated with characterizing their structure at the molecular level. This is followed by a selected overview of 1D and 2D solid-state NMR techniques that are capable of elucidating the molecular chain packing and conformation for semicrystalline π-conjugated polymers. Finally, three examples are given highlighting how the selected NMR techniques can be used to gain molecular insights into this kind of material.