Synthesis of helical phenolic resin bundles through a sol-gel transcription method

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Abstract

Chiral and helical polymers possess special helical structures and optical property, and may find applications in chiral catalysis and optical devices. This work presents the preparation and formation process of helical phenolic resins through a sol-gel transcription method. A pair of bola-type chiral low-molecular-weight gelators (LMWGs) derived from valine are used as templates, while 2,4-dihydroxybenzoic acid and formaldehyde are used as precursors. The electron microscopy images show that the phenolic resins are single-handed helical bundles comprised of helical ultrafine nanofibers. The diffused reflection circular dichroism spectra indicate that the helical phenolic resins exhibit optical activity. A possible formation mechanism is proposed, which shows the co-assembly of the LMWGs and the precursors.

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Shao, C., Li, J., Chen, H., Li, B., Li, Y., & Yang, Y. (2017). Synthesis of helical phenolic resin bundles through a sol-gel transcription method. Gels, 3(1). https://doi.org/10.3390/gels3010009

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