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Updated: May 13, 2025
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
Published on: September 26, 2016
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High-fidelity topochemical polymerization in single crystals, polycrystals, and solution aggregates
Chongqing Yang1, Jianfang Liu1, Rebecca Shu Hui Khoo1
1The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
Nature Communications
|April 12, 2025
Summary
Topochemical polymerization (TCP) now achieves single-crystal-to-single-crystal transformations in liquid media. This breakthrough enables the synthesis of highly crystalline polymer nanofibers with precise structural integrity.
Area of Science:
- Polymer Chemistry
- Materials Science
- Crystallography
Background:
- Topochemical polymerization (TCP) is key for single crystalline polymer synthesis.
- Traditional TCP is limited to solid-state transformations, facing challenges in single-crystal-to-single-crystal (SCSC) transitions due to lattice mismatches.
- Performing TCP in liquid media while maintaining solid-state fidelity remains an open challenge.
Purpose of the Study:
- To investigate the SCSC transformation mechanism of chiral azaquinodimethane (AQM) monomers during TCP.
- To explore the potential of performing TCP in a liquid medium.
- To understand the influence of side-chain structure on polymerization kinetics.
Main Methods:
- In situ X-ray crystallographic analysis to monitor SCSC transformations.
- In situ investigations of powders and thin films.
- Antisolvent-reinforced aggregation method for liquid-phase TCP.
Main Results:
- Detailed elucidation of SCSC transformation during chiral AQM monomer TCP, revealing a rare metastable crystalline phase.
- Identification of side-chain dependent polymerization kinetics in solid-state reactions.
- Successful implementation of liquid-medium TCP for AQM monomers, producing highly crystalline polymer nanofibers comparable to solid-state products.
Conclusions:
- TCP demonstrates high structural precision in both solid and liquid states.
- The study provides critical insights for synthesizing processable nanostructured polymers with controlled structural integrity.
- This work expands the scope of TCP for creating advanced polymer materials.
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