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Polymer Classification: Crystallinity

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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Updated: Jan 9, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Fluorescent coordination-polymer single crystals with tunable elastic-plastic transformations.

Jia-Hui Zhang¹, Yu-Xia Li¹, Kai-Ge Gao²

¹Key Laboratory of Cluster Science of the Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 102488, China. zishuoyao@bit.edu.cn.

Dalton Transactions (Cambridge, England : 2003)

|December 2, 2025

Summary

This summary is machine-generated.

Researchers developed new 1D cadmium coordination polymers that bend controllably. Ligand modification tunes mechanical response from elastic to plastic, enabling flexible optoelectronics.

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Last Updated: Jan 9, 2026

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Published on: February 6, 2016

Area of Science:

Materials Science
Inorganic Chemistry
Crystallography

Background:

Controlling mechanical responses in complex single crystals is difficult.
Coordination polymers offer tunable properties but achieving mechanical control is challenging.

Purpose of the Study:

To design and synthesize cadmium(II) coordination polymers with controllable mechanical responses.
To investigate the relationship between crystal structure and mechanical behavior.
To explore the luminescent properties of these materials.

Main Methods:

Synthesis of a homologous series of 1D cadmium(II) coordination polymers.
Systematic modification of imidazole-based ligands.
Mechanical testing under external load.
Photoluminescence spectroscopy.

Main Results:

Achieved controllable bending in cadmium coordination polymers.
Tuned mechanical response (elastic to plastic) by altering metal-metal separation via ligand design.
Identified an inverse correlation between metal-metal repeat distance and elastic strain.
Observed stable blue photoluminescence.

Conclusions:

Cadmium coordination polymers with tunable mechanical properties were successfully synthesized.
Ligand modification is key to controlling mechanical response and achieving desired properties.
These materials show potential for flexible optoelectronic applications and optical waveguides.