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Polymer Classification: Crystallinity

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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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Patterning via Optical Saturable Transitions - Fabrication and Characterization

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Published on: December 11, 2014

Polymeric multimaterials by photochemical patterning of crystallinity.

Adrian K Rylski¹, Henry L Cater¹, Keldy S Mason¹

¹Department of Chemistry, The University of Texas at Austin, Austin, TX 78712, USA.

Science (New York, N.Y.)

|October 13, 2022

Summary

Researchers developed a new method for creating advanced polymer materials by patterning stiff and elastic domains. This technique uses controlled polymerization to create materials with tunable mechanical properties for applications in soft robotics and optoelectronics.

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Area of Science:

Polymer Chemistry
Materials Science

Background:

Designing materials with both stiff and elastic properties is challenging.
Sophisticated architectures for tailored mechanical properties are difficult to synthesize.

Purpose of the Study:

To develop a facile and environmentally benign method for creating patterned polymer materials.
To enable the synergistic combination of stiff and elastic domains within a single material.

Main Methods:

Utilized stereo-controlled ring-opening metathesis polymerization of cis-cyclooctene.
Employed dual polymerization catalysis to control polyolefin backbone chemistry.
Used visible light to selectively activate metathesis catalyst for patterning.

Main Results:

Successfully patterned strong, stiff semicrystalline phases within soft, elastic matrices.
Achieved compositionally uniform materials with seamless stiff-elastic interfaces.
Demonstrated selective formation of trans polyoctenamer rubber via light activation.

Conclusions:

This bottom-up approach offers a novel method for manufacturing advanced polymeric materials.
The developed technique provides precise control over material architecture and properties.
Potential applications include soft optoelectronics and robotics requiring tunable mechanical behavior.