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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

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Published on: January 19, 2016

Highly stretchable ionically crosslinked acrylate elastomers inspired by polyelectrolyte complexes.

Hongyi Cai¹, Zhongtong Wang², Nyalaliska W Utomo³

¹Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA.

|September 29, 2022

Summary

This summary is machine-generated.

Ionic crosslinks in elastomers enhance stiffness and recovery. Modifying monomer composition, like using 2-hydroxyethyl acrylate, improves self-healing and recovery but reduces strength.

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Area of Science:

Materials Science
Polymer Chemistry
Soft Matter Physics

Background:

Dynamic bonds offer tunable mechanical properties in elastomers, including self-healing and recyclability.
Electrostatic interactions via ionic crosslinks create tough and resilient elastomers and hydrogels.

Purpose of the Study:

Investigate the mechanical properties of ionically crosslinked ethyl acrylate-based elastomers.
Understand the role of ionic interactions in elastomer stiffness, recovery, and self-healing.

Main Methods:

Assembled oppositely charged copolymers to form ionically crosslinked elastomers.
Utilized infrared and Raman spectroscopy to confirm ionic interactions.
Performed mechanical testing at various strain rates and levels to assess properties.

Main Results:

Ionic interactions were confirmed, leading to increased stiffness and enhanced recovery compared to individual copolymers.
Strain rate influences recovery: fast rates preserve ionic bonds, while slow rates disrupt them.
Higher ionic content increases stiffness; 2-hydroxyethyl acrylate improves recovery and self-healing at the expense of stiffness.

Conclusions:

Ionic crosslinking is an effective strategy to enhance elastomer mechanical properties.
Design principles for polyelectrolyte complex-inspired elastomers can be applied to tailor material performance for specific applications.
The choice of monomer (e.g., ethyl acrylate vs. 2-hydroxyethyl acrylate) significantly impacts a balance of properties.