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Reconfigurable, Solvent-Processable, NIR-Triggerable Shape Memory Cyanate Esters for Smart Molds.

Zhangzhang Tang^1,2, Gao Deng³, Pengrui Cao^1,2

¹Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P.R. China.

ACS Applied Materials & Interfaces

|May 11, 2023

Summary

This summary is machine-generated.

This study introduces a novel cyanate ester smart composite (CESC) for advanced shape memory polymer (SMP) molds. This material offers enhanced stretchability and reconfigurable shape memory effects, enabling easier demolding of complex structures.

Keywords:

NIR-triggerable dynamic covalent bond shape memory cyanate ester smart mold solvent-processable

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Shape memory polymer (SMP)-based smart molds offer high-resolution shaping and external stimuli-responsive morphing for complex structure demolding.
Existing SMPs often lack sufficient stretchability, leading to damage during the demolding process.

Purpose of the Study:

To develop a novel cyanate ester smart composite (CESC) with enhanced shape memory properties for smart mold applications.
To investigate the reconfigurable, solvent-processable, and near-infrared (NIR)-triggerable shape memory effect (SME) of the developed material.

Main Methods:

Synthesized a cyanate ester smart composite (CESC) incorporating dynamic covalent bonds for reconfigurability.
Investigated the shape memory effect (SME) triggered by near-infrared (NIR) radiation and solvent processing.
Analyzed the underlying mechanisms, including transesterification, cyanurate exchange, cross-linking density, and polymer chain mobility.

Main Results:

The CESC exhibits a reconfigurable, solvent-processable, and NIR-triggerable SME, enabling 2D sheets to form complex 3D shapes.
Demonstrated the reconfigurable SME and recyclability of the shape memory cyanate ester (SMCE) for the first time.
The solvent-processable SME mechanism was linked to variations in cross-linking density and polymer chain mobility.

Conclusions:

The developed CESC offers versatile applications as a smart mold due to its integrated multiple and reconfigurable SMEs.
Presents a new design strategy for thermoset cyanate materials, addressing limitations in stretchability and recyclability for SMP smart molds.