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Stiffness Variable Polymers Comprising Phase-Changing Side-Chains: Material Syntheses and Application Explorations
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DOI：10.1002/adma.202109798.png)
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Abstract
En 中文
Stiffness variable materials have been applied in a variety of engineering fields that require adaptation, automatic modulation, and morphing because of their unique property to switch between a rigid, load-bearing state and a soft, compliant state. Stiffness variable polymers comprising phase-changing side-chains (s-SVPs) have densely grafted, highly crystallizable long alkyl side-chains in a crosslinked network. Such a bottlebrush network-like structure gives rise to rigidity modulation as a result of the reversible crystallization and melting of the side chains. The corresponding modulus changes can be more than 1000-fold within a narrow temperature span, from approximate to 10(2) MPa to approximate to 10(2) kPa or lower. Other important properties of the s-SVP, such as stretchability, optical transmittance, and adhesion, can also be altered. This work reviews the underlying molecular mechanisms in the s-SVP's, discusses the material's structure-property relationship, and summarizes important applications explored so far, including reversible shape transformation, bistable electromechanical transduction, optical modulation, and reversible adhesion.
Keywords:
alkyl chains
bottlebrush
dielectric actuators
phase transition
shape memory
side-chain crystalline
stiffness variable polymers
Journal
IF:
26.8
Papers:
3.4W
Citations:
46.0W
