Mechanochromic Polymers

Chen, Yulan; Sommer, Michael; Weder, Christoph

doi:10.1002/marc.202000685

Cited by 9 publications

(7 citation statements)

References 24 publications

(27 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The advancing class of mechanochromic polymers 16 , which change their visual appearance in response to mechanical deformation, can be very powerful in this context if the right type is used. Molecular-scale processes may give too low contrast (Raisch et al recently reported a wavelength shift of Δ λ = 12 nm (ref.…”

Section: Mainmentioning

confidence: 99%

Robust cholesteric liquid crystal elastomer fibres for mechanochromic textiles

2022

View full text Add to dashboard Cite

Mechanically responsive textiles have transformative potential in many areas from fashion to healthcare. Cholesteric liquid crystal elastomers have strong mechanochromic responses that offer attractive opportunities for such applications. Nonetheless, making liquid crystalline elastomer fibres suitable for textiles is challenging since the Plateau–Rayleigh instability tends to break up precursor solutions into droplets. Here, we report a simple approach that balances the viscoelastic properties of the precursor solution to avoid this outcome and achieve long and mechanically robust cholesteric liquid crystal elastomer filaments. These filaments have fast, progressive and reversible mechanochromic responses, from red to blue (wavelength shift of 155 nm), when stretched up to 200%. Moreover, the fibres can be sewed into garments and withstand repeated stretching and regular machine washing. This approach and resulting fibres may be useful for applications in wearable technology and other areas benefiting from autonomous strain sensing or detection of critically strong deformations.

show abstract

Section: Mainmentioning

confidence: 99%

Robust cholesteric liquid crystal elastomer fibres for mechanochromic textiles

2022

View full text Add to dashboard Cite

show abstract

“…Mechanical chromogenesis, also termed piezochromism, refers to a reversible color or emission change initiated by mechanical stress. − As previously described, porous structures or uneven and nonuniform surfaces can influence the scattering route of light. Accordingly, when the surface morphology or internal structure is reconfigured due to mechanical driving, the scattering at the material’s surface/internal region changes, resulting in responses in optical transmittance …”

Section: Stimuli-responsive Design For Coolingmentioning

confidence: 99%

Hydrogel-Based Stimuli-Responsive Radiative and/or Evaporative Cooling Materials for Carbon Neutrality

Shang,

Zhang,

Zhang

et al. 2024

ACS Energy Lett.

View full text Add to dashboard Cite

Radiative cooling cools by radiating heat toward outer space. Evaporative cooling cools by dispatching the latent heat of water via evaporation. These two types of cooling operate without additional pollutant generation. Hydrogel is the one substance that can combine the above two cooling strategies and thus holds high promise to facilitate the construction of a carbon neutral society. This review article first documents the basic principles related to passive cooling, evaporative cooling, heat transfer, and light modulation. Then, the general considerations for hydrogel-based cooling materials are summarized. Third, stimuli-responsive hydrogel-based cooling systems are systematically discussed from aspects of operation mechanisms as well as material selections. Lastly, typical applications of hydrogel-based radiative and/or evaporative cooling materials in buildings, electronic devices, and wearable devices are discussed. Challenges for further development of the hydrogel-based cooling materials are discussed as ending remarks.

show abstract

“…[90][91][92] Particularly, functional materials whose emission wavelengths or intensities can change significantly under mechanical forces like grinding, rubbing, and crushing, and can recover to their original state under external stimuli such as pressure release, heating, fuming, and recrystallization, are called MCL materials. [93][94][95] As one of the most important external stimuli-responsive materials, the MCL materials have been widely used in the fields of OLEDs, information anti-counterfeit, sensors, memory chips, etc. Recent studies have shown that the MCL characteristics primarily originate from either conformational isomerization or compact intermolecular interactions in condensed states.…”

Section: Mechanochromic Luminescence (Mcl)mentioning

confidence: 99%