Novel polyrotaxane cross-linkers as a versatile platform for slide-ring silicone

Tran, Jakob-Anhtu; Madsen, Jeppe; Skov, Anne Ladegaard

doi:10.1088/1748-3190/abdd9f

Cited by 7 publications

(8 citation statements)

References 32 publications

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“…(c) A polysiloxane network crosslinked by vinyl modified polyrotaxanes. Reproduced with permission [33] . 2021, IOP Publishing.…”

Section: Functional Soft Materials With Slidable Crosslinkingmentioning

confidence: 99%

Cyclodextrins‐Based Polyrotaxanes: From Functional Polymers to Applications in Electronics and Energy Storage Materials

Du,

Bao,

Kong

et al. 2024

ChemPlusChem

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The concept of polyrotaxane comes from the rotaxane structure in the supramolecular field. It is a mechanically interlocked supramolecular assembly composed of linear polymer chains and cyclic molecules. Over recent decades, the synthesis and application of polyrotaxanes have seen remarkable growth. Particularly, cyclodextrin‐based polyrotaxanes have been extensively reported due to the low‐price raw materials, good biocompatibility, and ease of modification. Hence, it is also one of the most promising mechanically interlocking supramolecules for wide industrialization in the future. Polyrotaxanes are widely introduced into materials such as elastomers, hydrogels, and engineering polymers to improve their mechanical properties or impart functionality to the materials. In these materials, polyrotaxane acts as a slidable cross‐linker to dissipate energy through sliding or assist in dispersing stress concentration in the cross‐linked network, thereby enhancing the toughness of the materials. Further, the unique sliding‐ring effect of cyclodextrin‐based polyrotaxanes has pioneered advancements in stretchable electronics and energy storage materials. This includes their innovative use in stretchable conductive composite and binders for anodes, addressing critical challenges in these fields. In this mini‐review, our focus is to highlight the current progress and potential wider applications in the future, underlining their transformative impact across various domains of material science.

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“…(c) A polysiloxane network crosslinked by vinyl modified polyrotaxanes. Reproduced with permission [33] . 2021, IOP Publishing.…”

Section: Functional Soft Materials With Slidable Crosslinkingmentioning

confidence: 99%

Cyclodextrins‐Based Polyrotaxanes: From Functional Polymers to Applications in Electronics and Energy Storage Materials

Du,

Bao,

Kong

et al. 2024

ChemPlusChem

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“…As shown in Figure 3a, DEA_1100 μm_3 can be maximally actuated to a strain of 30% at 4300 V-a much larger actuation strain than the reported maximum strains of 10-15% for conventional siliconebased DEAs. [31,[37][38][39] This increased strain threshold can be attributed to the low modulus even being highly stretched. By decreasing the initial thickness or increasing the prestretch, DEAs can be actuated to the same strains at much lower voltages.…”

Section: Actuation Performances Of Deasmentioning

confidence: 99%

Highly Stretchable Silicone Elastomer Applied in Soft Actuators

Albuquerque

Madsen

et al. 2022

Macromol. Rapid Commun.

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In this work, a highly stretchable silicone elastomer is incorporated into dielectric elastomer actuators (DEAs) in order to decrease operation voltages by applying high prestretches. Results show that the fabricated DEAs (5 mm diameter circle active region) can be actuated to a lateral strain of 30% at 4.3 kV for a 122 μm thick prestretched film, and to a lateral strain of 2.5% at only 250 V for a 6.9 μm thick prestretched film. Due to the significant viscous component of the silicone elastomer, the DEAs respond more slowly (2-14 s to reach 90% of full strain) and show greater strain changes over time compared to conventional silicone-based DEAs. While this inherent viscosity is not universally favorable, it can be advantageous in applications where actuator damping is desirable. The studied DEAs' mean lifetimes under DC actuation range significantly-from 0.9 h to more than 123.0 h-depending mainly on initial electrical fields (17.8-36.3 V μm −1 ). For instance, DEAs with a 150 μm initial thickness and a prestretch ratio of 3 show 1.4-2.6% lateral strains for the mean lifetime (123.0 h) at only 300 V. Given the strains achieved at low voltage, such DEAs show promise for applications that do not require fast response speeds.

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“…The time-scales for the elongations are determined from the Hencky strain rate (𝜀 𝑑𝐿/𝑑𝑡 /𝐿 𝑡 ) , where 𝑑𝐿/𝑑𝑡 is the change in length with time. 23 The inverse Hencky strain rates (1/𝜀 ) are plotted against the strain at different elongation rates (Figure 2c) to give an idea of the permissible timescales for relaxation at different stages of the elongations. Subsequently, the time-scalesf are compared to 𝜏 of the network.…”

Section: The Design Of Pdms Tpementioning

confidence: 99%

Autonomously self-healing dielectric elastomer actuators from thermoplastic polydimethylsiloxane elastomer

Jeong

Daugaard

Skov

2021

Electroactive Polymer Actuators and Devices (EAPAD) XXIII

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Dielectric elastomer actuators (DEAs) are usually operated at high voltage to induce sufficient electric pressure between two compliant electrodes sandwiching the dielectric elastomer. However, a harsh environment (e.g. humid environment combined with high voltage) often induces electrical breakdown (EB) of the DEAs, which results in pinhole formation or even tearing of the device, followed by macroscopic failure. Therefore, it is ideal for DEAs to be self-healing to extend robustness and lifetime, such as observed for biological muscles, which can be healed from injuries by inherent biological processes. Herein, we prepared a soft (Young's modulus: 187 kPa) polydimethylsiloxane (PDMS) thermoplastic elastomer (TPE) to demonstrate an autonomous self-healing ability. The system exploits hydrogen bonding (H-bonding) in two types of transient cross-linkers: urea group serves as a sacrificial bond under loading and ureidopyrimidone (UPy) serves as a strong, load-carrying crosslinker. The PDMS TPE shows a crossover of the elastic moduli at 119 °C and highly frequency dependent elastic modulus. The DEA is prepared with compliant, corrugated silver electrodes on both sides of a corrugated PDMS TPE film. A maximum actuation strain (6.8 % in longitudinal direction) is achieved at 18.8 V μm -1 . A further increase in potential does not increase the actuation strain, but EBs are observed on the electrodes and the actuation is maintained without any detrimental effects to the film despite the previous breakdown. The EBs do not form permanent pinholes, nor do they cause tearing of films. Instead, only the removal of the silver electrode is observed, which is the so-called self-clearing effect commonly observed for metallic electrodes. In combination with the self-clearing effect, the heat generated by the EBs allows the PDMS TPE to soften. The polymer molecules are then capable of flowing into the voids that were created at the initiation of the EBs. As a result, further propagation of the EB is hindered, and instead, an instantaneous and autonomous self-healing of the DEA is observed.

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Novel polyrotaxane cross-linkers as a versatile platform for slide-ring silicone

Cited by 7 publications

References 32 publications

Cyclodextrins‐Based Polyrotaxanes: From Functional Polymers to Applications in Electronics and Energy Storage Materials

Cyclodextrins‐Based Polyrotaxanes: From Functional Polymers to Applications in Electronics and Energy Storage Materials

Highly Stretchable Silicone Elastomer Applied in Soft Actuators

Autonomously self-healing dielectric elastomer actuators from thermoplastic polydimethylsiloxane elastomer

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