Preparation of three‐dimensional poly(dimethylsiloxane) (PDMS) with movable cross‐linking

Miki, Kazuya; Inamoto, Yasunari; Inoue, Setsuko; Uno, Takahiro; Itoh, Takahito; Kubo, Masataka

doi:10.1002/pola.23633

Cited by 9 publications

(4 citation statements)

References 30 publications

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“…Because the fabrication method involves the “assembly” of individually formed components as if they are mosaics or toy blocks, we first prepared the stretchable electrodes and composite pieces separately. PDMS was used as the substrate for the stretchable electrode because of its high light transmittance, biocompatibility, chemical stability, and excellent elasticity. , PEDUB, by itself, is freestanding and has high ductility, but it is not suitable as a substrate for stretchable devices due to its low strength and poor resilience after stretching. However, the surface of pristine PDMS is known to be intrinsically hydrophobic, which restricts its use as a substrate for the deposition of another material.…”

Section: Resultsmentioning

confidence: 99%

Self-Integratable, Healable, and Stretchable Electroluminescent Device Fabricated via Dynamic Urea Bonds Equipped in Polyurethane

Shin

Lee

et al. 2020

ACS Appl. Mater. Interfaces

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Reversible bonding between polymer chains has been used primarily to induce self-healing of damaged polymers. Inspired by the dynamic nature of such bonding, we have developed a polyurethane equipped with dynamic urea bonds (PEDUB) that has high strength sufficient to make it be freestanding and have a healing capability and self-bonding property. This allowed subsequent heterogeneous multicomponent device integration of electrodes/substrate and light-emitting pixels into a light-emitting device. We first used the PEDUB to individually fabricate a highly stretchable electrode containing Ag nanowires and stretchable composites with ZnSbased particles. They were successfully assembled into a stretchable, waterproof electroluminescent (EL) device even under mild conditions (60 °C for 10 min) owing to the reversible exchange of urea bonds and low glass transition temperature of PEDUB. The assembled device with an AC-driven EL architecture retained excellent EL characteristics even after stretching, submersion in water, and cutting owing to the robust solid-state bonding interfaces induced by the dynamic urea bonds. Consequently, various shapes of the illuminating elastomer and an illuminated picture were realized for the first time using the mosaic-like assembly method. This first demonstration of multicomponent assembly paves the way for future stretchable multifunctional devices.

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Section: Resultsmentioning

confidence: 99%

Self-Integratable, Healable, and Stretchable Electroluminescent Device Fabricated via Dynamic Urea Bonds Equipped in Polyurethane

Shin

Lee

et al. 2020

ACS Appl. Mater. Interfaces

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“…43 They were subsequently applied to construct more complex polymer topologies either through the covalent linkage or even through the noncovalent, mechanical linkage uniquely formed by threading with ring polymer units. 44,45 It was also shown that network polymers formed from cyclic polymer precursors exhibited unique gel properties compared with conventional gels obtained with linear/ branched polymer precursors. 46 Moreover, the topological conversion of polymers between ring/linear and even between single-cyclic/dicyclic topologies has now been achieved.…”

Section: Synthetic Developments For Single-cyclic (Ring) and Multi-cy...mentioning

confidence: 99%

Topological polymer chemistry: a cyclic approach toward novel polymer properties and functions

2011

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Recent progress observed in Topological Polymer Chemistry is outlined with particular emphasis on single-cyclic (ring) and multi-cyclic polymers having programmed chemical structures, now becoming obtainable with guaranteed purity by newly developed synthetic protocols. By making use of these topological polymers, unprecedented opportunities have now been realized to provide new insights on fundamental polymer properties either in solution or bulk, in static or dynamic states, or in selfassemblies. Moreover, unusual properties and functions for polymer materials have now been revealed based on their cyclic topologies, i.e., topology effects, unattainable either by linear or branched counterparts.

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“…These isolated rings can be extracted by chloroform. On the other hand, a network connected by topological crosslinks, such as a rotaxane-crosslinked elastomer, is known to swell significantly in good solvents due to the inherent chain slipping [30]- [33]. Although the concatenated ring elastomer and the rotaxane-crosslinked elastomer are not exactly identical in terms of their molecular structures, they both possess movable linkages, which may allow the superior swelling ratio of 45 of the concatenated ring elastomer investigated herein.…”

Section: Long-term Swelling Experimentsmentioning

confidence: 97%

Soft silicone elastomers with no chemical cross-linking and unprecedented softness and stability

Huang

Madsen

et al. 2020

Electroactive Polymer Actuators and Devices (EAPAD) XXII

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For silicone elastomers used as actuators, softness is key for enabling actuation at low voltages. Recently, an extremely soft (Young's modulus < 50 kPa) silicone elastomer without cross-links has been reported by Goff et al. Besides its extreme softness, the elastomer was reported to almost completely recover (82%) from a 10-cycle elongation of more than 5000%. This observation challenges conventional elasticity theory of cross-linked elastomers because a network without covalent crosslinks should not be able to strain-recover to such extent. In this work, the elastomer is hypothesized to be formed from concatenated rings through heterodifunctional uni-molecular ring closure. It is found that the elastic properties of this uncross-linked elastomer can be described by the dynamics of concatenated rings, which act as pseudo-crosslinks and pseudo-entanglements. Isolated rings and dangling rings function as external solvents and internal solvents respectively, thereby contributing to the unprecedented softness. The ability to precisely control the ratio between concatenated and dangling rings is expected to lead to even softer dielectric elastomers paving the way forward for ultra-soft robotics without significant mechanical losses.

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Preparation of three‐dimensional poly(dimethylsiloxane) (PDMS) with movable cross‐linking

Cited by 9 publications

References 30 publications

Self-Integratable, Healable, and Stretchable Electroluminescent Device Fabricated via Dynamic Urea Bonds Equipped in Polyurethane

Self-Integratable, Healable, and Stretchable Electroluminescent Device Fabricated via Dynamic Urea Bonds Equipped in Polyurethane

Topological polymer chemistry: a cyclic approach toward novel polymer properties and functions

Soft silicone elastomers with no chemical cross-linking and unprecedented softness and stability

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