Viskoelastische konjugierte polymere Fluide

Shinohara, Akira; Pan, Chengjun; Guo, Zuoxing; Zhou, Liyang; Z, Liu; Du, Lei; Yan, Zhi-Chao; Stadler, Florian J.; Wang, Lei; Nakanishi, Takashi

doi:10.1002/ange.201903148

“…So far, the complex viscosity (| η *|) and G ′ of alkyl–π FMLs have been controlled by altering the substitution position and the length of the branched‐alkyl chains [22,23] . The strategy of increasing G ′ has also been demonstrated in the case of alkyl–π conjugated polymer fluids, [24–26] where G ′ can be controlled by more than five orders of magnitude depending on the branched alkyl chain length [25] . However, since arranging the chemical structure for every alkyl–π conjugated polymer fluid is a complicated and time‐consuming process, a simple method of controlling G ′ over a broader range is required to expand the usefulness of alkyl–π FMLs.…”

Section: Figurementioning

confidence: 99%

Alkyl–π Functional Molecular Gels: Control of Elastic Modulus and Improvement of Electret Performance

Tateyama,

Nagura,

Yamanaka

et al. 2024

Angewandte Chemie

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The development of optoelectronically‐active soft materials is drawing attention to the application of soft electronics. A room‐temperature solvent‐free liquid obtained by modifying a π‐conjugated moiety with flexible yet bulky alkyl chains is a promising functional soft material. Tuning the elastic modulus (G′) is essential for employing optoelectronically‐active alkyl–π liquids in deformable devices. However, the range of G′ achieved through the molecular design of alkyl–π liquids is limited. We report herein a method for controlling G′ of alkyl–π liquids by gelation. Adding 1 wt% low‐molecular‐weight gelator formed the alkyl–π functional molecular gel (FMG) and increased G′ of alkyl–π liquids by up to seven orders of magnitude while retaining the optical properties. Because alkyl–π FMGs have functional π‐moieties in the gel medium, this new class of gels has a much higher content of π‐moieties of up to 59 wt% compared to conventional π‐gels of only a few wt%. More importantly, the gel state has a 23% higher charge‐retention capacity than the liquid, providing better performance in deformable mechanoelectric generator‐electret devices. The strategy used in this study is a novel approach for developing next‐generation optoelectronically‐active FMG materials.

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“…So far, the complex viscosity (| η *|) and G ′ of alkyl–π FMLs have been controlled by altering the substitution position and the length of the branched‐alkyl chains [22,23] . The strategy of increasing G ′ has also been demonstrated in the case of alkyl–π conjugated polymer fluids, [24–26] where G ′ can be controlled by more than five orders of magnitude depending on the branched alkyl chain length [25] . However, since arranging the chemical structure for every alkyl–π conjugated polymer fluid is a complicated and time‐consuming process, a simple method of controlling G ′ over a broader range is required to expand the usefulness of alkyl–π FMLs.…”

Section: Figurementioning

confidence: 99%

Alkyl–π Functional Molecular Gels: Control of Elastic Modulus and Improvement of Electret Performance

Tateyama,

Nagura,

Yamanaka

et al. 2024

Angew Chem Int Ed

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0

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The development of optoelectronically‐active soft materials is drawing attention to the application of soft electronics. A room‐temperature solvent‐free liquid obtained by modifying a π‐conjugated moiety with flexible yet bulky alkyl chains is a promising functional soft material. Tuning the elastic modulus (G′) is essential for employing optoelectronically‐active alkyl–π liquids in deformable devices. However, the range of G′ achieved through the molecular design of alkyl–π liquids is limited. We report herein a method for controlling G′ of alkyl–π liquids by gelation. Adding 1 wt% low‐molecular‐weight gelator formed the alkyl–π functional molecular gel (FMG) and increased G′ of alkyl–π liquids by up to seven orders of magnitude while retaining the optical properties. Because alkyl–π FMGs have functional π‐moieties in the gel medium, this new class of gels has a much higher content of π‐moieties of up to 59 wt% compared to conventional π‐gels of only a few wt%. More importantly, the gel state has a 23% higher charge‐retention capacity than the liquid, providing better performance in deformable mechanoelectric generator‐electret devices. The strategy used in this study is a novel approach for developing next‐generation optoelectronically‐active FMG materials.

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Highly Processable Covalent Organic Framework Gel Electrolyte Enabled by Side‐Chain Engineering for Lithium‐Ion Batteries

Zhang

¹

,

Liu

²

,

Zhang

³

et al. 2021

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Although covalent organic frameworks (COFs) with agraphene-like structure present unique chemical and physical properties,t hey are essentially insoluble and infusible crystalline powders with poor processability,h indering their further practical applications.H ow to improve the processability of COF materials is am ajor challenge in this field. In this contribution, we proposed ag eneral side-chain engineering strategy to construct ag el-state COF with high processability. This method takes advantages of large and soft branched alkyl side chains as internal plasticizers to achieve the gelation of the COF.W es ystematically studied the influence of the length of the side chain on the COF gel formation. Benefitting from their machinability and flexibility,this novel COF gel can be easily processed into gel-type electrolytes with specific shape and thickness,w hich were further applied to assemble lithium-ion batteries that exhibited high cycling stability.

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Viskoelastische konjugierte polymere Fluide

Cited by 8 publications

References 55 publications

Alkyl–π Functional Molecular Gels: Control of Elastic Modulus and Improvement of Electret Performance

Alkyl–π Functional Molecular Gels: Control of Elastic Modulus and Improvement of Electret Performance

Alkyl–π Functional Molecular Gels: Control of Elastic Modulus and Improvement of Electret Performance

Highly Processable Covalent Organic Framework Gel Electrolyte Enabled by Side‐Chain Engineering for Lithium‐Ion Batteries

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