Enhanced Dielectric Properties of All-Cellulose Composite Film via Modulating Hydroxymethyl Conformation and Hydrogen Bonding Network

Li, De-Long; Shi, Shao-Cong; Lan, Ke-Yu; Liu, Chunyan; Li, Yue; Xu, Ling; Lei, Jun; Zhong, Gan‐Ji; Huang, Hua‐Dong; Li, Zhong‐Ming

doi:10.1021/acsmacrolett.3c00224

Cited by 14 publications

(3 citation statements)

References 54 publications

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“…Another approach was, therefore, needed to lower the Dk further. Dk values are not only affected by chemical structure but also by high-order structures, such as crystalline structure. , In addition, dielectric loss (Df), the energy dissipated as heat in a dielectric material, is another contributing factor to transmission loss and should be reduced. Here, we thoroughly investigated the effect of crystallization on the Dk and Df values of polysaccharide esters.…”

Section: Resultsmentioning

confidence: 99%

Manufacturing Low Dielectric Polysaccharide Esters with High Thermal Stability

Fukata,

Kimura,

Iwata

2024

ACS Appl. Polym. Mater.

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We aimed to produce biomass-based plastics derived from polysaccharides for use in electrical devices, such as printed circuit boards (PCBs). We systematically investigated the combination of polysaccharides and side chain structures to achieve specific properties, notably a high glass transition temperature (T g ), for processes like soldering, and a low dielectric constant (Dk) to minimize electrical transmission loss. Three polysaccharides were selected as backbone structures: cellulose (β-1,4-glucan), paramylon (β-1,3-glucan), and α-1,3-glucan. Three types of side chain structures were then introduced: linear, branched, and cyclic, leading to 40 derivatives. Among them, α-1,3-glucan with cyclohexane carboxylate side chains exhibited the most promising properties combining high T g : 205 °C and low Dk: 2.7. Additionally, improving the crystallinity resulted in a further reduction of Dk to 2.5. The high T g and low Dk properties were comparable to, or surpassed, those of conventional polymers used in PCBs, such as epoxy and polyimide (>200 °C, 3−4). Polysaccharide esters are therefore another viable option as insulating polymers in electrical devices.

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Section: Resultsmentioning

confidence: 99%

Manufacturing Low Dielectric Polysaccharide Esters with High Thermal Stability

Fukata,

Kimura,

Iwata

2024

ACS Appl. Polym. Mater.

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“…Inspired by nature, protein-mimicking strategy has been proven effective for ideal properties . Self-assembly reinforcement through proper arrangement of secondary structures may also achieve efficient energy dissipation and the subsequent outstanding mechanical property. − Under inspiration, molecular conformational change and formation of hierarchical structures become important research points, and thus reinforcement exhibits obvious superiority in forming highly mechanically compatible networks, which can furthest shed the concerns for second phases. − The dissipation system is composed of stiff β-sheet crystalline for high strength and extendable α-helix and random coils for long elongation. For example, Lang et al designed copolymers with reinforced structures, spontaneously forming poly(ethylene oxide) crystalline areas and poly(styrene) amorphous areas for artificial muscle applications .…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly Reinforced Alginate Fibers for Enhanced Strength, Toughness, and Bone Regeneration

Cui,

Liu,

Xie

et al. 2024

Biomacromolecules

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Material reinforcement commonly exists in a contradiction between strength and toughness enhancement. Herein, a reinforced strategy through self-assembly is proposed for alginate fibers. Sodium alginate (SA) microstructures with regulated secondary structures are assembled in acidic and ethanol as reinforcing units for alginate fibers. Acidity increases the flexibility of the helix and contributes to enhanced extendibility. Ethanol is responsible for formation of a stiff β-sheet, which enhances the modulus and strength. The structurally engineered SA assembly exhibits robust mechanical compatibility, and thus reinforced alginate fibers possess an improved tensile strength of 2.1 times, a prolonged elongation of 1.5 times, and an enhanced toughness of 3.0 times compared with SA fibers without reinforcement. The reinforcement through self-assembly provides an understanding of strengthening and toughening mechanism based on secondary structures. Due to a similar modulus with bones, reinforced alginate fibers exhibit good efficacy in accelerating bone regeneration in vivo.

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“…Additionally, physical treatments like multi-step stretching can avoid using additives. In the wet-spinning production, stretching can increase crystallinity by improving molecular orientation in fibers, resulting in higher stiffness and tensile strength [21][22][23][24]. An ultra-stiff chitosan fiber is reported with a modulus as high as 44.7 GPa [18].…”

Section: Introductionmentioning

confidence: 99%

Constructing Stiff β-Sheet for Self-Reinforced Alginate Fibers

Xie,

Cui,

Wang

et al. 2024

Materials

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The application of alginate fibers is limited by relatively low mechanical properties. Herein, a self-reinforcing strategy inspired by nature is proposed to fabricate alginate fibers with minimal changes in the wet-spinning process. By adapting a coagulation bath composing of CaCl2 and ethanol, the secondary structure of sodium alginate (SA) was regulated during the fibrous formation. Ethanol mainly increased the content of β-sheet in SA. Rheological analysis revealed a reinforcing mechanism of stiff β-sheet for enhanced modulus and strength. In combination with Ca2+ crosslinking, the self-reinforced alginate fibers exhibited an increment of 39.0% in tensile strength and 71.9% in toughness. This work provides fundamental understanding for β-sheet structures in polysaccharides and a subsequent self-reinforcing mechanism. It is significant for synthesizing strong and tough materials. The self-reinforcing strategy involved no extra additives and preserved the degradability of the alginate. The reinforced alginate fibers exhibited promising potentials for biological applications.

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Enhanced Dielectric Properties of All-Cellulose Composite Film via Modulating Hydroxymethyl Conformation and Hydrogen Bonding Network

Cited by 14 publications

References 54 publications

Manufacturing Low Dielectric Polysaccharide Esters with High Thermal Stability

Manufacturing Low Dielectric Polysaccharide Esters with High Thermal Stability

Self-Assembly Reinforced Alginate Fibers for Enhanced Strength, Toughness, and Bone Regeneration

Constructing Stiff β-Sheet for Self-Reinforced Alginate Fibers

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