A Mortise‐and‐Tenon Joint Inspired Mechanically Interlocked Network

Zhao, Dong; Zhang, Zhaoming; Zhao, Jun; Liu, Kai; Liu, Yuhang; Li, Guangfeng; Zhang, Xinhai; Bai, Ruixue; Yang, Xue; Yan, Xuzhou

doi:10.1002/anie.202105620

Cited by 73 publications

(50 citation statements)

References 60 publications

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“…Virgin PVA shows a gradual increase in the strain throughout 300 min of creep testing. In comparison, upon the addition of 0.5–2.0 wt % IN, the strains of PVA-IN composites first experience a slow increase and level off, resulting in a long-term plateau, indicative of the presence of physical H-bond cross-linking networks in the three systems . With a further increase in IN contents, such a long-term plateau gradually disappears, implying that there is a very weak or even no physical network, probably because the excessive IN molecules form crystalline, which weakens the H-bonding interactions between PVA and IN.…”

Section: Resultsmentioning

confidence: 99%

“…experience a slow increase and level off, resulting in a longterm plateau, indicative of the presence of physical H-bond cross-linking networks in the three systems 39. With a further increase in IN contents, such a long-term plateau gradually disappears, implying that there is a very weak or even no physical network, probably because the excessive IN molecules form crystalline, which weakens the H-bonding interactions between PVA and IN.Giventhe above comprehensive analyses, a schematic illustration is proposed for nanostructured PVA-IN composites.…”

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confidence: 99%

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Bioinspired, Strong, and Tough Nanostructured Poly(vinyl alcohol)/Inositol Composites: How Hydrogen-Bond Cross-Linking Works?

Seraji

et al. 2021

Macromolecules

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Spider silk-inspired hydrogen-bond (H-bond) cross-linking has recently been shown to enable polymers, e.g., poly(vinyl alcohol) (PVA), to achieve high strength in combination with large ductility and great toughness by adding small H-bond cross-linkers. Unfortunately, the correlation of H-bond cross-linking to the microstructure and mechanical performances of the resultant polymers remains unclear. Herein, we prepare strong and tough nanostructured PVA composites with inositol (IN) molecules as cross-linkers. The addition of 1.0 wt % of IN increases the yield strength (σ y ) of PVA up to 148 MPa (by ∼31%), in combination with appreciable increases in the break strain (by 250%) and toughness (by 3.6-fold) because of dynamic physical cross-linking and crystalline grain refinement. We show that there exists a close but simple correlation between the H-bond crosslinking density (n e ) and σ y , the chain movement (e.g., glass transition temperature (T g ), relaxation activation energy (E a )) and the crystalline grain size (L), namely, σ y ∝ n e , T g , E a , and 1/L. This work casts light on the governing effect of H-bonding cross-linking on the microstructure and mechanical properties of PVA and unveils its correlation to mechanical properties, chain dynamics, and crystallization for the first time. These exciting findings open up many new opportunities for creating strong, tough, and ductile polymeric materials.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Bioinspired, Strong, and Tough Nanostructured Poly(vinyl alcohol)/Inositol Composites: How Hydrogen-Bond Cross-Linking Works?

Seraji

et al. 2021

Macromolecules

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“…The extreme stretchability of xerogel fiber ascribes to the energy dissipation in weak and reversible host-guest interactions. [13,14,45,46] The bipedal host molecules, P5-Azo-P5, slide along the polymer chains upon stretching force and act as crosslinkers to drag different polymer chains to be oriented along the stretching direction (Figure 1b), resulting in the partial phase transition from amorphous state to oriented crystalline microdomains or crystallites through SIC. The crystalline PCL chains align along the stretching direction and reach a high degree of orientation while the PEG segments connecting the PCL crystalline domains are forced to be partially extended.…”

Section: D Extension For Photoinduced Contraction Fibersmentioning

confidence: 99%

Photoinduced Contraction Fibers and Photoswitchable Adhesives Generated by Stretchable Supramolecular Gel

Wang

Liu

et al. 2022

Adv Funct Materials

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Dynamically crosslinked supramolecular networks have emerged in the last decades as extremely stretchable and self-healing materials thanks to the energy dissipation in weak and reversible interactions. Stretchable materials with tunable properties represent an effort to develop a charming class of smart devices. Once stretched, however, these materials' properties are usually fixed due to strain-induced crystallization (SIC), hindering their practical applications. Here, photoinduced contraction smart fibers and photoswitchable adhesives are generated from a dynamic supramolecular gel network, the SIC in which can be disrupted by UV irradiation to release the prestored strain energy. The dynamic sliding of azo-bridged bipedal host molecules along the polymer chains renders the extreme stretchability of supramolecular gel under stretching forces. The oriented crystalline microdomains or crystallites through SIC upon stretching serve as physical crosslinks to store the contractile energy of fibers and improve the adhesion force of adhesives, and then are disoriented induced by trans-to-cis isomerization of azobenzene mesogens to release the prestored strain energy, resulting in such contraction of fibers and reduction of adhesion strength of adhesives. This work provides inspiration for exploring the structure-property relationship of supramolecular networks and transforming their clear potential to fabricate more remarkable synthetic smart materials.

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“…Mechanically interlocked polymers, containing self-assembled crosslinking sites, possess high degrees of conformational freedom. [1][2][3] Thereby these polymers are widely used to construct elastomers and gels with high toughness, high elongation with low hysteresis, or high fracture energy. [4][5][6][7][8] As a typical kind of mechanically interlocked polymers, polyrotaxanes (PRs) are usually synthesized by host-guest self-assembly between macrocycles and linear axles.…”

Section: Introductionmentioning

confidence: 99%

Visualization of Solvent‐Induced Structure Evolution in Cyclodextrin Polyrotaxane Gels

Yang

et al. 2022

Macromol. Rapid Commun.

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Cyclodextrin (CD)-based polyrotaxanes (PR) are widely used to construct high-mechanical-performance materials because of the high degree of conformational freedom. However, strong hydrogen bonds between CDs greatly limit the application of CD-PR in the preparation of ductile neutral hydrogels. In this work, spiropyrane (SP) into 𝜶-CD-based PR is introduced to "visualize" the segment motion of the network in neutral water. The aggregation-induced cohesion and critical factors for the force transmission are disclosed. This system offers a new approach for the fundamental research for the complicated topologically cross-linked structures, which is important for the design of CD-PR-based biocompatible soft materials.

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A Mortise‐and‐Tenon Joint Inspired Mechanically Interlocked Network

Cited by 73 publications

References 60 publications

Bioinspired, Strong, and Tough Nanostructured Poly(vinyl alcohol)/Inositol Composites: How Hydrogen-Bond Cross-Linking Works?

Bioinspired, Strong, and Tough Nanostructured Poly(vinyl alcohol)/Inositol Composites: How Hydrogen-Bond Cross-Linking Works?

Photoinduced Contraction Fibers and Photoswitchable Adhesives Generated by Stretchable Supramolecular Gel

Visualization of Solvent‐Induced Structure Evolution in Cyclodextrin Polyrotaxane Gels

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