Self-healing quadruple shape memory hydrogels based on coordination, borate bonds and temperature with tunable mechanical properties

Wang, Minying; Zhuge, Juanping; Li, Chaoqun; Jiang, Long; Yang, Hua

doi:10.1007/s13726-020-00821-9

Cited by 16 publications

(8 citation statements)

References 44 publications

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“…The maximum tensile strength of the cured ETHP-9 films was 12.74% higher than that of the cured ETMP-9 films (27.63 MPa), presumably because of the nitrogen heterocyclic rigid structures in ETHP- n . The tensile strength of cured ETHP-9 film is higher than those of most reported epoxy ,− and superior to most previously reported shape-memory polymers − (Figure S6). After seven cycles of shape-memory testing for cured ETHP- n films and five cycles for cured ETMP- n films, their tensile strength and elongation at the break only suffered a slight decrease.…”

Section: Resultsmentioning

confidence: 50%

High Mechanical Strength of Shape-Memory Hyperbranched Epoxy Resins

Lu¹,

Xu²,

Liang³

et al. 2022

ACS Appl. Polym. Mater.

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Shape-memory epoxy resin (SMER) with strong mechanical properties have potential for a wide range of applications, but the design and synthesis of SMER with both high mechanical property and short shape recovery time are still a challenge. Hyperbranched epoxy resin shape-memory materials offer a unique approach that has been investigated by very few researchers because of the tedious synthetic process. In this work, serial hyperbranched epoxy resins with different molecular weights and structures (ETMP-n, ETHP-n, n = 6, 9, 11) were synthesized by a simple highly efficient thiol-maleimide click reaction. Cured ETHP-n films display shape fixity ratios and shape recovery ratios as high as 98.5% and 97.2% after seven shape-memory cycles, respectively. Cured ETMP-9 and ETHP-9 films demonstrate rapid response, with shape recovery times as short as 450 and 430 ms, respectively, which are significantly shorter than previously reported shape-memory epoxy resins. The maximum actuated stress of cured films reaches 0.72 MPa, which was much higher than that of most mammalian skeletal muscles (0.35 MPa). Cured ETHP-9 films exhibited higher shape-memory performances than cured ETMP-9 films because of nitrogen heterocyclic rigid structures, appropriately high crosslink density and narrower molecular weight distribution. These excellent shape-memory performances make the hyperbranched epoxy resins suitable for practical applications in microelectronic devices and artificial muscles.

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Section: Resultsmentioning

confidence: 50%

High Mechanical Strength of Shape-Memory Hyperbranched Epoxy Resins

Lu¹,

Xu²,

Liang³

et al. 2022

ACS Appl. Polym. Mater.

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“…This system consisted of multiple interactions: hydrogen bonds formed between PAM and CMGG/Au@ PDA networks, 44 covalent bonds between PAM and CMGG, as well as boron−oxygen bonds between borax and CMGG, beneficial for high mechanical performance. 50,51 Characterization of Hydrogel and Au@PDA. Figure 1a displayed the ATR-FTIR spectrum of the CMGG 1.5 /PAM-Au@PDA 5 conductive hydrogel.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Stretchable Semi-Interpenetrating Carboxymethyl Guar Gum-Based Composite Hydrogel for Moisture-Proof Wearable Strain Sensor

et al. 2023

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Wearable strain sensors of conductive hydrogels have very broad application prospects in electronic skins and human–machine interfaces. However, conductive hydrogels suffer from unstable signal transmission due to environmental humidity and inherent shortcomings of their materials. Herein, we introduce a novel moisture-proof conductive hydrogel with high toughness (2.89 MJ m–3), mechanical strength (1.00 MPa), and high moisture-proof sensing performance by using dopamine-functionalized gold nanoparticles as conductive fillers into carboxymethyl guar gum and acrylamide. Moreover, the hydrogel can realize real-time monitoring of major and subtle human movements with good sensitivity and repeatability. In addition, the hydrogel-assembled strain sensor exhibits stable sensing signals after being left for 1 h, and the relative resistance change rate under different strains (25–300%) shows no obvious noise signal up to 99% relative humidity. Notably, the wearable strain sensing is suitable for wearable sensor devices with high relative humidity.

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“…Yang et al synthesized a quadruple-shape-memory hydrogel using polyacrylamide (PAM), oxidized sodium alginate (OSA), and PVA to induce OSA–Ca 2+ , PVA–borax, and OSA–PAM supramolecular interactions based on imine, coordination, and borate bonds. 64 Guo et al synthesized a dynamic dual cross-link vitrimer using dithiol-bearing boronic ester cross-linked with epoxidized natural rubber. Besides the dynamic boronic ester bonds, they incorporated metal–ligand coordination bonds using zinc to form noncovalent Zn 2+ –O coordination bonds (Fig.…”

Section: Materials Design With Dynamic Boronic Ester Bondsmentioning

confidence: 99%