The effect of latent plasticity on the shape recovery of a shape memory vitrimer

Chen, Fengbiao; Cheng, Qian; Gao, Fei; Zhong, Jiang; Shen, Liang; Lin, Cong; Lin, Yangju

doi:10.1016/j.eurpolymj.2021.110304

Cited by 25 publications

(18 citation statements)

References 48 publications

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“…Better‐quality epoxy composites can be made by adding nano fillers like CB that furnishes special properties in composites 27 . Thioether has been reported as an important ingredient in shape memory composites 28–30 . All three CB samples have been tested for their impact on cationic association of epoxy monomer, to picture their effect on epoxy polymerization kinetics, in diverse weight percentages.…”

Section: Resultsmentioning

confidence: 99%

“…27 Thioether has been reported as an important ingredient in shape memory composites. [28][29][30] All three CB samples have been tested for their impact on cationic association of epoxy Different wt% of CB (1, 3, 5, and 10) were used to prepare CB-epoxy composites. Tack free time of epoxy with different PI concentrations was performed.…”

Section: Composite Analysismentioning

confidence: 99%

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Controlled cationic curing of epoxy composites with photochemically modified silanol encapsulated carbon black

Atif

Hussain

Rani

et al. 2022

J of Applied Polymer Sci

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Epoxy resins have been an inspiration in adhesives and coatings, however, uneven photopolymerization kinetics result in wrinkled surface and filler segregation, causing aesthetic and mechanical damage. Hence a control over curing kinetics is required not only to dodge filler segregation but also to control composite surface smoothness. In this study, photochemical modification of carbon black with mercaptopropyltrimethoxysilane, has resulted in unique silanol dendrites exterior on carbon black. Kinetic investigation confirmed that Ea for cationic polymerization of modified CB composite is three folds less in comparison to neat matrix, and two folds less in comparison to unmodified CB composite. Silanol dendrites have contributed on epoxy curing kinetics, through activated monomer mechanism. Samples have been characterized through XPS, FTIR, SEM, TGA, DSC, Raman, and EDX.

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Section: Resultsmentioning

confidence: 99%

Section: Composite Analysismentioning

confidence: 99%

Controlled cationic curing of epoxy composites with photochemically modified silanol encapsulated carbon black

Atif

Hussain

Rani

et al. 2022

J of Applied Polymer Sci

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“…As shown in Figure 3E ; Supplementary Figures S1–S4 , the variation curve of relaxation time with temperature according to the Arrhenius equation, which is given by Eq. 2 ( Chen et al, 2021 ; Spiesschaert et al, 2021 ; Zhao et al, 2021 ).

where

is the relaxation time at infinite temperature, R is the universal gas constant, and E a express the activation energy.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 3E; Supplementary Figures S1-S4, the variation curve of relaxation time with temperature according to the Arrhenius equation, which is given by Eq. 2 (Chen et al, 2021;Spiesschaert et al, 2021;Zhao et al, 2021).…”

Section: Stress-relaxation Behaviors Of Dynamic Epoxy Resin Networkmentioning

confidence: 99%

Exploring of the property of epoxy resins based on diselenide and disulfide dynamic linkers

Wei

Liu²,

Guo³

et al. 2022

Front. Chem.

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Over the last decade, there has been a lot of interest in incorporating dynamic covalent bonds (DCBs) into epoxy resins. Because diselenide and disulfide bonds have similar properties, they are frequently used as DCBs in self-healing epoxy networks. In this paper, we present diselenide and disulfide dynamic linkers containing epoxy networks by analyzing the effects of mechanical properties, thermal stability, activation energies, and self-healing properties. The glass transition temperature (Tg) values, mechanical properties, crosslinking density (ve), and thermal stability of disulfide linkers networks were higher than those of diselenide linkers networks, according to our research. The activation energies of disulfide linkers were higher than those of diselenide linkers (up to 14 kJ/mol), but their healing efficiency was lower than that of the diselenide network. These findings demonstrate the advantages of diselenide and disulfide dynamic linkers in epoxy networks systems, as well as a method for designing and preparing the appropriate diselenide dynamic linkers or disulfide dynamic linkers incorporated into epoxy networks for the appropriate application and processing technology.

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“…Sumerlin et al [ 30 ] produced ethylene vitrimers with acetoacetate-functional groups using cheap commercial monomers; the obtainable vitrimers showed considerable reprocessing ability (4 cycles, at 160 °C) and good mechanical properties (1.8 GPa, at RT). Our group recently synthesized bio-based multifunctional acetoacetate-functional vitrimer from limonene and castor oil, and it demonstrated excellent self-healing properties and can be recycled numerous times [ 31 , 32 , 33 ]. The vinylogous urethane bond-forming network provides excellent mechanical capabilities and good recyclability.…”

Section: Introductionmentioning

confidence: 99%

Self-Healable Covalently Adaptable Networks Based on Disulfide Exchange

Guo

Liu

et al. 2022

Polymers

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Introducing dynamic covalent bonding into thermoset polymers has received considerable attention because they can repair or recover when damaged, thereby minimizing waste and extending the service life of thermoset polymers. However, most of the yielded dynamic covalent bonds require an extra catalyst, high temperature and high-pressure conditions to trigger their self-healing properties. Herein, we report on a catalyst-free bis-dynamic covalent polymer network containing vinylogous urethane and disulfide bonds. It is revealed that the introduction of disulfide bonds significantly reduces the activation energy (reduced from 94 kJ/mol to 51 kJ/mol) of the polymer system for exchanging and promotes the self-healing efficiency (with a high efficiency of 86.92% after being heated at 100 °C for 20 h) of the material. More importantly, the mechanical properties of the healed materials are comparable to those of the initial ones due to the special bis-dynamic covalent polymer network. These results suggest that the bis-dynamic covalent polymer network made of disulfide and inter-vinyl ester bonds opens a new strategy for developing high-performance vitrimer polymers.

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The effect of latent plasticity on the shape recovery of a shape memory vitrimer

Cited by 25 publications

References 48 publications

Controlled cationic curing of epoxy composites with photochemically modified silanol encapsulated carbon black

Controlled cationic curing of epoxy composites with photochemically modified silanol encapsulated carbon black

Exploring of the property of epoxy resins based on diselenide and disulfide dynamic linkers

Self-Healable Covalently Adaptable Networks Based on Disulfide Exchange

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