Effects of dynamic covalent bond multiplicity on the performance of vitrimeric elastomers

Yu, Shuangjian; Zhang, Ganggang; Wu, Siwu; Tang, Zhenghai; Guo, Baochun; Zhang, Liqun

doi:10.1039/d0ta06264b

Cited by 47 publications

(35 citation statements)

References 61 publications

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“…As an example, Guan et al reported a covalently crosslinked yet malleable polybutadiene via Grubbs' Ru catalyzed olefin metathesis. 11 Besides, a variety of DCBs, including β-hydroxyl ester bonds, 12,13 imine bonds, 14,15 boronic ester bonds, 16 acetal, 17 and silyl ether, 18 have been researched in elastomer vitrimers.…”

Section: Introductionmentioning

confidence: 99%

Molecularly engineered dual-crosslinked elastomer vitrimers with superior strength, improved creep resistance, and retained malleability

Wang¹,

Liu

Qiao

et al. 2022

Polym. Chem.

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Section: Introductionmentioning

confidence: 99%

Molecularly engineered dual-crosslinked elastomer vitrimers with superior strength, improved creep resistance, and retained malleability

Wang¹,

Liu

Qiao

et al. 2022

Polym. Chem.

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“…In our previous work, we demon-strate that epoxy-functionalized SBR could be successfully prepared by introducing GMA during emulsion polymerization of SBR. [41,44,45] Hence, the modification method provides a promising strategy to prepare various kinds of functionalized SBR.…”

Section: Introductionmentioning

confidence: 99%

Thermal Reprocessing and Closed‐Loop Chemical Recycling of Styrene‐Butadiene Rubber Enabled by Exchangeable and Cleavable Acetal Linkages

Zhang

Tian

Feng

et al. 2022

Macromol. Rapid Commun.

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The covalent cross‐linking is an essential prerequisite for achieving the unique entropic elasticity of rubber products; however, the formation of a 3D cross‐linked network and permanent cross‐links makes thermosetting rubbers difficult to be recycled, causing serious environmental pollution at the end of their life. Herein, a facile, green, and promising strategy to introduce the exchangeable and cleavable acetal bonds into the chemically cross‐linked networks of diene‐typed rubbers is reported. For the first time, the hydroxyl‐functionalized styrene‐butadiene rubber (ESBR‐HEMA) is prepared by introducing 2‐hydroxyethyl methacrylate (HEMA) during the emulsion polymerization of styrene‐butadiene rubber (ESBR). Then, based on hydroxyl‐vinyl ether addition reactions, divinyl ether (DVE) could serve as a cross‐linking agent to facilely and effectively cross‐link hydroxyl‐functionalized rubbers without additional additives, producing exchangeable and hydrolyzable acetal linkages. What's more, the acetal‐containing cross‐linked network in ESBR‐HEMA vulcanizates could rearrange their topologies at elevated temperatures, endowing them with malleable and thermal reprocessing abilities. Moreover, the hydrolyzable acetal bonds could be selectively cleaved into hydroxyl and aldehyde groups in acidic conditions, resulting in a closed‐loop chemical recycling of the ESBR‐HEMA rubber. Hence, this work provides a facile and green cross‐linking strategy for hydroxyl‐functionalized rubbers to address the inherent problems brought from the covalent cross‐linking of rubbers.

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“…However, due to the difficulties in synthesizing polymers with several dynamic covalent bonds and activating different dynamic bonds separately, there are few reports about the interactions between different dynamic covalent bonds in polymeric materials. [31,32] Our group has reported that diselenide bond as one kind of dynamic covalent bond that could be activated under mild visible light irradiation, and then the metathesis reaction will occur. [33,34] The unique activation condition of diselenide bonds should be orthogonal to most of the stimulating conditions of other dynamic covalent bonds.…”

Section: Introductionmentioning

confidence: 99%

When Dynamic Diselenide Bonds Meet Dynamic Imine Bonds in Polymeric Materials

Cao

Zhao

Liu

et al. 2022

Macromol. Rapid Commun.

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In both natural and artificial functional systems, the cooperation between different dynamic interactions is of vital importance for realizing complicated functions. Dynamic covalent bonds are one kind of relatively stable dynamic interactions and have shown synergistic effect in natural systems such as functional proteins. However, synergistic interactions between different dynamic covalent bonds in polymeric materials are still unclear. Herein, polymeric materials containing diselenide and imine bonds are prepared, and then the synergistic effect between the two dynamic covalent bonds is quantitatively evaluated in typical processes of dynamic materials. The results reveal that dynamic covalent bonds show weak synergistic effect in the degradation process and have strong synergistic effect in stress relaxation process. Therefore, introducing multiple dynamic covalent bonds in polymeric materials can extensively enhance their dynamic properties.

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Effects of dynamic covalent bond multiplicity on the performance of vitrimeric elastomers

Abstract: It is still a challenge to integrate multiple dynamic covalent bonds (DCBs) into one network, so the effects of DCBs multi-plicity on the performance of covalent adaptive networks (CANs) is...

Cited by 47 publications

References 61 publications

Molecularly engineered dual-crosslinked elastomer vitrimers with superior strength, improved creep resistance, and retained malleability

Molecularly engineered dual-crosslinked elastomer vitrimers with superior strength, improved creep resistance, and retained malleability

Thermal Reprocessing and Closed‐Loop Chemical Recycling of Styrene‐Butadiene Rubber Enabled by Exchangeable and Cleavable Acetal Linkages

When Dynamic Diselenide Bonds Meet Dynamic Imine Bonds in Polymeric Materials

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