A facile one-pot route to elastomeric vitrimers with tunable mechanical performance and superior creep resistance

Li, Xiaoguang; Wu, Siwu; Yu, Shuangjian; Xiao, Chong; Tang, Zhenghai; Guo, Baochun

doi:10.1016/j.polymer.2021.124379

Cited by 23 publications

(26 citation statements)

References 38 publications

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“…† The values are suprisingly small (9.09 Â 10 À7 to 7.78 Â 10 À6 % s À1 ) and comparable to that of a conventional permanent network. 38,39 Based on the relationship between 3̇and temperature, the viscous ow activation energy E a was calculated to be 95.67 kJ mol À1 from the slope of the Arrhenius curve (Fig. S8), † which is fairly high compared with that of creep-resistance vitrimers.…”

Section: Creep and Chemical Resistancementioning

confidence: 99%

“…2 and other recyclable CANs in terms of temperature and applied stress. 12,24,25,28,29,31,32,37,[39][40][41][42]…”

Section: Creep and Chemical Resistancementioning

confidence: 99%

“…2 (a) Creep curves of A-PU 1.2 under stress of 1 MPa at different temperatures. (b) Creep curves of A-PU 1.2 under different levels of stresses at 140 C. (c) A comparison of creep behavior among A-PU 1.2 and other recyclable CANs in terms of temperature and applied stress 12,24,25,28,29,31,32,37,[39][40][41][42]. (d) SR, and (e) GR of A-PU 1.2 fragments immersed in different solvents for a month.…”

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confidence: 99%

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A dynamic polyurea network with exceptional creep resistance

Wang

Zhao

et al. 2022

J. Mater. Chem. A

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Section: Creep and Chemical Resistancementioning

confidence: 99%

“…2 and other recyclable CANs in terms of temperature and applied stress. 12,24,25,28,29,31,32,37,[39][40][41][42]…”

Section: Creep and Chemical Resistancementioning

confidence: 99%

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confidence: 99%

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A dynamic polyurea network with exceptional creep resistance

Wang

Zhao

et al. 2022

J. Mater. Chem. A

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“…Generally, the diene rubbers are crosslinked using sulfur (i.e., the vulcanization process), which, however, makes the recycling of scrap rubbers inherently difficult because the irreversible permanent crosslinking prevents the reprocessing of networks. Nowadays, many methods, such as burned for energy, reused as ground rubber, or landfilled disposal, have been used to achieve the reclamation of waste rubbers, which are usually less efficient, complicated, and eco-unfriendly. , Hence, a strategy is needed that enables “cradle to cradle” reclamation of waste rubbers. Building reprocessable networks based on dynamic covalent chemistry maybe an ideal one. , Dynamic covalent bonds can reversibly break and reform under stimuli such as heating.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, dynamic reversible reactions may be activated, and the creep would become serious which makes these materials unsuitable for applications requiring excellent dimensional stability and thermomechanical properties. Currently, several attempts have been made to address this issue, such as introducing partial permanent bonds − or intermolecular noncovalent interactions, − developing dynamic chemistry with high activation energies, ,− adjusting the amount and nature of catalysts, , or building microphase-separated network structures , to tune the exchange kinetics. However, considering that sulfur vulcanization is the most widely used crosslinking technology in the rubber industry, the above-mentioned strategies are not suitable for the industrial sulfur-vulcanized process due to the construction of complex polymer structures or the development of specific crosslinking bonds.…”

Section: Introductionmentioning

confidence: 99%

Recyclable Sulfur-Cured Rubbers with Enhanced Creep Resistance and Retained Mechanical Properties by Terminal Metal Coordination

Cao

Wang

et al. 2022

Ind. Eng. Chem. Res.

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The construction of dynamic covalent polymer networks (DCPNs) is an effective way to achieve the recycling of vulcanized rubbers. However, rubbers with DCPNs were susceptible to creep, causing poor dimensional stability which limits their applications. Sulfur vulcanization is the most widely used crosslinking technology in the rubber industry owing to its excellent comprehensive performance. It is of great importance to achieve the recyclability of sulfur-cured rubbers with improved creep resistance. Herein, the recyclable sulfur-cured polyisoprene rubber network was prepared by introducing a catalyst copper ion (Cu2+) to catalyze the disulfide metathesis reaction of inherent disulfide and polysulfide bonds. Then, the terminal hydroxyl and pyridyl groups were introduced into the polyisoprene chain to reduce the catalytic activity of Cu2+ at service temperature by coordinate interactions, thus improving the creep resistance. The resulting networks exhibited superior creep resistance even at a service temperature of 100 °C, although they had lower topology freezing transition temperatures (T vs), while the corresponding network rearrangement ability at elevated temperatures was not affected. Moreover, the recycled samples displayed excellent mechanical properties with tensile strengths exceeding 7 MPa and the elongation at break over 600%, which were significantly higher than those of most reported polydiene rubber systems with DCPNs in the literature. This work provides a strategy for designing recycled rubbers with enhanced creep resistance, sufficient tensile strength, and superior stretchability using industrial sulfur-vulcanized processes.

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Skeletal Network Enabling New‐Generation Thermoplastic Vulcanizates

Fang

et al. 2023

Advanced Materials

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Upcycling of cross‐linked rubbers is pressing. The introduction of dynamic covalent bonds into the networks is a popular tactic for recycling thermosetting polymers, but it is very challenging to integrate engineering performance and continuous yet stable reprocessability. Based on traditional rubber formulations, herein, a straightforward strategy is presented for constructing a skeletal network (SN) through interfacial crosslinking and percolation of rubbery granules in a rubber matrix. Rapid exchange reactions involving dynamic interfacial sulfides realize repeated “fragmentation and healing” in the solid‐state and consequent reconfiguration of the SN topology of the elastomer, thus endowing the resultant SN elastomer with continuous yet stable re‐extrudability. These SN elastomers with hierarchical structures exhibit high gel contents, high resilience, low creep, and reinforcibility competitive to traditional vulcanizates. Specifically, SN elastomers exhibit better overall performance than commercial thermoplastic vulcanizates (TPVs) materials. Overall, a new concept of thermoplastic vulcanizates is proposed, which will promote the sustainable development of rubbers.

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A facile one-pot route to elastomeric vitrimers with tunable mechanical performance and superior creep resistance

Cited by 23 publications

References 38 publications

A dynamic polyurea network with exceptional creep resistance

A dynamic polyurea network with exceptional creep resistance

Recyclable Sulfur-Cured Rubbers with Enhanced Creep Resistance and Retained Mechanical Properties by Terminal Metal Coordination

Skeletal Network Enabling New‐Generation Thermoplastic Vulcanizates

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