The dynamic chain effect on healing performance and thermo-mechanical properties of a polyurethane network

Zhang, Lei; Wang, Haiqing; Dai, Zenghui; Zhao, Zhongxiang; Fu, Feiya; Liu, Xiangdong

doi:10.1016/j.reactfunctpolym.2019.104444

Cited by 12 publications

(4 citation statements)

References 61 publications

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“…Up until now, researchers have successfully synthesized new adhesives based on DCBs, realizing the integration of advantages of TA and HMA. − Furthermore, a notable advantage of some DCB-based novel adhesives is that they can be precured into films and placed at the joints. This feature significantly improves the uniformity, reliability, and stable storage time of adhesives. − ,, Zhang et al synthesized cross-linked polyurethane adhesive films containing dynamic polyurea bonds using diisocyanate and piperazine. The lap shear tests showed that maximum adhesive strength to aluminum plates was 1.9 MPa, and the minimum strength loss rate after 10 cycles was 21.1% .…”

Section: Introductionmentioning

confidence: 99%

“…The lap shear tests showed that maximum adhesive strength to aluminum plates was 1.9 MPa, and the minimum strength loss rate after 10 cycles was 21.1%. 12 Wang et al constructed an oxime-carbamate based dynamic cross-linked polyurethane HMA. After bonding for 24 h, strength to stainless steel reached 5.71 MPa.…”

Section: Introductionmentioning

confidence: 99%

“…This feature significantly improves the uniformity, reliability, and stable storage time of adhesives. − ,, Zhang et al synthesized cross-linked polyurethane adhesive films containing dynamic polyurea bonds using diisocyanate and piperazine. The lap shear tests showed that maximum adhesive strength to aluminum plates was 1.9 MPa, and the minimum strength loss rate after 10 cycles was 21.1% . Wang et al constructed an oxime-carbamate based dynamic cross-linked polyurethane HMA.…”

Section: Introductionmentioning

confidence: 99%

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Dual Dynamic Cross-Linked Epoxy Vitrimers Used for Strong, Detachable, and Reworkable Adhesives

Huang,

Ding,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Novel reprocessable thermosetting adhesives (RTAs), which combine high adhesive strength, reusability, disassembly, and recyclability features, have attracted increasing attention. However, developing RTAs with a rapidly adhesive rate while ensuring high adhesive strength and self-healing ability is still a significant challenge. Here, we prepared a novel vitrimer called DAx−DTSAy, which can be used as an RTA. First, by adjusting the ratio of rigid and flexible segments, maximum tensile strength reached 35.92 MPa. Second, the combined effect of dynamic hydroxyl ester bonds and dynamic disulfide bonds resulted in a rapid stress relaxation behavior, with a complete relaxation time 13.6 times shorter than a vitrimer only cross-linked with hydroxy ester bonds. This feature endowed its good self-healing and reprocessing capabilities. After self-healing at 180 °C, the maximum healing rate of mechanical properties was 91.8%. After three reprocesses, the maximum recovery rate of tensile strength was 120.2%. Furthermore, the combination of rigid and flexible segments and the synergistic effect of dual dynamic covalent bonds made DAx−DTSAy capable of use as a high-performance RTA. The lap shear strength of a DAx−DTSAy film on stainless steel reached 18.18 MPa after 15 min, with a recovery rate of 91.9% after 5 rebonding cycles. Additionally, DAx−DTSAy can be disassembled in chemical agents and exhibited better insulation properties compared to traditional epoxy resins. DAx−DTSAy can be employed as a novel high-performance adhesive in applications such as electronic devices and transportation, contributing to the development of thermosetting adhesives toward recyclability and sustainability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dual Dynamic Cross-Linked Epoxy Vitrimers Used for Strong, Detachable, and Reworkable Adhesives

Huang,

Ding,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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“…On the contrary, intrinsic healable materials are realized through the developing polymer matrix with dynamic chemical bonds, which have the advantages of simple preparation, multiple-time healability, and admirable healing efficiency. Currently, the available dynamic bonds used for self-healing materials include but are not limited to disulfide bond exchange, , Diels–Alder reactions, , imine bonds, , dynamic hindered urea bonds, , hydrogen bonds, , transesterification, , and so on. Among them, the urea bond bearing a bulk group on the nitrogen atom can reversibly decompose into amine and isocyanate.…”

Section: Introductionmentioning

confidence: 99%

Insulating Silicones Based on Dynamic Hindered Urea Bonds with High Dielectric Healability and Recyclability

Sun

Luo

Zhang

et al. 2021

ACS Appl. Polym. Mater.

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Silicone-containing dynamically hindered urea bonds are developed as a smart insulating material for power equipment and electronic devices. In this work, silicones are constructed by isocyanate−piperazine-based dynamic bonds with cross-linking degree adjusted by glycerol. Healing and recycling based on dielectric and insulating properties are mainly emphasized in this study. We find that dynamic bonds not only heal the cut-damaged feature of the silicone but also enable dielectric property recovery. A healing efficiency above 95% and a recycling efficiency above 90% based on insulation performance are achieved. After recycling, cross-linked silicone exhibits only a slight variation in permittivity and tan δ, while linear silicone shows an apparent increase. Insulation performance of materials with different cross-linking agent concentrations is also investigated. A higher cross-linking degree was found to further improve insulation properties but reduces the recycling efficiency. Importantly, the developed silicones exhibit high intrinsic insulation properties, comparable to commercial silicone materials, which are very attractive for electrical applications.

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Recent advances in polyurea elastomers and their applications in blast protection: a review

Ding,

Wang,

Lin

et al. 2024

J Mater Sci

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The dynamic chain effect on healing performance and thermo-mechanical properties of a polyurethane network

Cited by 12 publications

References 61 publications

Dual Dynamic Cross-Linked Epoxy Vitrimers Used for Strong, Detachable, and Reworkable Adhesives

Dual Dynamic Cross-Linked Epoxy Vitrimers Used for Strong, Detachable, and Reworkable Adhesives

Insulating Silicones Based on Dynamic Hindered Urea Bonds with High Dielectric Healability and Recyclability

Recent advances in polyurea elastomers and their applications in blast protection: a review

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