Effect of the Crosslinking Degree on Self‐Healing Poly(1,2,3‐Triazolium) Adhesive

Abstract

Dynamic covalent materials are a class of polymer that could be stress-relaxation, reprocessable, and self-healing due to dynamic crosslinks in network. Dynamic crosslinks play an important role in the typical characteristic of self-healing polymers. It is meaningful to understand the effect of crosslinking degree on the properties of poly(1,2,3-triazolium) (PTAM). In this article, the dynamic covalent network of PTAM adhesive has been used to study the effect of crosslinking degree. A series of PTAM adhesive with different crosslinking degrees have been obtained by changing the amount of crosslinker. Adhesion property can first rise then fall down with the increase of crosslinking degree and the best lap-shear strength is above 20 MPa. Creep resistance and solvent resistance can be enhanced with the increase of crosslinking degree. Self-healing studies have shown that crosslinking degree can enhance the ability of self-healing, but too high crosslinking degree raises the temperature of self-healing and causes side reaction which reduces the self-healing efficiency. These results provide some insights for the influence of the crosslinking degree on the self-healing and the structural design of dynamic covalent materials.

Preparation and characterization of reprocessable poly(1,2,3‐triazolium)

“…This observation confirms the formation of a crosslinked network within PTAM through 1,2,3‐triazolium. Only a minor fraction of PTAM (5.89%) dissolved in DMF, presumably due to the presence of uncrosslinked structures or oligomers 38 . According to the results of DSC, FTIR, XPS, and swelling test, it was demonstrated that PTAM with dynamic reversible crosslinked 1,2,3‐triazolium was obtained successfully.…”

“…1,2,3‐triazolium is synthesized via an N ‐alkylation reaction between 1,2,3‐triazole and an alkylating agent. According to the influence of content and structure of 1,2,3‐triazolium on the properties of PTAM, 38,39 DBH was selected as alkylating agent and the content of DBH was set to 25 mol% of BPEOB for the preparation of reprocessable PTAM.…”

“…The reshaping and recycling of PTAM was demonstrated based on the dynamic exchange reaction of 1,2,3‐triazoliums 31,32 . And in our previous studies, a series of self‐healing PTAM adhesives have been developed 37–39 . In this paper, we have developed a reprocessable PTAM, building upon previous studies, and conducted a thorough investigation of its reprocessing capabilities.…”

“…31,32 And in our previous studies, a series of self-healing PTAM adhesives have been developed. [37][38][39] In this paper, we have developed a reprocessable PTAM, building upon previous studies, and conducted a thorough investigation of its reprocessing capabilities. The findings presented here serve as a valuable reference for the functional development of PTAM and other related materials.…”

Fully recyclable high-performance polyacylsemicarbazide/carbon fiber composites

“…The stability of the internal crosslinking network of the polymer has a very important impact on the service life and dimensional stability of the material. 8,39 Therefore, to further characterize the stability of the internal crosslinking network of PASC materials, we characterized the room temperature stability of PASC-IPDI-IPDH-3 in conventional solvents. As shown in Fig.…”