Abstract
Azomethine diols (AMDs) were synthesized by condensation between a terephthalic aldehyde, polyether diamine, and ethanol amine. The synthesized AMDs were employed to introduce azomethine groups into the backbones of polyurethane elastomers (PUEs). Different AMDs were designed to control the concentration and distribution of azomethine groups in PUEs. In this study, we explored the intrinsic self-healing of AMD-based PUEs by azomethine metathesis. Particularly, the effects of the concentration and distribution of the azomethine groups on the AMD-based PUEs were considered. Consequently, as the azomethine group concentration increased and the distribution became denser, the self-healing properties improved. With AMD3-40, the self-healing efficiency reached 86% at 130 °C after 30 min. This represents a 150% improvement over the control PUE. Additionally, as the AMD content increased, the mechanical properties improved. With AMD3-40, the tensile strength reached 50 MPa. Therefore, we concluded that the self-healing and mechanical properties of PUEs can potentially be tailored for applications by adjusting the concentration and design of AMD structure for PUEs.
Highlights
Polyurethane elastomer (PUE) is one of the most versatile industrial polymers
It is postulated that the azomethine groups in AMD3 based PUEs are denser than those in AMD2 based PUEs at the same concentrations of azomethine groups in PUEs
AMD3-30 showed gradual from samples before and afterinhealing, confirming the self-healing of the specimens
Summary
Polyurethane elastomer (PUE) is one of the most versatile industrial polymers. PUEs are synthesized via a polyaddition reaction between polyols, diisocyanates, and chain extenders.PUEs with various mechanical properties can be synthesized by combining different polyols and diisocyanates. Polyurethane elastomer (PUE) is one of the most versatile industrial polymers. PUEs are synthesized via a polyaddition reaction between polyols, diisocyanates, and chain extenders. PUEs with various mechanical properties can be synthesized by combining different polyols and diisocyanates. The soft domain of PUE consists of polyol, while its hard domain comprises isocyanate and chain extender. The polyol in the soft domain endows elastic properties, and the strong hydrogen bonds between the hard domains confer rigidity to the PUE. The soft domain and hard domain contents significantly affect the mechanical properties of PUE. PU has traditionally been widely used for foams for thermal insulation and shock-absorbance, coatings, adhesives, fibers, and elastomers [4,5,6,7]
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