Functional and Environmental Friendly Polyimine Elastomer Based on the Dynamic Covalent Network for a Flexible Strain Sensor

Development of Fluorenyl‐Based Copolyimines with Adjustable Mechanical Properties, Recyclability and Friction Resistance

“…In addition, reversible imine bonds enable materials with repairability, chemical recyclability, and antibacterial property. [6] They can be used in a wide variety of applications, such as elastomer, [7] aerogel, [8] membrane, [9] adhesive, [10] covalent organic framework, [11] linear plastic, [12] and crosslinked plastic. [13] However, the sensitivity of imine bonds to temperature, humidity, and acidity [14] exacerbates the unfavorable tradeoff between dynamic behavior and mechanical properties, which greatly limits the application areas of dynamically covalently crosslinked polyimines.…”

“…[16] By doing so, Yang et al used polyetheramine as the soft segment and adipic acid dihydrazide as the hard segment to prepare polyimine elastomers with excellent mechanical properties. [7] Fluorene functional unit with bulky structures have garnered significant attention, and fluorene-based polyimide materials have been extensively investigated in various fields such as materials science, drug development, and biochemistry, due to their exceptional performance and processability. [17] Therefore, for the construction of dynamic polyimines, the introduction of fluorene groups would be a good choice owing to the following advantages: (i) Bulky substituents would improve the glass transition temperature (T g ) of fluorene-based polyimines and the resistance to degradation by hindering molecular rotations.…”