Re-produced and moisture-sensitive covalent adaptable networks based on non-isocyanate polyurethanes

Polymer-based covalent adaptable networks (CANs) presented many unique mechanical and viscoelastic properties. Under external stimulation, CANs can be broken and reproduced which gives polymers dynamic properties such as re-shaping, re-processing, and self-healing. However, polymers-based CANs usually have insufficient mechanical properties and complex chemical compositions. Non-isocyanate polyurethane (NIPU) as a green and environmental-benign polymer can be a suitable candidate for the construction of dynamic cross-linking networks. In this paper, CANs was simply synthesized by using boronic ester unit and NIPU hydroxy-containing framework. Owning to its sensitive borate bond stimulated by both temperature and moisture, as-synthesized NIPU CANs exhibited excellent mechanical strength cyclic production, and moisture-sensitive adhesion property.