Exploiting the reversible covalent bonding of boronic acids for self-healing/recycling of main-chain polybenzoxazines

Abstract

In this work, a new strategy for the synthesis of self-healable/recyable polybenzoxazine networks under mild conditions, by exploiting dynamic B–O bond exchanges is presented. The process is based on mixing...

High‐Performance Vitrimeric Benzoxazines for Sustainable Advanced Materials: Design, Synthesis, and Applications

“…Again, the bond exchange mechanism determines whether the material is a vitrimer. Two vitrimers based on two types of poly(propylene/ethylene oxide) bisamine exhibit self-healing at 110 °C for 5 h and at 160 °C for 5 h, respectively, with effective [427] Figure 30. Synthesis and polymerization of OBZ-BDB.…”

Recyclable thermosets based on modified epoxy-amine network polymers

“…[47][48][49] Immersion of the epoxy-amine-dioxazaborocane D100, in a range of solvents including ethanol, DMSO, toluene, acetone, THF, distilled water and 1 M NaOH showed no material integrity loss with the expected excellent chemical resistance and insoluble properties of a 'traditional/epoxy-amine' thermoset, network polymer. The hydrolytic stability under aqueous conditions, can be attributed to the enhanced stability of boronic esters containing tetra-coordinate bonding via N-atom coordination, 50,51 such as that seen in the bicyclic dioxazaborocane structures described here. The solvent resistance can be clearly seen in Fig.…”

The first observation of 3,1-benzoxazine polymerization for developing high performance thermosets

“…[3][4][5][6][7][8][9][10] Smart functions such as damage healability in polybenzoxazine based on hydrogen bonds, phenoxy exchange, ketene chemistry, boric ester, disulfide bonds and other dynamic structures have also been reported by Yagci and Kiskan et al, Verge et al and us. [11][12][13][14][15][16] The excellent molecular design flexibility of polybenzoxazine provides outstanding property adjustment capability. Variation in functional groups and topological structures can be achieved conveniently to adapt for different emerging application requirements.…”

“…3–10 Smart functions such as damage healability in polybenzoxazine based on hydrogen bonds, phenoxy exchange, ketene chemistry, boric ester, disulfide bonds and other dynamic structures have also been reported by Yagci and Kiskan et al , Verge et al and us. 11–16…”