Functionalization of amine-cured epoxy resins by boronic acids based on dynamic dioxazaborocane formation

Abstract

Functionalization of epoxy resins after curing was performed based on dynamic dioxazaborocane formation between intrinsic diethanolamine units in amine-cured epoxy resins and boronic acid modifiers.

Recyclable thermosets based on modified epoxy-amine network polymers

“…Similar trends were observed for the ultimate tensile strength data of D R 100 (Fig. 11a) with the preand post-recycling results for D80/D R 80 and D100/D R 100 statistically indistinguishable from each other (30)(31)(32)(33)(34)(35)(36)(37)(38). Again, whilst the A 3 control demonstrated higher strength (68-69 MPa), the results for the epoxy-amine-dioxazaborocane were very promising.…”

“…5a and b, non-smooth decline in E 0 and E 00 ). Given the wellestablished exchange reaction of boronic esters with diols and amino-diols 18,38,41 it is proposed that these transitions are related to rapid bond exchange reactions and related rapid topological rearrangements, between 'occupied' (dioxazaborocane) and 'unoccupied' (b-amino diol) groups, enabled by the transition of the materials from the glassy to rubbery material state. It has been suggested that, when the topological freezing temperatures (T v ) is significantly lower than T g , facile topological rearrangements would be expected at T 4 T g .…”

N-Coordinated Organoboron in Polymer Synthesis and Material Science

“…Very recently, a postpolymerization modification method was developed to achieve the modification and functionalization of epoxy resins by the reaction between a diethanolamine (DEA) unit and boronic acid (Figure a). , The linear epoxy polymer (EP) with a DEA unit was first synthesized from the ring-opening polycondensation between diglycidyl ether of bisphenol A (DGEBA) and aliphatic propylamine. Subsequently, the EP precursor was treated with various boronic acids, such as 4-methylphenyl boronic acid and anthracene boronic acid.…”

Surface Modification of (Non)‐Fluorinated Vitrimers through Dynamic Transamination

“…In this context, the implementation of functional reactive crosslinks that are able to (re)form and dissociate or rearrange reversibly to overcome the inherent non‐recyclability of covalently cross‐linked polymer networks is an interesting strategy. This concept, commonly referred to as covalent adaptable networks (CANs), [ 3 ] has been explored for a number of different cross‐linked materials and considered for broad applications ranging from polymer processing, [ 4 ] creation of composites, [ 5 ] welding, [ 6 ] or adhering [ 4a,7 ] to structuration, [ 8 ] enabling significant technological advancements that address societal interests in sustainable materials. Vitrimers, pioneered by Leibler and co‐workers in 2011, are a unique and promising class among these CANs.…”