Rapid self-healing, multiple recyclability and mechanically robust plant oil-based epoxy resins enabled by incorporating tri-dynamic covalent bonding

Abstract

Establishment of both mechanically robust yet facile healable and recyclable epoxy resin systems are highly desirable and still present significant challenges. Herein, by fully utilizing epoxidized vegetable oils and dithiol...

Monomers and Macromolecular Materials from Renewable Resources: State of the Art and Perspectives

“…Vitrimers are a class of resins that can change their topology via a dynamic bond exchange, resulting in their self-healing and reprocessable molding [ 97 ]. Vegetable oil-based epoxy vitrimers with triple exchange crosslinkers of carboxylate ester bonds, disulfide bonds, and dioxaborolane were prepared and exhibited self-healing and recyclability properties, enabled by the dioxaborolane metathesis reaction of boronic ester, which is activated at room temperature with moderate humidity [ 98 ].…”

Efficient Miniemulsion Polymerization of Plant Oil-Based Acrylate Monomer toward Waterborne Epoxy Resins

“…Further curing at 160 °C for 3h, the curing efficiency increased to 95.5%. Due to the high content of epoxy groups in the latex, the cured film forms a highly cross-linked chemical network, resulting in a very small amount of epoxy groups that cannot participate in the reaction . Esterification, etherification, condensation esterification, and hydrolysis are supposed to occur during curing (Figure c). − The curing process of the latex film was detected in situ by variable temperature infrared.…”

“…Currently, the depletion of traditional fossil resources, environmental concerns, and stricter environmental laws are encouraging the production of biobased monomers and polymers from renewable feedstocks. − In this regard, different kinds of natural resources such as plant oils, lignin, carbohydrates, , and proteins have been used in the synthesis of biobased polymer latexes. Due to its low cost, abundance, and inherent biodegradability, plant oil has become one of the most important platform chemicals in the chemical materials industry − and widely used in coatings, ,− adhesives, ,, epoxy resins, − composite materials, − and so forth. The polymers prepared from plant oils and their derivatives possess unique properties, ,,, such as long fatty acid chains endow the polymers with good flexibility, hydrolytic stability, hydrophobicity, and inherently low glass-transition temperature.…”

Biobased covalent adaptable networks: towards better sustainability of thermosets

“…Additionally, Wang et al fabricated a series of VO-based vitrimers with tri-DCBs (boronic ester, carboxylic ester, and S–S bond) via the “thiol–epoxy” click reaction between EVOs with different epoxy values and tricyclic dithiol-bearing boronic esters. 133 They studied the effect of epoxy value on the thermal properties, mechanical properties, and self-healing behaviors of epoxy vitrimers. The results showed that with the increase of the epoxy value from 2.71 to 5.05, the tensile strength and Young's modulus increased from 5.87 MPa to 43.19 MPa and 17.15 MPa to 374.59 MPa, respectively, the elongation-at-break gradually reduced from 59.5% to 24.9%, and the temperature needed for self-healing was milder.…”