Design of inherent fire retarding and degradable bio-based epoxy vitrimer with excellent self-healing and mechanical reprocessability

Self-Healing and Flame-Retardant Modifications of Epoxy Resins by the Diels–Alder Release-Delivery Strategy for a High-Efficiency and Green Application

“…8−10 The evolution of the crack not only accelerates the breaking of the EP-based material but also causes a lot of resources and environmental pollution due to the irreparableness of the crack of thermoset resin. 11,12 Meanwhile, the fire caused by the burning of EP-based materials has also been threatening people's health and property safety. The flameretardant modification of EP-based materials by conventional halogen flame retardants releases inevitably a great amount of toxic corrosive gases, heat, and smoke, which not only reduces the survival possibility of disaster victims and firefighters in the fire but also brings serious pollution.…”

“…Due to their excellent chemical resistance, adhesion performance, thermal stability, dimensional stability, electrical insulation, and low density, epoxy thermosets (EPs) are regarded as suitable matrix materials for fabricating fiber-reinforced polymeric composites (FRPCs). − The corresponding composites are widely used in the fields of construction, automobile, and aerospace . Despite the potential and application of EP in the fabrication of FRPCs, the difficulty of repairing cracks and flammability still limit the sustainable development of EP-based FRPCs. − Although the highly cross-linked network existing in EP offers good stiffness and stability, the accompanying brittleness also increases the possibility of crack formation under the actions of various applied stresses (including the impact, shear, bend, and stretch). − The evolution of the crack not only accelerates the breaking of the EP-based material but also causes a lot of resources and environmental pollution due to the irreparableness of the crack of thermoset resin. , Meanwhile, the fire caused by the burning of EP-based materials has also been threatening people’s health and property safety. The flame-retardant modification of EP-based materials by conventional halogen flame retardants releases inevitably a great amount of toxic corrosive gases, heat, and smoke, which not only reduces the survival possibility of disaster victims and firefighters in the fire but also brings serious pollution. , Therefore, for promoting the high-efficiency, green, and sustainable development of EP-based materials, it is necessary and meaningful to seek a synergistic strategy to prolong the service life of EP while improving its flame retardancy in a green way.…”

Biobased Epoxy Resin with Inherently Deep-UV Photodegradability for a Positive Photoresist and Anticounterfeiting

“…Meanwhile, petroleum-based epoxy resins are facing serious environmental and sustainability problems due to their nonrenewability. Biobased epoxy resins originating from renewable resources, such as vegetable oils, , lignin, − vanillin, − furan, , are beneficial for establishing a stainable low-carbon society. Currently, many biobased epoxy resins are reported with excellent performance, for instance, higher glass transition temperature ,, and better mechanical properties ,, compared to commercial bisphenol A epoxy resin (DGEBA), and intrinsic flame retardancy. ,,, The outstanding performances of biobased epoxy resins make sure to replace DGEBA in the conventional applied fields.…”

“…Biobased epoxy resins originating from renewable resources, such as vegetable oils, , lignin, − vanillin, − furan, , are beneficial for establishing a stainable low-carbon society. Currently, many biobased epoxy resins are reported with excellent performance, for instance, higher glass transition temperature ,, and better mechanical properties ,, compared to commercial bisphenol A epoxy resin (DGEBA), and intrinsic flame retardancy. ,,, The outstanding performances of biobased epoxy resins make sure to replace DGEBA in the conventional applied fields. With the development of functional materials, the additional performance requirements for epoxy resins cannot be ignored to extend their applications. − …”

Seawater-Degradable and Antibacterial Epoxy Thermosets Employing Betaine Ester Linkages

“…This process is limited because of the often complex (and expensive) chemistries that are required to enable photodegradation. For chemical degradation, the disulfide bonds, Schiff base, and acetal and ester groups are the common targets of chemical degradation reactions, as they can be cleaved under specific conditions such as reductive, acidulous, or alkalescent solutions. − Because full degradation can be realized in chemical degradation, it is the most popular degradation method. − Besides aspects of sustainability, the need for antimicrobial polymer materials has greatly increased during recent years. − Current antimicrobial coatings are usually classified into two types: antibacterial agent-releasing type and contact-killing type. − A major drawback of the agent-release mechanism is that bactericidal activity ceases upon depletion of the bactericidal agent. For contact-killing coatings, bactericidal units (such as quaternary ammonium salts or phosphonium salts) are anchored on the surface of coatings.…”