Self-Healing and Recyclable Castor Oil-Based Epoxy Vitrimer Based on Dual Dynamic Bonds of Disulfide and Ester Bonds
Category
Topical Literature Review
Department
Material Science
Student Status
Graduate
Research Advisor
Dr. Ram Gupta
Document Type
Event
Location
Student Center Ballroom
Start Date
10-4-2025 2:00 PM
End Date
10-4-2025 4:00 PM
Description
To develop a more sustainable and environmentally friendly epoxy resin, castor oil (CO)-based epoxy vitrimers based on dynamic ester bonds and disulfide bonds were prepared through epoxy-carboxylic acid, epoxy-amine, and free-radical polymerization reactions using epoxidized methacrylated castor oil as the epoxy prepolymer, glycerol methacrylate as the reactive diluent, and itaconic acid (IA) and 4,4'- dithiodiphenylamine (AFD) as the curing agents. The curing kinetics, curing degree, mechanical properties, thermal stability, and recycling characteristics of the EMCO-GMA-IA-AFD epoxy vitrimers were investigated. When the molar ratio of IA to AFD was 5:5, the EMCO-GMA-IA-AFD5:5 vitrimer exhibited a balanced comprehensive performance with a storage modulus of 1715 MPa, a tensile strength of 16.8 MPa, and a Tg of 44.6C. Meanwhile, the dynamic ester bonds and disulfide bonds within the system endowed the EMCO-GMA-IA-AFD vitrimer with self-healing ability and recyclability; the activation energy of reversible exchange reactions reached 89.29 kJ/mol, and the self-healing efficiency reached 94.6%. In addition, the EMCO-GMA-IA-AFD vitrimer was chemically degradable. Overall, this work provides a promising and feasible route for the preparation of sustainable CO-based epoxy with superior comprehensive properties.
Self-Healing and Recyclable Castor Oil-Based Epoxy Vitrimer Based on Dual Dynamic Bonds of Disulfide and Ester Bonds
Student Center Ballroom
To develop a more sustainable and environmentally friendly epoxy resin, castor oil (CO)-based epoxy vitrimers based on dynamic ester bonds and disulfide bonds were prepared through epoxy-carboxylic acid, epoxy-amine, and free-radical polymerization reactions using epoxidized methacrylated castor oil as the epoxy prepolymer, glycerol methacrylate as the reactive diluent, and itaconic acid (IA) and 4,4'- dithiodiphenylamine (AFD) as the curing agents. The curing kinetics, curing degree, mechanical properties, thermal stability, and recycling characteristics of the EMCO-GMA-IA-AFD epoxy vitrimers were investigated. When the molar ratio of IA to AFD was 5:5, the EMCO-GMA-IA-AFD5:5 vitrimer exhibited a balanced comprehensive performance with a storage modulus of 1715 MPa, a tensile strength of 16.8 MPa, and a Tg of 44.6C. Meanwhile, the dynamic ester bonds and disulfide bonds within the system endowed the EMCO-GMA-IA-AFD vitrimer with self-healing ability and recyclability; the activation energy of reversible exchange reactions reached 89.29 kJ/mol, and the self-healing efficiency reached 94.6%. In addition, the EMCO-GMA-IA-AFD vitrimer was chemically degradable. Overall, this work provides a promising and feasible route for the preparation of sustainable CO-based epoxy with superior comprehensive properties.
