Preparation and properties of a self-healing polyurea material based on the synergistic effect of acylsemicarbazide and urea bond
[Introduction]The preparation of materials possessing exceptional mechanical strength and self-healing ability at ambient temperature presents a formidable challenge.[Method]By incorporating acylsemicarbazide and urea bond groups into the hard segment of the polymer,a self-healing polyurea material was synthesized at room temperature using isophenylhydrazine(IPDH)and thiourea as chain extenders.The effect of hydrogen bond density on the chemical structure,thermal properties,mechanical properties,and self-healing performance of the polyurea material was studied.[Result]The polymer synthesized at a IPDH-to-thiourea molar ratio of 3:2 had good comprehensive mechanical properties:tensile strength 19.33 MPa,elongation at break 929.6%,and toughness 52.69 MJ/m3.The presence of diverse hydrogen bonds within the polymer confers exceptional self-healing ability upon the material.The fracture surface was nearly imperceptible after 5 hours of repair at ambient temperature,and the recovery rates of tensile strength and elongation at break exceeded 80%after 36 hours.[Conclusion]The material exhibits the ability to undergo self-healing under mild conditions,thereby demonstrating promising prospects for application in intelligent protective materials.
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