The invention discloses a high strength and high
toughness self-repairing
thermoplastic polyurethane urea elastomer and a preparation method thereof. The self-repairing
thermoplastic polyurethane ureaelastomer is synthesized by
double chain extension of prepolymers generated from diisocyanate and polyether diols separately in the presence of 2,6-diaminopyridine and
cysteamine. A
pyridine ligand unit is introduced onto a main chain, and coordination bonds are formed between molecular chains through the coordination effect of
metal ions, thereby forming interchain reversible molecular healing;at the same time, the coordination bonds act as dynamic crosslinking points and achieve the effects of limiting molecular chain slip and improving mechanical properties; a
disulfide bond is introducedinto a macromolecular main chain through
double chain extension, and the self-healing ability is improved in an association manner through a reversible exchange reaction of the main chain. The
elastomer has the self-repairing efficiency being more than 85%, the tensile strength being not less than 8 MPa and the
toughness being not less than 40 MJ / m<3>. The
elastomer is capable of both improving mechanical properties and self-repairing performance, can maintain the integrity and functionality of materials against complex deformation, and has extremely high application value in the field of flexible
electronic equipment.