摘要
It has long been a great challenge to prepare materials with integrated merits of high strength,high modulus,high toughness,and light weight for structural material applications(e.g.,aircrafts,automobiles).High strength representing a good resistance to deformation usually requires the material have a rigid/hard molecular structure,whereas high toughness representing a good resistance to fracture typically originates from a soft/flexible molecular structure.Therefore,the trade-off between the rigid and flexible components in a molecule usually leads to an intrinsic conflict between high strength and high toughness[1].It is more intuitively in the typical stressstrain curves,where the integrated area of a tensile curve can be calculated for the toughness.Apparently,the attainment of high toughness needs not only high strength but also high tensile strain.
