“…Hence, we introduce the time-temperature equivalence principle to illustrate why longer processing times are required compared to melt processing, which is described by WLF law, that is, deformation and relaxation response of viscoelastic polymers is deeply dependent relation between time and temperature. [33,34] Many properties, including the relaxation modulus, viscosity, diffusion rate, etc, is depending on macromolecular mobility. For polymers in a highelastic state with low pressure applied, the requirement of more processing time can overcome the viscoelasticity of the polymer particles and promote their fusion.…”