Tensile and impact behavior of polystyrene microcellular foams with bi-modal cell morphology:

摘要: Bi-modal PS foams with various volume fractions of large cells (fL), cell sizes and densities were prepared to investigate the effect structures on tensile impact behaviors. The results showed that for similar density, strength modulus decreased increase fL, unless size ones is smaller than 25 µm. Similarly, experimental increasing fL in range 25–32%. It indicated bi-modal structure could lead better properties uniform one, when morphology was proper (fL 25–32% 25 µm). SEM images impact-fractured surface further confirmed 32% more favorable absorption energy during fracture process.