Polyurethane Foam with a Negative Poisson's Ratio for Diabetic Shoes
This study fabricated polyurethane foam after transforming the cell structure from a convex polyhedral shape to a concave shape. Polyurethane was synthesized and fabricated after changing the cellular structure of the foam using two methods. Scanning electron microscopy showed that the cellular structure was a more concave structure than in control foam. The Poisson’s ratio of the experimental foam was negative. The average range of the Poisson’s ratio was –3.4~0, versus 0.3~1.3 for the control foam.
Xingdong Zhang, Junzo Tanaka, Yaoting Yu and Yasuhiko Tabata
K.O. Park et al., "Polyurethane Foam with a Negative Poisson's Ratio for Diabetic Shoes", Key Engineering Materials, Vols. 288-289, pp. 677-0, 2005