Porous polyurethane films having biomimetic ordered open pores: Indentation properties

The dramatically improved indentation hardness and modulus of ordered porous films prepared by directional crystallization were reported herein, which to the best of our knowledge, have not been reported. The directional crystallization process of porous materials seems to have the unique advantage of strengthening along the pore direction. This processing technique provides freedom in the design of porous materials, as the pore direction can be engineered in an arbitrary direction. Anisotropic structures in such materials can be engineered to any direction by simply changing the temperature gradient of the surrounding polymer solutions.

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