Molded body, method for producing the body and use thereof

A method for producing a molded body, said method comprising:

• providing a film comprising a thermoplastic plastic and having a film thickness D ranging from 1 μm to 1000 μm;
• irradiating the film with ionizing radiation, to produce an irradiated film having irradiated regions having a radiation dose;
• thermally reshaping the irradiated film into a molded body so that a correlation between the radiation dose and the irradiated region is not lost and generating at least one hollow structure, wherein a temperature of the thermal reshaping remains below the melting temperature for the thermoplastic plastic, wherein the at least one hollow structure comprises:
• an outside diameter d equal to at least double a value of the film thickness D,
• a height h equal to or less than double the value of the outside diameter d,
• a wall thickness b greater than 0.02 times the film thickness D and less than or equal to the film thickness D, and
• a local curvature radius r greater than 0.2 times and less than or equal to 5 times the wall thickness b;
• removing the irradiated regions, to create pores having a diameter δ from about 10 nm to about 10 μm in the molded body, and
• removing the molded body from a mold.