Abstract
Blowing is the liberation of gas which may create pores. Pores can only be obtained if the structure of the product wherein the gas is developed is strong enough to keep at least a part of the gas inside. To obtain porous products the gas creates pores in the blowing process. The gas is mostly liberated in the polymer during solidification to a film, coating or impregnation. Gas can be generated by adding a blowing agent like azoisobutyric acid dinitrile or azodicarbonamide (see Chap. 2.1) to the polymer(solution) prior to the solidifying step. By raising the temperature, the blowing agent liberates nitrogen gas [3]. Another product that liberates gas by raising the temperature is ammonium bicarbonate, which liberates carbon dioxide [8].
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Träubel, H. (1999). Blowing and Foaming. In: New Materials Permeable to Water Vapor. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-59978-1_11
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