3. Solid foams
By definition, a foam is a dispersion of gas in a liquid. When the liquid congeals and the gas bubbles cannot escape, the result is a solid foam.
Solid polymeric foams can be prepared in two ways: by physical foaming (requiring a blowing agent) or by chemical foaming (gas released during polymerization reactions, usually starting with water and/or carbon dioxide). Polyurethane foams can thus be prepared by either method, depending on the desired final characteristics
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Solid foams
Gels
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Bibliography
- (1) - SING (K.S.W.), EVERETT (D.H.), HAUL (R.A.W.), MOSCOU (L.), PIEROTTI (R.A.), ROUQUEROL (J.), SIEMIENIEWSKA (T.) - Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendation 1984). - Pure Appl. Chem., 57(4), p. 603-619 (1985).
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