Casein films prepared by a modified wet‐spinning process were studied using microscopy and measurements of physico‐chemical and mechanical characteristics. The pH of the film‐forming solution was critical for film properties. The most effective films were formed with pH 9 film‐forming solutions. They had low solubility in water and highest tensile strength (4.5 MPa), highest percentage elongation at break (68.6%) and lowest water vapor permeability (3.9 10 ‐10 g.m ‐1 .s ‐1 .Pa ‐1 ) values. Scanning electron micrographs revealed that those films had a denser ultrastructure than the others.
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Frinault et al. (1997) studied this question.
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