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The effect of Laponite (a synthetic clay) on the structure, thermal and watervapor barrier properties of nanocomposite gelatin films produced by castingwith 0, 4.5 and 15% w Lap/w gelatin, was studied. X-ray diffraction,differential scanning calorimetry, thermogravimetric analysis and Fouriertransform infrared spectroscopy measurements were reported. The X-raydiffraction patterns showed dual crystalline structure of the films withcollagen-type bundles of triple helices, intercalated inside clay platelets,increasing interlayer distances. Depending on the renaturation oftriple-helices and Laponite content, the glass transition temperaturessubstantially decreased. The amount of helices decreased with Lapconcentration, affecting the enthalpy of melting. The nanocomposite gelatinfilms showed improved thermal stability. Changes of water vapor permeabilitycould be related to the presence of larger free volume of the coils andintercalated structures, facilitating water transfer through the film.

Effect of Laponite on the structure, thermal stability and barrier properties of nanocomposite gelatin films