Laponite对纳米复合明胶膜结构、热稳定性及阻隔性能的影响
Effect of Laponite on the structure, thermal stability and barrier properties of nanocomposite gelatin films
摘要：
研究了Laponite（一种合成粘土）对纳米复合明胶膜的结构、热阻隔性和水蒸气阻隔性的影响，所述纳米复合明胶膜通过用0、4.5和15%w Lap/w明胶浇铸而产生。报道了X射线衍射、差示扫描量热、热重分析和傅里叶变换红外光谱的测量结果。X-射线衍射图显示了具有胶原型三螺旋束的膜的双晶结构，插入粘土血小板内，增加层间距离。根据三螺旋的复性和Laponite含量，玻璃化转变温度大幅下降。螺旋的量随着Lap浓度的增加而减少，从而影响熔化焓。纳米复合明胶膜显示出改善的热稳定性。水蒸气渗透性的变化可能与存在较大的自由体积的线圈和插入结构，促进水通过膜的传输。
英文摘要：
The effect of Laponite (a synthetic clay) on the structure, thermal and water vapor barrier properties of nanocomposite gelatin films produced by casting with 0, 4.5 and 15% w Lap/w gelatin, was studied. X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis and Fourier transform infrared spectroscopy measurements were reported. The X-ray diffraction patterns showed dual crystalline structure of the films with collagen-type bundles of triple helices, intercalated inside clay platelets, increasing interlayer distances. Depending on the renaturation of triple-helices and Laponite content, the glass transition temperatures substantially decreased. The amount of helices decreased with Lap concentration, affecting the enthalpy of melting. The nanocomposite gelatin films showed improved thermal stability. Changes of water vapor permeability could be related to the presence of larger free volume of the coils and intercalated structures, facilitating water transfer through the film.
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