基于瓜尔胶的纳米复合薄膜的力学和阻隔性能。
Mechanical and barrier properties of guar gum based nano-composite films.
机构信息
Food Technology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
出版信息
Carbohydr Polym. 2015 Jun 25;124:77-84. doi: 10.1016/j.carbpol.2015.02.004. Epub 2015 Feb 12.
Guar gum based nano-composite films were prepared using organically modified (cloisite 20A) and unmodified (nanofil 116) nanoclays. Effect of nanoclay incorporation on mechanical strength, water vapor barrier property, chromatic characteristics and opacity of films was evaluated. Nano-composites were characterized using X-ray scattering, FTIR and scanning electron microscopy. A nanoclay concentration dependent increase in mechanical strength and reduction in water vapor transmission rate was observed. Films containing nanofil 116 (2.5% w/w guar gum) and closite 20A (10% w/w guar gum) demonstrated a 102% and 41% higher tensile strength, respectively, as compared to the control. Lower tensile strength of cloisite 20A films as compared to nanofil 116 films was due to its incompatibility with guar gum. X-ray scattering analysis revealed that interstitial spacing between nanofil 116 and cloisite 20A sheets increased due to intercalation by guar gum polymer. This resulted in improved mechanical and barrier properties of nano-composites compared to control.
采用有机改性（Cloisite 20A）和未改性（Nanofil 116）纳米黏土制备了瓜尔胶基纳米复合材料薄膜。评估了纳米黏土的加入对薄膜的机械强度、水蒸气阻隔性能、色度特性和不透明度的影响。使用 X 射线散射、FTIR 和扫描电子显微镜对纳米复合材料进行了表征。观察到纳米黏土浓度依赖性地增加了机械强度和降低了水蒸气透过率。与对照相比，含有 Nanofil 116（2.5%w/w 瓜尔胶）和 Cloisite 20A（10%w/w 瓜尔胶）的薄膜分别表现出 102%和 41%更高的拉伸强度。与 Nanofil 116 薄膜相比，Cloisite 20A 薄膜的拉伸强度较低，这是由于其与瓜尔胶的不兼容性所致。X 射线散射分析表明，由于瓜尔胶聚合物的插层作用，Nanofil 116 和 Cloisite 20A 片层之间的层间间距增加。这导致纳米复合材料的机械和阻隔性能得到改善，优于对照。
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