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首页> 外文期刊>Polymer bulletin >Development of antimicrobial PCLanoclay nanocomposite films with enhanced mechanical and water vapor barrier properties for packaging applications
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Development of antimicrobial PCLanoclay nanocomposite films with enhanced mechanical and water vapor barrier properties for packaging applications

机译：具有增强的机械和水蒸气阻隔性能的抗菌PCL /纳米粘土纳米复合薄膜的开发用于包装应用

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Biodegradable PCL-base d nanocomposites were successfully prepared by melt mixing of the poly(epsilon-caprolactone) with two organo-modified Algerian montmorillonites by the cation exchange reactions with two quaternary ammonium surfactants, namely hexadecyl trimethyl ammonium chloride (OMMT1) and hexadecyl pyridinium chloride (OMMT2), with the aim to elaborate antimicrobial PCLanoclay composite films with enhanced properties for food packaging applications. PCL-based nanocomposite films containing either OMMT1 or OMMT2 organoclays have displayed mainly intercalated structures as attested by X-ray diffraction patterns and transmission electron microscope images. Glass transition (T (g)) and melting (T (m)) temperatures of these materials, evaluated by differential scanning calorimetry analysis, were remained almost unchanged. In addition, their thermal stabilities, observed by thermogravimetric analysis, were slightly decreased as compared to the neat PCL matrix. The antibacterial performance of PCL/OMMT1 and PCL/OMMT2 composite films against Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative) was assessed by counting the number of bacteria in the sample. A significant decrease in the number of bacteria is noticed after the addition of 3 wt% of OMMT to the matrix, where a maximum of 94 % of growth inhibition can be reached. Furthermore, these PCL/OMMT nanocomposites have showed an interesting improvement in their several properties that are strategically studied in packaging applications. The Young modulus has increased by 36 and 22 % for (PCL/OMMT1) and (PCL/OMMT2), respectively. Also, the water vapor permeability has decreased by 56 % for (PCL/OMMT1) and 48 % for (PCL/OMMT2).
机译：通过将聚（ε-己内酯）与两种有机改性的阿尔及利亚蒙脱土通过与两种季铵表面活性剂即十六烷基三甲基氯化铵（OMMT1）和十六烷基吡啶鎓氯化物的阳离子交换反应熔融混合，成功制备了可生物降解的基于PCL的d纳米复合材料。 （OMMT2），目的是为食品包装应用精心制作具有增强性能的抗菌PCL /纳米粘土复合膜。含有OMMT1或OMMT2有机粘土的基于PCL的纳米复合膜已经显示出主要是插层结构，这是通过X射线衍射图和透射电子显微镜图像证明的。通过差示扫描量热分析评估的这些材料的玻璃化转变温度（T（g））和熔融温度（T（m））几乎保持不变。另外，与纯PCL基质相比，通过热重分析观察到的它们的热稳定性略有降低。通过计数样品中细菌的数量来评估PCL / OMMT1和PCL / OMMT2复合膜对金黄色葡萄球菌（革兰氏阳性）和大肠杆菌（革兰氏阴性）的抗菌性能。向基质中添加3 wt％的OMMT后，注意到细菌数量的显着减少，其中最大可达到94％的生长抑制。此外，这些PCL / OMMT纳米复合材料在包装应用中进行了战略性研究的几种性能方面已显示出有趣的改进。 （PCL / OMMT1）和（PCL / OMMT2）的杨氏模量分别增加了36％和22％。同样，（PCL / OMMT1）的水蒸气渗透率降低了56％，（PCL / OMMT2）的水蒸气渗透率降低了48％。

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