Development of long-term antimicrobial poly (ε-caprolactone)/silver exchanged montmorillonite nanocomposite films with silver ion release property for active packaging use
Development of long-term antimicrobial poly (ε-caprolactone)/silver exchanged montmorillonite nanocomposite films with silver ion release property for active packaging use
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DOI：
10.1007/s00289-015-1543-9
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发表时间：
2016-05-01
期刊：
影响因子：
3.2
通讯作者：
Habi, Abderrahmane
中科院分区：
文献类型：
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作者：
Benhacine, Faycal;Hadj-Hamou, Assia Siham;Habi, Abderrahmane
采用溶剂浇铸法制备了聚己内酯/银交换蒙脱土（PCL/Ag-MMT）纳米复合材料，该复合材料具有较强的抗菌活性和缓释性能，可用于活性包装。通过多种技术表征了含有不同Ag-MMT负载量的PCL/Ag-MMT纳米复合材料。X射线衍射（XRD）、紫外-可见光谱（UV-vis）和透射电子显微镜（TEM）分析结果表明，蒙脱土片层发生剥离，球形Ag纳米粒子随机分布在聚合物基体中。差示扫描量热法（DSC）表明，PCL/Ag-MMT纳米复合材料的玻璃化转变温度和熔融温度不受粘土含量相比，纯PCL。然而，由于有效的成核剂Ag-MMT的引入及其在PCL基体中的良好分散，结晶温度提高。通过水渗透率（WVP）的降低证实了Ag-MMT对PCL阻隔性能的积极影响。拉伸结果也显示了由于粘土颗粒插入到PCL基体中，PCL/Ag-MMT纳米复合材料的力学性能的改善。用原子吸收光谱法测定了PCL/Ag-MMT膜在微酸性水介质中释放银离子的电位。结果显示，浸泡30天后释放的银离子量逐渐增加。离子释放的动力学研究表明，离子的释放机制是由扩散过程。使用扩散模型计算的表观扩散系数值在3.8 x 10（-10）至5.8 x 10（-10）cm（2）/s的范围内。PCL/Ag-MMT薄膜对S.金黄色葡萄球菌、E.大肠杆菌、沙门氏菌和铜绿假单胞菌，这是由于存在长效杀生物银纳米颗粒。
Poly (epsilon-caprolactone)/silver exchanged montmorillonite (PCL/Ag-MMT) nanocomposites with a strong antibacterial activity and a slow release property were successfully prepared via solvent casting method, for active packaging use. The PCL/Ag-MMT nanocomposites containing different Ag-MMT loadings were characterized by several techniques. X-Ray Diffraction (XRD), UV-visible Spectroscopy and Transmission Electron Microscopy (TEM) results revealed that the MMT layers were exfoliated and spherical Ag nanoparticles were randomly distributed in the polymer matrix. Differential scanning calorimetry (DSC) showed that glass transition and melting temperatures of PCL/Ag-MMT nanocomposites were unaffected by clay contents compared to neat PCL. Nevertheless, the crystallization temperatures were increased due to the incorporation of effective nucleation agent Ag-MMT and its satisfactory dispersion into the PCL matrix. The positive effect of the Ag-MMT addition on the PCL barrier properties was confirmed by the reduction in the water permeability (WVP). Tensile results also displayed an improvement of mechanical properties for the PCL/Ag-MMT nanocomposites due to the insertion of clay particles into the PCL matrix. The potential of the silver ion release from the PCL/Ag-MMT films to a slightly acidified water medium was measured by atomic absorption spectroscopy. The results exhibited a gradual increase of the amount of silver ions released up to 30 days of immersion. The kinetic study of the ions release showed that the release's mechanism is governed by the diffusion process. The apparent diffusivity coefficient values calculated using the diffusion model were in the range of 3.8 x 10(-10) to 5.8 x 10(-10) cm(2)/s. Furthermore, the PCL/Ag-MMT films exhibited a strong antibacterial efficiency against S. aureus, E. coli, salmonella and P. aeruginosa due to the presence of the long-lasting biocidal silver nanoparticles.