Multifunctional bionanocomposite films of poly(lactic acid), cellulose nanocrystals and silver nanoparticles
Multifunctional bionanocomposite films of poly(lactic acid), cellulose nanocrystals and silver nanoparticles
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DOI：
10.1016/j.carbpol.2011.09.066
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发表时间：
2012-01-15
影响因子：
11.2
通讯作者：
Kenny, J. M.
中科院分区：
文献类型：
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作者：
Fortunati, E.;Armentano, I.;Kenny, J. M.
通过在聚乳酸（PLA）基体中加入纤维素纳米晶体（CNC）和表面活性剂改性的银（Ag）纳米粒子，采用熔融挤出法制备纳米复合薄膜。多功能复合材料的形态，机械，热和抗菌响应方面进行了研究。纳米复合膜保持了PLA基体的透明性。热分析显示纳米复合材料中结晶度值增加，在具有最高拉伸杨氏模量的基于s-CNC的制剂中更明显。表面活性剂的存在有利于纤维素纳米晶在聚合物基体中的分散，成核效应显著增强。此外，对金黄色葡萄球菌和大肠杆菌细胞的抗菌活性被检测到的三元系统，这表明这些新型的纳米复合材料可以提供良好的前景，食品包装应用，需要随着时间的推移的抗菌效果恒定。(C)2011爱思唯尔有限公司保留所有权利。
Nanocomposite films were prepared by the addition of cellulose nanocrystals (CNCs) eventually surfactant modified (s-CNC) and silver (Ag) nanoparticles in the polylactic acid (PLA) matrix using melt extrusion followed by a film formation process. Multifunctional composite materials were investigated in terms of morphological, mechanical, thermal and antibacterial response. The nanocomposite films maintained the transparency properties of the PLA matrix. Thermal analysis showed increased values of crystallinity in the nanocomposites, more evident in the s-CNC based formulations that had the highest tensile Young modulus. The presence of surfactant favoured the dispersion of cellulose nanocrystals in the polymer matrix and the nucleation effect was remarkably enhanced. Moreover, an antibacterial activity against Staphylococcus aureus and Escherichia coli cells was detected for ternary systems, suggesting that these novel nanocomposites may offer good perspectives for food packaging applications which require an antibacterial effect constant over time. (C) 2011 Elsevier Ltd. All rights reserved.