Szymańska-Chargot Monika, Chylińska Monika, Pieczywek Piotr M, Walkiewicz Anna, Pertile Giorgia, Frąc Magdalena, Cieślak Krystian J, Zdunek Artur
Institute of Agrophysics PAS, Doswiadczalna 4, 20-290 Lublin, Poland.
Faculty of Environmental Engineering, Institute of Renewable Energy Engineering, Lublin University of Technology, Nadbystrzycka 40B, 20-618 Lublin, Poland.
Polymers (Basel). 2020 Apr 4;12(4):812. doi: 10.3390/polym12040812.
In this research, it was proposed to use carrot cellulose nanofibrils (CCNF) isolated from carrot pomace modified with silver nanoparticles (AgNPs) as a filler of polylactic acid (PLA) composites matrix. The new procedure was based on two steps: first, the preparation of nanocellulose modified with metal nanoparticles, and then the combination with PLA. Two concentrations-0.25 mM and 2 mM-of AgNO were used to modify CCNF. Then, PLA was mixed with the filler (CCNF/AgNPs) in two proportions 99:1 and 96:4. The influence of CCNF/AgNPs on mechanical, hydrophilic, thermal, and antibacterial properties of obtained nanocomposites was evaluated. The greatest improvement of mechanical properties was observed for composite containing CCNF with 2 mM of AgNPs, which obtained the lowest Young modulus and highest strain at break. The degradation temperature was lower for PLA with CCNF/AgNPs, but crystallization temperature wasn't influenced. The addition of CCNF/AgNPs also increased hydrophilicity. The transmission rates of oxygen, nitrogen, and carbon dioxide also increased after the addition of CCNF/AgNPs to PLA. The antibacterial function against and was obtained after the addition of AgNPs but only at the contact surface with the material made, suggesting the lack of migration of nanoparticles from the composite.
在本研究中，有人提议使用从胡萝卜渣中分离出的经银纳米颗粒（AgNPs）改性的胡萝卜纤维素纳米纤维（CCNF）作为聚乳酸（PLA）复合材料基体的填料。新方法基于两个步骤：首先，制备经金属纳米颗粒改性的纳米纤维素，然后与PLA结合。使用两种浓度（0.25 mM和2 mM）的AgNO₃来改性CCNF。然后，将PLA与填料（CCNF/AgNPs）按99:1和96:4两种比例混合。评估了CCNF/AgNPs对所得纳米复合材料的机械、亲水、热和抗菌性能的影响。对于含有2 mM AgNPs的CCNF复合材料，观察到其机械性能有最大程度的改善，该复合材料具有最低的杨氏模量和最高的断裂应变。含有CCNF/AgNPs的PLA的降解温度较低，但结晶温度不受影响。添加CCNF/AgNPs也增加了亲水性。向PLA中添加CCNF/AgNPs后，氧气、氮气和二氧化碳的透过率也增加了。添加AgNPs后获得了对[具体菌种1]和[具体菌种2]的抗菌功能，但仅在与制成材料的接触表面有抗菌效果，这表明纳米颗粒没有从复合材料中迁移出来。
