دانلود رایگان مقاله سلولز نانوفیبردار - پلیوینیلپیرولیدون - نانوذرات نقره فیلم با خواص هدایت الکتریکی

ABSTRACT

Nanofibrillated cellulose (NFC) isolated from rice straw pulp was used with polyvinylpyrrolidone (PVP) and silver nanoparticles (AgNPs) to prepare nanocomposites in the form of flexible films. The later films have promising mechanical and electrical conductivity properties. The isolated cellulose nanofibers were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Silver nanoparticles prepared via in-situ reduction in PVP were characterized using TEM and UV–vis spectroscopy. Tensile properties, microscopic structure, and electrical properties of nanocomposites films were studied. TEM and UV–vis spectroscopy proved the in-situ formation of AgNPs in PVP matrix. Films with good flexibility and tensile strength properties could be obtained from NFC/PVP/AgNPs as revealed from the (SEM) images and tensile properties testing. The electrical conductivity of NFC/PVP/AgNPs supports this system to be an excellent choice for sensitive electronic components packing as it can be used as antistatic and electrostatic dissipative materials.

4. Conclusions

Flexible films from nanofibrillated cellulose (NFC) and polyvinylpyrrolidone (PVP) in absences and presence of silver nanoparticles (AgNPs) were prepared. Mechanical properties, microscopic structure and electrical properties of nanocomposites films were investigated using tensile testing, scanning electron microscopy (SEM), and high-resolution broad band impedance analyzer, respectively. The loaded nanocomposites with AgNPs showed promising electrical conductivity for various applications. The prepared films may be used as antistatic and static dissipative materials. The prepared nanocomposites films showed good homogeneity and acceptable tensile strength properties. Among different concentrations of the investigated nanocomopsites, NFC/PVP/AgNPs 25/75/2 showed the highest electrical conductivity. The electrical conductivity of NFC/PVP/AgNPs nanocomposites was within the range of (2.36 × 10−10 S/cm–1.5 × 10−6 S/cm) at 30 ◦C. This supports the prepared nanocomposites films to be an excellent choice for sensitive electronic packing components.