Fabrication and characterization of biopolymer nanocomposites from natural resource materials

Abstract

In this study, nanocomposites of cashew tree gum (CTG) encapsulated nano-magnetite (Fe 3 O 4 ) was prepared and characterized by FTIR, UV-visible, X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), magnetic and conductivity measurements. The characteristic absorption peaks in FTIR and UV-vis spectra of CTG was found to be shifted to higher wave numbers in CTG/Fe 3 O 4 composite, which is due to the intermolecular interaction between nanoparticles and the CTG. The XRD patterns indicated that amorphous region of gum was decreased by the addition of metal oxide nanoparticles. SEM images show that nano-Fe 3 O 4 was uniformly dispersed in the cashew gum segments. DSC analysis revealed that the glass transition temperature and melting behavior of composites were higher than those of the pure gum. TGA results indicated that the thermal decomposition temperature of the composite increases with the increase in concentration of metal oxide nanoparticles. The magnetic properties studied by a vibrating sample magnetometer indicate that electromagnetism of CTG/Fe 3 O 4 nanocomposites were superparamagnetic. The values of saturation of magnetization (M s ) and remanence (M r ) increases, while the coercivity (Hc) decreased with increase in Fe 3 O 4 content in the composite. The AC electrical conductivity of the nanocomposites was significantly increased with the increase in Fe 3 O 4 content in the nanocomposite. Due to the ordered structure of polymer composite, the dielectric constant and dielectric loss tangent (tan d) of nanocomposites were also increased with increase in the concentration of nanoparticles. POLYM.

Exopolysaccharide Produced by Probiotic Strain Lactobacillus paraplantarum BGCG11 Reduces Inflammatory Hyperalgesia in Rats

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Evaluation of spectral, thermal, flame retardant, dielectric, solvent diffusion, and transport behavior of novel nanocomposite derived from chlorinated styrene butadiene rubber and manganous tungstate

“…In fact, polymers filled with inorganic particles show excellent electrical and thermal properties. Compared to conventional polymer composite containing microsized inorganic particles as fillers, the incorporation of even lower weight percent of nanoparticles (<15 phr) has tremendous improvement in properties . The advantages of polymer nanocomposites are its high strength, low cost, lightweight, elasticity, toughness, and easy processability to a desired and useful shape using different fabrication methods .…”

Nanocomposite materials based on zinc sulfide nanoparticles reinforced chlorinated styrene butadiene rubber

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“…The lower conductivity of the nanocomposite at higher concentration of nanoparticles (above 7 phr) is due to the agglomeration of nanoparticles in chlorinated SBR. 38 Dielectric Loss Tangent (Tan d). Dielectric loss is the amount of energy dissipated through the rotation or movement of molecules by the application of an external electric field.…”