TGA investigation and morphological properties study of nanocrystalline cellulose/ag‐nanoparticles nanocomposites for catalytic control of oxidative polymerization of aniline

Abstract

Polyaniline (PANI) and PANI/nanocrystalline cellulose (NCC)/silver nanoparticles (AgNPs) nanocomposites have been prepared via in situ oxidative polymerization of aniline in the presence of NCC and AgNPs in green mediate using sugar beet leaf extracts. A series of nanocomposites has been synthesized by varying the concentrations of AgNPs (0, 1, 4, and 8%) along with 2 wt% of NCC. The control on oxidative polymerization for aniline has been studied using fabricated nanocomposites as catalysts. Various analysis techniques, including UV-visible spectroscopy, X-ray diffraction, and transmission electron microscopy, were adopted to confirm the Nano-sized AgNPs. The characteristic peaks of PANI and its nanocomposites were observed in the Fourier transfer infrared spectra of the nanocomposites, indicating the incorporation of NCC and AgNPs in the nanocomposite structure. Using three mathematical models, namely, Horowitz-Metzger, Coats-Redfern, and Broido methods, thermal degradation and kinetic parameters of the composites have been calculated for each step of thermal degradation. POLYM. COMPOS., 40:E753-E764, 2019. SCHEME 2. Schematic representation for NCC/AgNPs and PANI/NCC/ AgNPs nanocomposites structure. FIG. 7. DTA curves of (a) 0%, (b) 4%, (c) 8% and (d) 10% PANI/NCC/ AgPNs E758 POLYMER COMPOSITES-2019

Physicomechanical, dynamic mechanical, and morphological properties of Polyurethane/NCC/AgNP nanocomposites and their application in removal of heavy metals from wastewater

“…Nanoparticle aggregation affects the PU/NCC/AgNP properties. This confirms the shape of the Surface plasmon resonance (SPR) band in the UV–visible spectrum . From Fig.…”

“…The broadness of the peaks indicate the small size of the AgNPs synthesized. The interplanar spacing ( d hkl ) values (2.349, 2.040, 1.437, 1.239, and 1.176 Å) were obtained from the XRD spectra of AgNPs , and they are in agreement with the standard silver values. On the other hand, the diffraction peaks of PU/NCC/AgNP nanocomposites exhibit four new peaks at 2 θ = 33.8°, 42.5°, 54.8°, and 85.5°, which confirms the successful complexation of NCC/AgNPs on the PU surface .…”

“…Preparation of NCC assembled onto AgNPs (NCC‐Ag) was carried as follows: NCC solution (100 mL, 2.0 wt%) was prepared by solubilizing NCC in 1.0 wt% of sugar beet leaf extract (pH = 3.8) under constant stirring for 1 h. A 20 mL volume of the AgNP solution was mixed with 5 mL of sugar beet leaf extract solution and stirred for 4 h. The mixture of NCC/Ag was quenched and washed three to four times by successive centrifugations with deionized water to remove completely the remaining Ag species and by‐products. Subsequently, the reaction systems were centrifuged to separate the Ag/NCC from the liquid .…”

A novel method for the preparation of conductive methyl cellulose-silver nanoparticles-polyaniline-nanocomposite

“…Finally the band at about 905 cm−1 is characteristic for CN aromatic bending. These bands confirm the formation of PANi [27,36].…”

“…These conductive materials can be used for coating non-conductive fabrics to impart conductive properties. Polyaniline grafted chitosan or cellulose copolymers were prepared by the chemical in situ polymerization of aniline while AgNPs were synthesized by chemical reduction method and incorporated into the polymer matrix or by in situ polymerization of aniline monomer containing silver nitrate [35][36][37][38]. Equation 1 shows the reaction between aniline and silver nitrate.…”