Tailoring the performance of boehmite nanoparticles reinforced carboxymethyl chitosan/cashew gum blend nanocomposites via green synthesis

Meera, K.; Ramesan, M. T.

doi:10.1016/j.polymer.2023.125706

Cited by 40 publications

(22 citation statements)

References 57 publications

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“…It is obvious from the figure that these well‐defined peaks get shifted to a high frequency with the addition of nanofiller and the rise in temperature confirms the decline in relaxation time for conduction. A decrease in relaxation time is an indication of fast‐moving carrier ions and improved segmental mobility, which proves the conductivity enhancement with nanofiller content and temperature 47 …”

Section: Resultsmentioning

confidence: 85%

“…The nature of the plot is observed to be exactly like that obtained at ambient temperature and a gradual increase in the dielectric constant with temperature is evident. It is apparent that the thermal activation of polar groups can readily adapt to an oscillating electric field, which eventually leads to the positive deviation of the dielectric constant with temperature 47 …”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the appearance of a low frequency spike corresponds to the formation of a double‐layer capacitor at the sample‐electrode interface. The bulk resistance is measured from the intercept of a semicircle at the real axis 47 . The obtained values of R b for all the films at room temperature are tabulated in Table 4.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, better dispersion of nanofiller and strong intermolecular interactions existing between the polar groups of the polymer chain and boehmite enhance interfacial adhesion. We cannot neglect that there is a decrease in TS beyond 7 wt% loading due to the poor interfacial interaction caused by the agglomerated nanoparticles beyond this level 47 . Elongation at break measures the stretching capacity of films and it is possible to observe an inverse relationship between EB and boehmite content.…”

Section: Resultsmentioning

confidence: 99%

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High performance biopolymer blend nanocomposites derived from cashew gum/polyvinyl alcohol/boehmite for flexible electronic devices

Meera

Arun

Ramesan

2023

J of Applied Polymer Sci

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This work reports on a bio‐based polymer blend comprised of polyvinyl alcohol/cashew gum (PVA/CG) embedded with boehmite nanoparticles to tailor the structural, thermal, mechanical properties, and electrical response. The chemical bonding between boehmite and the PVA/CG blend was confirmed by FTIR. The XRD data showed that the nanocomposite films had distinct peaks of boehmite. The SEM images revealed uniformly dispersed morphology at 5 wt% boehmite. The elemental composition of blend nanocomposites was revealed by the EDX analysis. The thermal stability of the blend increases with increasing boehmite, whereas the glass transition temperature decreases. The highest AC conductivity was achieved for PVA/CG/7 wt% boehmite, which was 4.6 times greater than the pure blend. The frequency and temperature‐dependent dielectric constant, modulus and impedance of all films were examined in conjunction with different nanoparticle loadings. Tensile strength and hardness have improved with the addition of boehmite into the PVA/CG blend whereas the elongation at break slightly decreases. The PVA/CG blend had a tensile strength of 31.17 MPa, which increased to 44.66 MPa when 7 wt% boehmite was added. Therefore, eco‐friendly PVA/CG/boehmite films with good thermal stability, mechanical strength, dielectric constant, and conductivity could be a practical green substitute for flexible electronic, charge storage, and electrochemical devices.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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High performance biopolymer blend nanocomposites derived from cashew gum/polyvinyl alcohol/boehmite for flexible electronic devices

Meera

Arun

Ramesan

2023

J of Applied Polymer Sci

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“…[16] The in-situ polymerization technique is the most effective among these different methods for preventing the agglomeration of fillers in the polymer matrix. [17][18][19] The main goal of this work is to evaluate the reinforcing ability of different contents of AR powders in a PVAc matrix through in-situ polymerization of vinyl acetate monomers inside the shatavari to give molecular polymer composites. This polar polymer has been chosen as a matrix because of the above specified advantages and the expected interaction of its ester groups with the hydrophilic surfaces of the AR, leading to strong hydrogen bonding.…”

Section: Introductionmentioning

confidence: 99%

In situ emulsion polymerization of poly (vinyl acetate) and asparagus racemosus biopolymer composites for flexible energy storage applications

et al. 2023

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Polymer composites reinforced with synthetic materials are losing acceptability due to significant environmental concerns and high costs. Natural fillers are becoming increasingly popular due to their non‐toxicity, lightweight, low energy consumption, and environmental friendliness. In the present work, poly (vinyl acetate) (PVAc) and asparagus racemosus (AR) bio‐composites have been prepared by an in‐situ emulsion polymerization method. The composite films were subsequently examined by Fourier transform infrared spectroscopy (FT‐IR), X‐ray diffraction, atomic force microscopy (AFM), field emission scanning electron microscopy (FE‐SEM), optical microscope, differential scanning calorimeter (DSC), and thermogravimetric analysis. The formation of AR in PVAc composite was confirmed by the characteristic AR band at 3300 cm−1 in FT‐IR spectra. X‐ray diffraction studies showed a shift in the amorphous peak of PVAc/AR composites compared to pure PVAc. The AFM, FE‐SEM, and optical microscopic results revealed the uniform distribution of AR in the polymer matrix. DSC and TGA measurements showed that the glass transition temperature and thermal stability of PVAc increased with the inclusion of bio‐filler. The tensile strength, hardness, dielectric constant and AC conductivity of PVAc were observed to increases with boehmite inclusion, whereas elongation at break is reduced. As a result, environmentally friendly PVAc/AR composites with good mechanical, thermal and electrical properties could be a viable green substitute for energy storage, flexible electronic, and other electrochemical devices.

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Green‐Synthesized Zinc Oxide/Polyvinyl Alcohol /Cashew Gum/Polypyrrole Nanocomposites With Enhanced Mechanical, Thermal, and Electrical Properties for Nanoelectronics

Kalladi,

Ramesan

2025

J of Applied Polymer Sci

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In this study, ternary blend nanocomposites were synthesized through a green in situ polymerization process, utilizing zinc oxide (ZnO) nanofillers into a polyvinyl alcohol/cashew gum/polypyrrole (PVA/CG/PPy) matrix. The optical, morphological, structural, thermal, mechanical, and electrical properties of these nanocomposites were comprehensively analyzed using UV–visible spectroscopy, FTIR, XRD, FE‐SEM, TGA, and DSC. The findings revealed strong interactions between PVA, CG, PPy, and ZnO, with the uniform growth of spherical ZnO nanoparticles within the blend. Increasing ZnO content led to a reduction in optical bandgap energy, reaching 3.375 eV at its minimum. XRD revealed an intensified ZnO signal in the nanocomposites with higher ZnO concentrations. Thermal stability (TGA) and glass transition temperature (DSC) improved with increasing ZnO content, signifying strong interfacial adhesion between ZnO and the PVA/CG/PPy blend matrix. The nanocomposites also exhibited enhanced AC electrical conductivity and dielectric properties compared to the pristine blend. Notably, the dielectric constant, dielectric loss, and impedance decreased with rising temperature. Mechanical properties improved with a 39.6% increase in tensile strength at 3 wt% ZnO loading. ZnO was identified as an optimal nanofiller at 3 wt%, enhancing mechanical, thermal, and electrical properties, making these nanocomposites promising candidates for eco‐friendly, robust, and efficient nanoelectronic devices.

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Tailoring the performance of boehmite nanoparticles reinforced carboxymethyl chitosan/cashew gum blend nanocomposites via green synthesis

Cited by 40 publications

References 57 publications

High performance biopolymer blend nanocomposites derived from cashew gum/polyvinyl alcohol/boehmite for flexible electronic devices

High performance biopolymer blend nanocomposites derived from cashew gum/polyvinyl alcohol/boehmite for flexible electronic devices

In situ emulsion polymerization of poly (vinyl acetate) and asparagus racemosus biopolymer composites for flexible energy storage applications

Green‐Synthesized Zinc Oxide/Polyvinyl Alcohol /Cashew Gum/Polypyrrole Nanocomposites With Enhanced Mechanical, Thermal, and Electrical Properties for Nanoelectronics

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