A combined experimental and computational study of flexible polyvinyl alcohol (PVA)/graphene oxide (GO) nanocomposite films for superior UV shielding with improved mechanical properties

Mruthyunjayappa, Kavitha Cheelangi; Paramashivaiah, Shashidhar Anivala; Mallikarjunappa, Eshwarappa Kunabevu; Padre, Shilpa Molakkalu; Gurumurthy, S. C.; Surabhi, Srivathsava; Jeong, Jong‐Ryul; Montecinos, Daniela. Valentina Morales; Murari, M.S.

doi:10.1016/j.mtcomm.2023.105662

Cited by 6 publications

(4 citation statements)

References 49 publications

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“…Another weak vibration band, appearing as a shoulder at 1250.87 cm −1 , corresponds to O-H bending vibrations, and the absorption band at 1094.05 cm −1 is attributed to C-O stretching of the acetyl groups present in the PVA backbone. The identification of these characteristic groups in PVA aligns with previous studies cited in the literature [49,50,51,52,53].…”

Section: Bi-layer and Quadri-layer Spin-lbl Pva-mmt Filmssupporting

confidence: 89%

Development of multilayer PVA-MMT and PVA-CS film structures by spin coating-assisted layer-by-layer technique: Effect of PVA, CS and MMT nanoclay orientation on oxygen barrier properties

Mighri

2023

Mater. Plus

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The orientation of biopolymer macromolecules and nanoclay, specifically Montmorillonite (MMT) nanoplatelets, plays a crucial role in controlling the properties of multi-layer film structures. Understanding the impact of macromolecule and nanoclay platelets’ orientation on barrier properties of packaging films is essential. To investigate the influence of hydrogen bonding in multilayer films structures, two polymers, namely polyvinyl alcohol (PVA) and chitosan (CS), were selected and laminated nanocomposite films were fabricated using the spin coating-assisted layer-by-layer (Spin-LbL) assembly technique. This technique facilitates the production of highly oriented nanocomposite films, where polymer chains and nanoclay particles align parallel to the film surface. Multi-directional 2-D wide-angle X-ray diffraction (2D-WADX) was successfully used to accurately assess the orientation and distribution of MMT nanoplatelets. Additionally, the films underwent characterization using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The 2D-WADX analysis revealed a parallel alignment of both the PVA chains and MMT clay nanoplatelets parallel to film surface. The XRD results confirmed the formation of intercalated nanolaminate structures, hydrogen-bonding interactions, and adjustments in the crystalline structure of PVA matrix. Through contact angle and oxygen permeability measurements, we observed that all quadri-layer film structures exhibited hydrophobic properties and reduced oxygen permeability compared to neat PVA films. Furthermore, the integration of MMT nanoclay, even at low concentrations, contributed to the development of nanocomposite films with improved oxygen barrier properties. Consequently, the quadri-layer films demonstrate great potential for food packaging applications.

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Section: Bi-layer and Quadri-layer Spin-lbl Pva-mmt Filmssupporting

confidence: 89%

Development of multilayer PVA-MMT and PVA-CS film structures by spin coating-assisted layer-by-layer technique: Effect of PVA, CS and MMT nanoclay orientation on oxygen barrier properties

Mighri

2023

Mater. Plus

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“…This value represents a moderate level of cross‐linking. Our earlier work 2,31 has extensively covered the analysis of functional groups in PVA and PVA/GO‐Ag/GA.…”

Section: Results and Analysismentioning

confidence: 99%

“…Polymer nanocomposites (NCs), which integrate a polymer matrix with various nanomaterials, demonstrate exceptional optical, electrical, thermal, and mechanical characteristics, making them essential as insulating material in power equipment function as dielectrics, providing mechanical support and high‐voltage insulation, UV shielding, and electronic components such as power tool handles, cables, capacitors, packaging materials, industrial radiology, and nuclear waste handling 1–6 . Undergoing radiation, especially harsh electromagnetic radiation, neutrons, and rapid heavy ions, can induce changes in polymers.…”

Section: Introductionmentioning

confidence: 99%

Hybrid polymer nanocomposites with tailored band gaps and UV absorption for advanced applications in optoelectronics and UV protection

Kavitha,

Eshwarappa,

Shilpa

et al. 2024

Polymers for Advanced Techs

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Herein we report the method to tailor the band gap and UV absorption of polyvinyl alcohol (PVA)/graphene oxide (GO)‐silver (Ag)/glutaraldehyde (GA) hybrid polymer nanocomposites. The modifications brought by neutron irradiation to the optical and dielectric characteristics enabled the band gap and UV absorption‐tailored polymer nanocomposites to be obtained. Neutron‐irradiated samples, compared with their unirradiated counterparts, exhibit a reduction in transmittance to 78%, rendering them opaque to UV–visible light after irradiation. The energy band gap decreases from 5.25 to 4.09 eV upon irradiation. Furthermore, upon neutron‐irradiation the relaxation time increases from 7.63 × 10−4 to 0.02 s which is evident by the shift in electric modulus imaginary part (M") peak to a lower frequency region, indicating an increase in relaxation time. The Cole–Cole plot for irradiated samples demonstrates lower fitting parameter (α) values of the modified Havriliak–Negami function, indicating a departure from pure capacitor‐like behavior. The neutron irradiation leads to a decrease in conductivity from 44.6 × 10−7 to 0.09 × 10−7 S/cm.

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“…The separation performance was observed due to the hydrophilic nature of the membranes. Poly(vinyl alcohol) matrix has been filled with graphene or graphene oxide nanoparticles [83]. These nanomaterials based on poly(vinyl alcohol) and graphene oxide possess hydrogen and hydrophilic binding interactions.…”

Section: Efficiency Of Graphene Nanocomposite Membranes For Water or ...mentioning

confidence: 99%

Footsteps of graphene filled polymer nanocomposites towards efficient membranes—Present and future

Kausar,

Ahmad

2024

J. Polym. Sci. Eng.

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Due to rising global environmental challenges, air/water pollution treatments technologies especially membrane techniques have been focused. In this context, air or purification membranes have been considered effective for environmental remediations. In the field of polymeric membranes, high performance polymer/graphene nanocomposite membranes have gained increasing research attention. The polymer/graphene nanomaterials exposed several potential benefits when processed as membranes. This review explains utilizations of polymer and graphene derived nanocomposites towards membranes formation and water or gas separation or decontamination properties. Here, different membrane designs have been developed depending upon the polymer types (poly(vinyl alcohol), poly(vinyl chloride), poly(dimethyl siloxane), polysulfone, poly(methyl methacrylate), etc.) and graphene functionalities. Including graphene in polymers influenced membrane microstructure, physical features, molecular permeability or selectivity, and separations. Polysulfone/graphene oxide nanocomposite membranes have been found most efficient with enhanced rejection rate of 90%–95%, high water flux >180 L/m2/h, and desirable water contact angle for water purification purposes. For gas separation membranes, efficient membranes have been reported as polysulfone/graphene oxide and poly(dimethyl siloxane)/graphene oxide nanocomposites. In these membranes, N2, CO2, and other gases permeability have been found higher than even >99.9%. Similarly, higher selectivity values for gases like CO2/CH4 have been observed. Thus, high performance graphene-based nanocomposite membranes possess high potential to overcome the challenges related to water or gas molecular separations.

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A combined experimental and computational study of flexible polyvinyl alcohol (PVA)/graphene oxide (GO) nanocomposite films for superior UV shielding with improved mechanical properties

Cited by 6 publications

References 49 publications

Development of multilayer PVA-MMT and PVA-CS film structures by spin coating-assisted layer-by-layer technique: Effect of PVA, CS and MMT nanoclay orientation on oxygen barrier properties

Development of multilayer PVA-MMT and PVA-CS film structures by spin coating-assisted layer-by-layer technique: Effect of PVA, CS and MMT nanoclay orientation on oxygen barrier properties

Hybrid polymer nanocomposites with tailored band gaps and UV absorption for advanced applications in optoelectronics and UV protection

Footsteps of graphene filled polymer nanocomposites towards efficient membranes—Present and future

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