Novel bionanocomposite films based on graphene oxide filled starch/polyacrylamide polymer blend: structural, mechanical and water barrier properties

Nzenguet, Annie Moussemba; Aqlil, Meryem; Essamlali, Younes; Amadine, Othmane; Snik, Asmae; Larzek, Mohamed; Zahouily, Mohamed

doi:10.1007/s10965-018-1469-7

Cited by 46 publications

(16 citation statements)

References 70 publications

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“…Owing to the high surface area to volume ratio of the nano‐sized fillers combined with the quantum size effect, nanocomposite materials often exhibit improved properties compared with their bulk counterparts . Polyacrylamide (PAAM) is a synthetic linear, insulating and polar polymer having (CO‐NH 2 ) groups that have strong interfacial interactions with other polymers and enable the polymer to form hydrogen bonds with drug molecules, facilitating drug diffusion and release . PAAM has some advantages such as its permanent biocompatibility, good stability and resistance to degradation, non‐toxicity, and biological inertness .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, PAAM should be blended with another polymer and/or modified with a nano‐filler for some situations. Incorporation of 1 wt% graphene oxide (GO) into a starch/PAAM blend improved the tensile strength by 167.17% . Poly(vinyl alcohol) (80%)/PAAM (20%) network reinforced with 5 wt% nanocellulose showed remarkable improvement in thermal and mechanical properties .…”

Section: Introductionmentioning

confidence: 99%

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Influence of MWCNTs in Improving the Optical, DC Conductivity, and Mechanical Properties of CMC/PAAM Blends

El‐Gamal

Sayed

2020

Polymer Engineering & Sci

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Enhancing the optical, electrical, and mechanical properties of polymeric materials, by blending with another material and doping with nano-fillers, is crucial for improving their performance in optoelectronic, biological, and medical applications. In this work, the influence of adding multiwalled carbon nanotubes (MWCNTs) on the physical properties of carboxymethyl cellulose/polyacrylamide blends is reported. Scanning electron microscopy was used for investigating films' surface morphology and revealed good distribution of MWCNTs on the blend surface. UV-vis-IR spectroscopy showed that absorption and refractive indices, and other dispersion parameters could be controlled by adjusting the films' compositions. Loading 2 wt% MWCNTs narrowed the optical bandgap of the blend from 5.1 to 4.1 eV. Doping with MWCNTs raised the DC conductivity by about two orders of magnitude by forming threedimensional pathways within the blend matrix. The storage modulus increased with MWCNTs loading by 39.3% for the 2 wt% ratio while decreasing with increasing temperature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of MWCNTs in Improving the Optical, DC Conductivity, and Mechanical Properties of CMC/PAAM Blends

El‐Gamal

Sayed

2020

Polymer Engineering & Sci

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“…Today, several methods exist to improve the strength and the physicochemical properties of PAM matrixes by blending the matrix with chitosan, starch or other polymers [ 66 ]. While functionalization of pure PAM polymeric surfaces is mostly done via sunlight exposure at standard environmental conditions, a limited number of studies include plasma processing [ 67 , 68 , 69 , 70 , 71 ].…”

Section: Introductionmentioning

confidence: 99%

Entropy and Random Walk Trails Water Confinement and Non-Thermal Equilibrium in Photon-Induced Nanocavities

et al. 2020

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Molecules near surfaces are regularly trapped in small cavitations. Molecular confinement, especially water confinement, shows intriguing and unexpected behavior including surface entropy adjustment; nevertheless, observations of entropic variation during molecular confinement are scarce. An experimental assessment of the correlation between surface strain and entropy during molecular confinement in tiny crevices is difficult because strain variances fall in the nanometer scale. In this work, entropic variations during water confinement in 2D nano/micro cavitations were observed. Experimental results and random walk simulations of water molecules inside different size nanocavitations show that the mean escaping time of molecular water from nanocavities largely deviates from the mean collision time of water molecules near surfaces, crafted by 157 nm vacuum ultraviolet laser light on polyacrylamide matrixes. The mean escape time distribution of a few molecules indicates a non-thermal equilibrium state inside the cavity. The time differentiation inside and outside nanocavities reveals an additional state of ordered arrangements between nanocavities and molecular water ensembles of fixed molecular length near the surface. The configured number of microstates correctly counts for the experimental surface entropy deviation during molecular water confinement. The methodology has the potential to identify confined water molecules in nanocavities with life science importance.

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“…Polyacrylamide (PAM) is a linear, biocompatible, nontoxic, and polar polymer. Its ability to make strong interactions with other polymers and with the drug molecules, via the hydrogen bonding formation, facilitates its use for drug diffusion and release . Although it exhibits some weak mechanical properties, the blending of CMC and PAM is expected to provide a good film .…”

Section: Introductionmentioning

confidence: 99%

“…Its ability to make strong interactions with other polymers and with the drug molecules, via the hydrogen bonding formation, facilitates its use for drug diffusion and release. [11][12][13][14] Although it exhibits some weak mechanical properties, the blending of CMC and PAM is expected to provide a good film. 12 Mohy El-din et al 15 reported the ability of CMC-g-PAM to concentrate the dilute solutions of bovine serum albumin.…”

Section: Introductionmentioning

confidence: 99%

Characterization, optical, and nanoscale free volume properties of Na‐CMC/PAM/CNT nanocomposites

Awad

El‐Gamal

Sayed

et al. 2019

Polymers for Advanced Techs

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Polyblend and nanocomposite films of sodium salt of carboxymethylcellulose (Na‐CMC)/polyacrylamide (PAM) and Na‐CMC/PAM modified with carbon nanotubes (CNT) were synthesized by the solution casting technique. The effect of PAM and CNT loading on the structural, optical, and nanoscale free volume properties of Na‐CMC was studied. X‐ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy exhibited the existence of strong interactions between Na‐CMC and PAM and the non‐destructive effect of CNT on Na‐CMC/PAM structure. The HR‐TEM revealed the multi‐walled structure of CNT with a 7.06‐nm wall thickness and a 6.92‐nm wall inner diameter. Positron annihilation lifetime spectroscopy (PALS) was done, in a vacuum and at 30°C to 200°C, to investigate the nanoscale free volume properties by using a conventional fast‐fast coincidence spectrometer. It was found that the o‐Ps lifetime (τ3) and free volume (Vh) increase with increasing CNT percentage in the Na‐CMC/PAM blend. The distribution of the o‐Ps lifetime was broadened with increasing CNT ratios. Furthermore, the glass transition temperature (Tg) increases with increasing loads of CNT. For the first time, a correlation was done between Urbach energy (EU) and Vh. Finally, the results were represented and discussed in the frame of free volume properties. Optical measurements showed that the transmittance T% of Na‐CMC/PAM was 91.12% and decreased to 68.42% and 36.45% after loading with 1.0 and 2.0 wt % CNT. In addition, the blend shows higher insulating properties compared with the individual polymers. The CNT incorporation reduces the band gap significantly and increases the EU in the films.

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Novel bionanocomposite films based on graphene oxide filled starch/polyacrylamide polymer blend: structural, mechanical and water barrier properties

Cited by 46 publications

References 70 publications

Influence of MWCNTs in Improving the Optical, DC Conductivity, and Mechanical Properties of CMC/PAAM Blends

Influence of MWCNTs in Improving the Optical, DC Conductivity, and Mechanical Properties of CMC/PAAM Blends

Entropy and Random Walk Trails Water Confinement and Non-Thermal Equilibrium in Photon-Induced Nanocavities

Characterization, optical, and nanoscale free volume properties of Na‐CMC/PAM/CNT nanocomposites

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