Study of gel formation by ionizing radiation in polypropylene

Oliani, Washington Luiz; Parra, D.F.; Fermino, Danilo Marin; Riella, Humberto Gracher; Lima, L.F.C.P.; Lugão, Ademar B.

doi:10.1016/j.radphyschem.2012.06.053

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…Figure reveals the presence of the diffraction peaks of (110), (040), (130), and (131) + (041) planes at 2θ ≈ 15°, 17°, 19°, and 22°, respectively, for all the polymeric samples. These crystalline planes show that PP samples present the α-phase of PP, with a monoclinic unit cell . The presence of the plane (130) indicates the polymorphism of PP, a common phenomenon in crystalline polymers .…”

Section: Resultsmentioning

confidence: 92%

“…These crystalline planes show that PP samples present the α-phase of PP, with a monoclinic unit cell. 39 The presence of the plane (130) indicates the polymorphism of PP, a common phenomenon in crystalline polymers. 40 These diffractograms exhibit all the peaks of PP, suggesting that the structure of PP was maintained during the process of obtaining the composite.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Polypropylene Modified with Ag-Based Semiconductors as a Potential Material against SARS-CoV-2 and Other Pathogens

Assis

Ribeiro

Gonçalves

et al. 2022

ACS Appl. Polym. Mater.

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The worldwide outbreak of the coronavirus pandemic (COVID-19) and other emerging infections are difficult and sometimes impossible to treat, making them one of the major public health problems of our time. It is noteworthy that Ag-based semiconductors can help orchestrate several strategies to fight this serious societal issue. In this work, we present the synthesis of α-Ag 2 WO 4 , β-Ag 2 MoO 4 , and Ag 2 CrO 4 and their immobilization in polypropylene in the amounts of 0.5, 1.0, and 3.0 wt %, respectively. The antimicrobial activity of the composites was investigated against the Gram-negative bacterium Escherichia coli, the Gram-positive bacterium Staphylococcus aureus, and the fungus Candida albicans. The best antimicrobial efficiency was achieved by the composite with α-Ag 2 WO 4 , which completely eliminated the microorganisms in up to 4 h of exposure. The composites were also tested for the inhibition of SARS-CoV-2 virus, showing antiviral efficiency higher than 98% in just 10 min. Additionally, we evaluated the stability of the antimicrobial activity, resulting in constant inhibition, even after material aging. The antimicrobial activity of the compounds was attributed to the production of reactive oxygen species by the semiconductors, which can induce high local oxidative stress, causing the death of these microorganisms.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Polypropylene Modified with Ag-Based Semiconductors as a Potential Material against SARS-CoV-2 and Other Pathogens

Assis

Ribeiro

Gonçalves

et al. 2022

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…[36][37][38]. PP modified by irradiation (12.5 kGy) did not show b-crystals nucleating ability [11], while with the addition of AgNPs the b phase occurred.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 83%

“…The radiation yield of chain scission in polymers is treated as a measure of the radiation yield of multi-ionization spurs [7]. Polymers absorb the energy of ionizing radiation in a heterogeneous form [8] and in amorphous region there is a variety of sizes of spurs [9] that form nucleation points where microgels and nanogels appear [10,11].…”

Section: Introductionmentioning

confidence: 99%

AgNPs polypropylene gel films–thermal study and antibacterial activity

Oliani

Lima

Rogero

et al. 2015

J Therm Anal Calorim

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In this work, antibacterial activity was investigated in polypropylene gel containing silver nanoparticles (AgNPs). The PP was modified by crosslink under gamma radiation process of pristine PP, in acetylene atmosphere and dose of 12.5 kGy, followed by thermal treatment. The thin films of the polypropylene gel (AgNPs-GelPP) were obtained by extraction in boiling xylene for period of 12 h at 138°C, followed by decantation at room temperature of 25°C. The films of AgNPs-GelPP were characterized using scanning electron microscopy, energy-dispersive spectroscopy, transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and X-ray diffraction. Cytotoxicity tests and reduction of the colony forming number unit were performed in the films. Efficiency of the silver nanoparticles on antibacterial activity was evaluated and analyzed versus DSC. The results showed that crystallinity cooperates to bactericidal effect.

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Dual Function of Cellulose Triacetate–Graft–Polymethacrylic Acid Films for Dyes Removal and for High-Dose Radiation Dosimetry

Awadallah‐F

Sobhy

2017

J Polym Environ

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Study of gel formation by ionizing radiation in polypropylene

Cited by 12 publications

References 17 publications

Polypropylene Modified with Ag-Based Semiconductors as a Potential Material against SARS-CoV-2 and Other Pathogens

Polypropylene Modified with Ag-Based Semiconductors as a Potential Material against SARS-CoV-2 and Other Pathogens

AgNPs polypropylene gel films–thermal study and antibacterial activity

Dual Function of Cellulose Triacetate–Graft–Polymethacrylic Acid Films for Dyes Removal and for High-Dose Radiation Dosimetry

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