Polypropylene nanogel: “Myth or reality”

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

doi:10.1016/j.radphyschem.2011.12.011

Cited by 10 publications

(3 citation statements)

References 22 publications

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“…The assessment of PP resistance to oxidative breakdown was performed by the oxidation induction time (OIT), as it is the most illustrative method for assessing the effectiveness of stabilizers [8,9]. From the data presented (Table 1) it follows that the OIT of the original (granular) PP of the PP 1562R brand and PP of the PP H350FF/1 brand are very different, due to the different origin of the stabilizing systems used.…”

Section: Discussionmentioning

confidence: 99%

Effect of Processing and Radiation Exposure on the Structure and Properties of Polypropylene

Lisanevich

Galimzyanova

Rakhmatullina

et al. 2019

KEM

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While producing polymers as well as during their processing, a certain amount of stabilizers is introduced into the product, which should ensure polymer properties saving during processing and those of polymer products during storage and operation. However, in cases where medical products based on polypropylene are subjected to radiation sterilization, there are not enough stabilizers in it to save their characteristics during operation. In this regard, we made an assessment of the influence of processing conditions on the properties of polypropylene with a different set of stabilizers in the manufacture of products based on it, in order to assess the degree of influence of each technological operation, including the effects of ionizing radiation during sterilization. Processing and radiation exposure are shown to affect the properties of polypropylene. Nevertheless, the effect of ionizing radiation with an absorbed dose of 40-60 kGy exceeds the negative effect of thermo-oxidative breakdown greatly during the extrusion of PP. Polypropylene containing organophosphorus stabilizers (brand PP 1562R) is more susceptible to breakdown. This is indicated by low values of oxidation induction time, breakdown initial temperature, as well as high values of MFI after exposure to electron radiation. PP brand PP H350FF/1 whose stabilizing complex contains phenol-phosphite antioxidants is more resistant to breakdown during processing and sterilization. For both brands under study, it is apparently necessary to increase the content of stabilizing additives in order to save the properties at the level of the original unexposed material.

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Section: Discussionmentioning

confidence: 99%

Effect of Processing and Radiation Exposure on the Structure and Properties of Polypropylene

Lisanevich

Galimzyanova

Rakhmatullina

et al. 2019

KEM

View full text Add to dashboard Cite

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“…For preparation of the gel fraction analysis, we used a system of balloons attached to reflux distillers. The samples were involved in a stainless steel of 500 mesh and immersed in boiling xylene at 138°C for 12 h …”

Section: Methodsmentioning

confidence: 99%

Development of a nanocomposite of polypropylene with biocide action from silver nanoparticles

Oliani

Parra

Lima

et al. 2015

J of Applied Polymer Sci

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This article presents the production of films based on blends of polypropylene (PP) and modified PP with the insertion of silver nanoparticles (AgNPs) produced to generate a bactericidal effect. The 50/50 blend of PP and PP modified by irradiation in acetylene at a dose of 12.5 kGy was processed in a twin-screw extruder. The addition of AgNPs in poly(N-vinyl-2-pyrrolidone) (PVP) solution was performed during processing in the extruder. The material was characterized by ultraviolet-visible spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy, transmission electron microscopy, cytotoxicity assay, and a reduction in colonyforming units. The PP-PVP1% AgNP film showed silver particles in the nanoscale, presented no cytotoxicity for mammalian cells, and presented antimicrobial effects against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacteria.

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“…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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Polypropylene nanogel: “Myth or reality”

Cited by 10 publications

References 22 publications

Effect of Processing and Radiation Exposure on the Structure and Properties of Polypropylene

Effect of Processing and Radiation Exposure on the Structure and Properties of Polypropylene

Development of a nanocomposite of polypropylene with biocide action from silver nanoparticles

AgNPs polypropylene gel films–thermal study and antibacterial activity

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