Stibnite Nanoparticles as a New Stabilizer for Poly (Methyl Methacrylate) Exposed to Gamma Irradiation

Albuquerque, Marília Cordeiro Carneiro de; Garcia, Olga Pinheiro; Aquino, Kátia Aparecida da Silva; Araújo, Patrícia Lopes Barros de; Araújo, Elmo S.

doi:10.1590/1516-1439.000814

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…Stabilizers like free radical scavengers (primary antioxidants) can prevent the main scission and cross-linking 13,21 . In addition, our most recent studies have shown the efficiency of using nanoparticles in the same amount of commercial additives as stabilizers for PMMA and Poly (vinyl chloride) (PVC) exposed to gamma radiation [22][23][24][25] .…”

Section: Commercial Additives For Polymer Matrixmentioning

confidence: 99%

Study of Commercial Additive Effects on the Poly(methyl methacrylate) Exposed to Gamma Irradiation by Viscosimetric Analysis

Aquino,

Oliveira,

Santos

et al. 2023

Mat. Res.

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Poly(methyl methacrylate) (PMMA) is a polymer with applications in the medical and aerospace industries that require resistance to gamma radiation. However, the effects caused by gamma radiation on PMMA properties may make its application in situations of exposure to gamma radiation unfeasible. In this study, the impact of commercial additives on the radiolytic stabilization of PMMA will be studied through viscosimetric assays. In a preliminary trial, additives with different mechanisms of action were tested, and the efficacy of two additives (Tinuvin 770 and Tinuvin 622) hindered amine stabilizers (HAS) types were registered. PMMA films with the additives at different concentrations were exposed to gamma radiation and studied through viscosimetric molar mass and G-value. The Tinuvin 622 at 0.3 wt% showed the best performance in the radiolytic stabilization of p PMMA films at the 20-50 kGy range. Antagonism was observed when Tinuvin 700 and Tinuvin 622 mixture was studied in different proportions. These results show the potential of commercial additives, initially produced for other purposes, in the radiolytic stabilization of PMMA.

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Section: Commercial Additives For Polymer Matrixmentioning

confidence: 99%

Study of Commercial Additive Effects on the Poly(methyl methacrylate) Exposed to Gamma Irradiation by Viscosimetric Analysis

Aquino,

Oliveira,

Santos

et al. 2023

Mat. Res.

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“…In addition, a decrease in ZnS stabilizing action occurred when its concentration reached 1.00 %wt. This is a rather common effect in polymer-additives systems as optimum additive concentration is overreached 13,14 .…”

Section: Radiostabilizing Action Of Zns Nanocrystals In Pvc Matrixmentioning

confidence: 99%

“…These extreme transient conditions allow synthesis on the benchtop, at room-temperature conditions, in media that would otherwise require high temperatures, high pressures, or long reaction times 11,12 . Zinc sulfide sonochemical synthesis is a suitable preparation method, which allows fast and simple obtention of morphologically pure products [13][14][15][16][17][18] , circumventing tedious and laborious methods already described in the literature 19,20 . PVC has applications that range from rigid pipes to electron-beam or gamma irradiation sterilizable medical devices..…”

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confidence: 99%

ZnS Nanocrystals as an Additive for Gamma-Irradiated Poly (Vinyl Chloride)

Silva

Araújo

et al. 2018

Mat. Res.

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Zinc sulfide (ZnS) was synthesized by sonochemical method and nanoparticles with crystallite size around 2 nm were obtained. PVC containing ZnS nanoparticles at concentrations of 0.10; 0.30; 0.50; 0.7 and 1.00 wt% were gamma irradiated ( 60 Co) at room temperature in air. No appreciable decrease in PVC Viscosity-Average Molar Mass (M v ) was observed for samples containing 0.7 wt% of ZnS nanocrystals. It was demonstrated that the addition of ZnS nanocrystals imparted molecular protection to the polymer matrix while improving flexibility, by decreasing the Young Modulus of PVC films. These results suggest the use of sonochemically synthesized ZnS nanocrystals as a new additive for radiation-grade PVC materials.

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Analysis of PVC Produced With An Environmentally Friendly Additive Exposed to Gamma Radiation

Silva

Araújo

Madaleno

et al. 2019

Macromolecular Symposia

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Commercial Poly(vinyl chloride) (PVC) compounds are based on the combination of the polymer and additives that gives the formulation necessary for the end‐use. In medical‐device applications, PVC may be treated by gamma irradiation in sterilization process. As a consequence of ionization during irradiation, PVC chains undergo simultaneously crosslinking and scission effects. Therefore, it is necessary the study of new additives with radiolytic stabilization characteristics. In this study, the vegetable oil extracted from coffee grounds (OCG) was incorporated in PVC resin as an additive to produce PVC films and PVC test specimens. The viscosity measurements showed that OCG is a promising radioprotection at 0.5 wt% concentration. The results of mechanical and thermal properties are also discussed. The aim of this study is to show that it is possible to develop a formulation for processing PVC with radiation resistance and, at the same time, friendly to the environment due to recycle the wastes from coffee industry.

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Stibnite Nanoparticles as a New Stabilizer for Poly (Methyl Methacrylate) Exposed to Gamma Irradiation

Cited by 6 publications

References 22 publications

Study of Commercial Additive Effects on the Poly(methyl methacrylate) Exposed to Gamma Irradiation by Viscosimetric Analysis

Study of Commercial Additive Effects on the Poly(methyl methacrylate) Exposed to Gamma Irradiation by Viscosimetric Analysis

ZnS Nanocrystals as an Additive for Gamma-Irradiated Poly (Vinyl Chloride)

Analysis of PVC Produced With An Environmentally Friendly Additive Exposed to Gamma Radiation

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