Radiation Effects in Polyamides

Porubská, Mária

doi:10.5772/62464

Cited by 3 publications

(5 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This increment in viscosity can be explained through branching in the lower doses and crosslinking at the higher. It can be observed that samples irradiated in argon show the lowest variability between recycled and virgin species, and this phenomenon is most likely linked to the randomness of the irradiation process when performed in air, as secondary oxidation reactions take place [ 17 ]. The recycled sample has a lower starting viscosity value, and the tendency is reverted at higher absorbed doses.…”

Section: Resultsmentioning

confidence: 99%

“…The material presenting faster weight loss is the raw (virgin) sample irradiated at 100 kGy. It is known that scission events coexist with crosslinking under these irradiation conditions, and thus, chain rupture and polymer degradation result in chemical species that tend to decompose easily [ 17 ]. The main difference with its recycled counterpart is that crystallinity in this sample was about 20% higher; thus, bonds in the latter configuration are stronger.…”

Section: Resultsmentioning

confidence: 99%

“…This is particularly relevant when using gamma rays since samples need to be irradiated for longer periods of time compared to other radiation sources to obtain the same dose. Thus, the probability of the formed radicals reacting with oxygen increases [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Gamma Radiation on the Processability of New and Recycled PA-6 Polymers

Niño

Vidal²,

Cerro

et al. 2023

Polymers

View full text Add to dashboard Cite

The growing quantities of plastic waste have raised environmental concerns, with almost a quarter of disposed plastics being sent to landfill. This has motivated research efforts into various recycling technologies to ease dependence on fossil resources, increasing circularity. Irradiation of various kinds, such as electron beam, beta and gamma rays, has been studied in the past as a way of revamping end-of-life polymer properties. The present work focuses on the effects of gamma radiation on the processability of new and recycled polymers, which is intimately linked with their rheological properties. In this study, both virgin and recycled polymers were irradiated under different radiation doses and the effects of the radiation on their viscosity assessed and compared. Results were analyzed making use of different theoretical relationships, and the causes of the changes in rheology were investigated by means of various characterization techniques, such as GPC, FTIR, EPR and DSC. Finally, the rheological curves of all samples were fitted to the Ostwald–de Waele relationship and the dependence of its parameters on the absorbed dose fitted to a function.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Gamma Radiation on the Processability of New and Recycled PA-6 Polymers

Niño

Vidal²,

Cerro

et al. 2023

Polymers

View full text Add to dashboard Cite

show abstract

“…In every case, sensitivity coefficient values for irradiated samples were lower than for those not irradiated. Most of the radiation impact was exerted on the physical elasticity of the cable: the PA outer sheath became more rigid and less elastic due to radiation [20], leading to more cracks during handling and elongation and, therefore, to break sooner than non-irradiated samples (Figure 5). With the exception of the fibers, the standard samples, and the not irradiated V9 type, some cables broke during the test.…”

Section: Strain Sensitivity Coefficientsmentioning

confidence: 99%

Mechanical Properties of Optical Fiber Strain Sensing Cables under γ-Ray Irradiation and Large Strain Influence

Piccolo

Delépine-Lesoille

Friedrich³

et al. 2020

Sensors

View full text Add to dashboard Cite

Optical fiber strain sensing cables are widely used in structural health monitoring; however, the impact of a harsh environment on them is not assessed despite the huge importance of the stable performances of the monitoring systems. This paper analyzes (i) the impact of the different constituent layers on the behavior of a strain sensing cable whose constitutive materials are metal and polyamide, (ii) the radiation influence on the optical fiber strain sensing cable response (500 kGy of γ -rays), and (iii) the behavior of the cable under high axial strain (up to 1%, 10,000 μ ε ). Radiation impact on strain sensitivity is negligible for practical application, i.e., the coefficient changes by 4% at the max. The influence of the composition of the cable is also assessed: the sensitivity differences remain under 15%, a standard variation range when different cable compositions and structures are considered. The elasto-plastic behavior is at the end evaluated, highlighting the residual strain (about 1600 μ ε after imposing 10,000 μ ε ) of the cable (especially for metallic parts).

show abstract

“…The most widespread form of polymerization from academic and commercial perspectives is the free-radical polymerization technique which is broadly applicable to a wide range of monomers [10]. The effect of the electron accelerator and proton beam irradiation on both the mechanical and chemical properties of polyamide [11] and epoxy composites [12,13] were studied. Ahmad Anwar et al, in 2016, studied one of the space hazards affecting on polymeric materials by exposure of the polyimide to ionized and particulate radiation at a dose up to1000kGy by gamma source and evaluated its performance [14].…”

Section: Introductionmentioning

confidence: 99%

Influence of electron accelerator irradiation on epoxy nanocomposites materials for spacecraft structure

Anwar

Lotfy²,

Balboul

et al. 2020

Arab Journal of Nuclear Sciences and Applications

View full text Add to dashboard Cite

Different types of surfactants namely, nonionic, anionic and cationic represented by Polyoxyethylene sorbitan monooleate (Tween 80), sodium dodecyl sulfate (SDS), and cetyltrimethylammonium bromide (CTAB) respectively were used to select a proper type of surfactant enhancing dispersion quality of multiwall carbon nanotubes (MWCNTs) in the epoxy resin. In this study, the effect of electron beams whch are one of the most severe space environment threats. The candidate material proposed in this study will be used as a structural space material. The candidate material is characterized by furrier transformation infrared spectroscopy (FTIR) so as to identify the mechanical properties, surface tension, and electrical dispersion measurement. The mechanical results revealed that the strength increases by 10% while adding the CTAB surfactant, however, it decreases by 27% and 32% by adding tween-80 and SDS respectively. The anionic surfactant SDS, despite keeping the stiffness, the reference sample is of lower strength and elongation. The CTAB improves the mechanical properties by improving the strength and stiffness while elongation is significantly decreased by adding any of the surfactants. The surface tension of Tween 80 and anionic surfactant SDS, is σ = 24.4 mN/m while the surface tension in case of the CTAB is σ= 25.4 mN/m. The surface tension and electrical dispersion measurement results reveal that the nonionic surfactant Tween 80 led to a uniform dispersion of MWCNTs in the epoxy than other surfactants. The effect of 100-kGy irradiation via electron beam on structure and its electrical properties of the epoxy composites was studied. Improving the dispersion quality of the MWCNTs in epoxy nanocomposite materials leads to utilizing these materials in spacecraft structure.

show abstract

Radiation Effects in Polyamides

Cited by 3 publications

References 46 publications

Effect of Gamma Radiation on the Processability of New and Recycled PA-6 Polymers

Effect of Gamma Radiation on the Processability of New and Recycled PA-6 Polymers

Mechanical Properties of Optical Fiber Strain Sensing Cables under γ-Ray Irradiation and Large Strain Influence

Influence of electron accelerator irradiation on epoxy nanocomposites materials for spacecraft structure

Contact Info

Product

Resources

About