In situ high-temperature Raman study of crystalline nylon 6,12 fibers gamma-irradiated in argon atmosphere

Menchaca, Carmina; Manoun, Bouchaib; Martínez-Barrera, Gonzalo; Castaño, V. M.; López-Valdivia, H.

doi:10.1016/j.jpcs.2006.05.017

Cited by 16 publications

(11 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well known that the gamma radiation causes structural modifications of polymers via three main processes: scission, crosslinking, and grafting of chains involving generation of free radicals [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Compressive strength of gamma‐irradiated polymer concrete

et al. 2008

View full text Add to dashboard Cite

Polymer concrete (PC) was developed by using different concentrations of silica sand as aggregate and a commercial unsaturated preaccelerated (orthophtalic) polyester resin. The PC specimens were submitted to gamma radiation at several dosages: 5, 10, 50, 100, and 150 kGy. Mechanical performance was evaluated including the compressive strength, the compressive strain at yield point, and the compression modulus of elasticity. As expected, mechanical properties depend on both the resin concentration and the applied radiation dose. Improvement achieved in mechanical properties is related to the morphological characteristics observed by scanning electron microscopy.

show abstract

Section: Introductionmentioning

confidence: 99%

Compressive strength of gamma‐irradiated polymer concrete

et al. 2008

View full text Add to dashboard Cite

show abstract

“…The termination of every layer has carboxyl and carbonyl groups. N6,6 has an excellent mechanical resistance because of hydrogen bonds and their cross-linking and the long chains being brought along for attraction (Menchaca et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Electrospinning of polymeric nanofiber (nylon 6,6/graphene oxide) for removal of Cr (VI): synthesis and adsorption studies

2019

View full text Add to dashboard Cite

Polymer nanofibers are valuable materials that are of great importance because they are inexpensive and they display high strength. In this study, nylon-6,6 (N6,6)/graphene oxide (GO) nanofibers were developed and characterized. GO was synthesized from graphene using the known Hummer's method. GO is obtained by reaction of the graphene with strong oxidants and was characterized using Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The characterizations showed that the graphene was suitably oxidized. GO was added to N6,6 to produce N6,6/GO nanofibers at loadings of 0.5, 1.0, 1.5, and 2.0 wt% through the melt mixing method. The batch adsorption model for Cr (VI) adsorption was applied as a function of time, initial Cr (VI) concentration, adsorbent dosage, and pH to examine nanofiber activity. N6,6/GO a exhibited high adsorption capacity for Cr (VI) at pH 2.0. The maximum adsorption capacity for Cr (VI) ion was found to be 47.17 mg/g of N6.6/ GO using the related isotherm curves and equations. When the equilibrium data were examined, it was concluded that Langmuir adsorption isotherm was more suitable.

show abstract

“…Since nylon discovery, a great interest has been developed due to its technological importance, its commercial characteristic, and its complexity related to the morphological changes associated to its crystallinity, not only in solid state but also in solution and under melting point conditions. In general, nylon 6-6 (Ny) has excellent mechanical resistance due to the mutual attraction of their long chains due to hydrogen bonds and their cross-linking [7].…”

Section: Introductionmentioning

confidence: 99%

“…Electrospinning is a recognized technique to create polymer fibers with diameter ranging from 40 to 2000 nanometers. Fibers can be electrospun direct from solution or from the fused material state, controlling the diameter size through adjustment of the surface tension, solution concentration, conductivity, and so forth [5][6][7]. Electrospinning occurs when the electric force of the solution surface overcomes the surface tension and triggers an electric spark provoking the solution to be expelled from the containing device (syringe), and the jet flow impacts, deposits, and is collected in a metal screen.…”

Section: Introductionmentioning

confidence: 99%

Nylon/Graphene Oxide Electrospun Composite Coating

Menchaca‐Campos

García‐Pérez

Castañeda

et al. 2013

International Journal of Polymer Science

View full text Add to dashboard Cite

Graphite oxide is obtained by treating graphite with strong oxidizers. The bulk material disperses in basic solutions yielding graphene oxide. Starting from exfoliated graphite, different treatments were tested to obtain the best graphite oxide conditions, including calcination for two hours at 700°C and ultrasonic agitation in acidic, basic, or peroxide solutions. Bulk particles floating in the solution were filtered, rinsed, and dried. The graphene oxide obtained was characterized under SEM and FTIR techniques. On the other hand, nylon 6-6 has excellent mechanical resistance due to the mutual attraction of its long chains. To take advantage of the properties of both materials, they were combined as a hybrid material. Electrochemical cells were prepared using porous silica as supporting electrode of the electrospun nylon/graphene oxide films for electrochemical testing. Polarization curves were performed to determine the oxidation/reduction potentials under different acidic, alkaline, and peroxide solutions. The oxidation condition was obtained in KOH and the reduction in H2SO4solutions. Potentiostatic oxidation and reduction curves were applied to further oxidize carbon species and then reduced them, forming the nylon 6-6/functionalized graphene oxide composite coating. Electrochemical impedance measurements were performed to evaluate the coating electrochemical resistance and compared to the silica or nylon samples.

show abstract

In situ high-temperature Raman study of crystalline nylon 6,12 fibers gamma-irradiated in argon atmosphere

Cited by 16 publications

References 13 publications

Compressive strength of gamma‐irradiated polymer concrete

Compressive strength of gamma‐irradiated polymer concrete

Electrospinning of polymeric nanofiber (nylon 6,6/graphene oxide) for removal of Cr (VI): synthesis and adsorption studies

Nylon/Graphene Oxide Electrospun Composite Coating

Contact Info

Product

Resources

About