FT-Raman Studies of Semi-Crystalline Nylon 6, 12 Filaments

Olivares, M.; Mondragón, M.A.; Vázquez‐Polo, G.; Martínez, E.; Castaño, V. M.

doi:10.1080/00914039808034839

Cited by 9 publications

(12 citation statements)

References 5 publications

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“…They were irradiated with gamma radiation at different doses (15,50,100,200, and 300 kGy) at room temperature (21°C). du Pont de Nemours, Wilmington, DE, were used.…”

Section: A Materialsmentioning

confidence: 99%

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Long-term irradiation effects on gamma-irradiated Nylon 6,12 fibers

et al. 2008

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Long-term effects on Nylon 6,12 crystalline fibers irradiated six years ago have been determined, including chemical structure and morphology, and their relationship with storage time. Results from x-ray diffraction, small-angle x-ray scattering, scanning electron microscopy, and atomic force microscopy are reported for those fibers and for freshly irradiated ones. Some results for non-irradiated samples are included for comparison. Changes in the shape and size of the crystals (crystallinity degree) are found; the crystallite size increases with storage time. Both surface and bulk changes are seen in the morphology. Surface damage increases with storage time. Changes observed can be attributed to irradiation causing chain scission, which, in turn, causes crystal reorganization. The present results reinforce interpretation of earlier results obtained for concretes reinforced with irradiated Nylon fibers.

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“…They were irradiated with gamma radiation at different doses (15,50,100,200, and 300 kGy) at room temperature (21°C). du Pont de Nemours, Wilmington, DE, were used.…”

Section: A Materialsmentioning

confidence: 99%

“…[11][12][13][14][15][16][17][18][19][20] The property improvement occurs not only in irradiated polymers but also in composites containing such polymers. [11][12][13][14][15][16][17][18][19][20] The property improvement occurs not only in irradiated polymers but also in composites containing such polymers.…”

Section: Introductionmentioning

confidence: 99%

Long-term irradiation effects on gamma-irradiated Nylon 6,12 fibers

et al. 2008

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“…The intensity ratio of Raman I D /I G is used to examine the surface defect level of the GNS reinforcement. [28,29] Compared with the raw GNS materials, the I D /I G value of the GNS-FGH96 powder has been slightly increased, which demonstrates that the solution mixing process can preserve the original structure of GNS reinforcements. Figure 3 shows the SEM microstructures of the GNS-FGH96 composite in axial, radial, and tangential directions.…”

Section: Microstructure Of Gns-fgh96 Powder Mixturesmentioning

confidence: 98%

Anisotropic Mechanical Properties of Graphene Nanosheet–Reinforced Powder Metallurgy Nickel‐Based Superalloy

et al. 2020

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Nickel-based superalloys [1] are key materials in airplane and turbine disks due to their outstanding properties such as high tensile strength and excellent creep deformation resistance. With the increasing requirements of the modern aerospace industry on the performance of materials, traditional nickel alloys are gradually unable to meet the demands of high properties. Thus, selecting the nanoreinforcement phase to construct metal matrix composites (MMCs) is one of the simple and easy ways to improve the performance of materials. [2] The MMC materials [3] not only possess excellent performance of the metal matrix, but also combine several advantages such as high tensile properties, good thermal expansion, low thermal expansion coefficient, and good wear resistance originating from the reinforcement phase. Graphene [4,5] and its related derivative materials (such as graphene oxide (GO), [6] multilayer graphene, [7] graphene nanosheets (GNS), [8] graphene nanoflakes (GNFs) [9]) are a series of 2D materials with unique layered hexagonal honeycomb structure. It is considered to be an ideal reinforcement phase for MMCs due to its unique structure and extraordinary electronic, mechanical, and thermal properties. In the reported literature, graphene-reinforced MMCs (Al, [10] Cu, [11] Ti, [9,12] Ni, [13,14] etc.) have been successfully prepared by hot isostatic pressing (HIP), [15] spark plasma sintering (SPS), [16] laser additive manufacturing (LAM), [17] and so on. These graphene-reinforced MMCs show impressive strength and toughness. A small amount of added graphene can greatly improve the mechanical properties of the MMCs, such as tensile properties and wear resistance. Regarding the mechanical properties of graphene-reinforced MMCs, the uniform graphene dispersion, the bonding interface between graphene and the matrix, and the arrangement of graphene in the matrix are still the main factors influencing the large-scale applications of graphene-reinforced MMCs. [18] The dispersion and arrangement of graphene in the matrix are the basic factors affecting the MMCs. The poor dispersion and disordered arrangement will result in agglomeration of graphene and weakly bonded interfaces between reinforcement and matrix phases. These defects lead to crack initiation and propagation, [19] which ultimately weakens the reinforcing effect of graphene. Therefore, improving the properties of MMCs by structural design to change the spatial distribution pattern of the micro-/ nanograde reinforcement phase in the matrix has become urgent in current research.

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“…Gamma radiation is one of the techniques employed for nylon fibers modification and recrystallization [6,7]. Few reports about the effect of gamma radiation on Nylons have been found [6][7][8], and relatively few reports have been published on characterization of nylon with Raman spectroscopy [9][10][11]. The application of the Raman technique to this kind of polymers has proved to be pretty convenient in terms of acquisition times, no fluorescence interference, very good quality of the spectra obtained, working in solid state and easiness in handling the sample.…”

Section: Introductionmentioning

confidence: 99%