Pragmatic Aspects of silence

Ghiţă, Andreea; Piétri, Etienne

doi:10.1515/9783110965063-039

Cited by 2 publications

(2 citation statements)

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“…Observing the spectra of Fe 3 O 4 /GPTMS and Fe 3 O 4 /APTES, the peak at around 3438 cm −1 seemed to decrease in intensity and broaden signifying the possible functionalization of Fe 3 O 4 NPs 42 . The peaks observed between 1100–900 cm −1 indicate the presence of Si‐O‐Si vibrations in the structure GPTMS and APTES molecules 43 . Absorption bands at approximately 1250 and 912 cm −1 in 3 (see Figure 5(a)) are ascribed to the symmetric and asymmetric stretching vibration of the C‐O‐C the epoxy ring of GPTMS 44 while the bands at 1020 cm −1 were attributed to the Si–O stretching vibration in APTES found on the magnetic NPs 41 .…”

Section: Resultsmentioning

confidence: 95%

Thermal and mechanical properties of epoxy resin reinforced with modified iron oxide nanoparticles

Baghdadi

Youssef

Bouhadir

et al. 2021

J of Applied Polymer Sci

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Epoxy polymers, having good mechanical properties and thermal stability, are often used for engineering applications. Their properties can be further enhanced by the addition of iron oxide (Fe3O4) nanoparticles (NPs) as fillers to the resin. In this study, pristine Fe3O4 NPs were functionalized with polydopamine (PDA), (3‐glycidoxypropyl)trimethoxysilane (GPTMS), and (3‐aminopropyl)trimethoxysilane (APTES). X‐ray diffraction and scanning electron microscopy (SEM) were used to study any changes in the crystal structure and size of the NPs while Fourier‐Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA) were used to ensure the presence of functional groups on the surface. The mechanical properties of the Fe3O4‐based nanocomposites generally improved except when reinforced with Fe3O4/PDA. The maximum improvement in tensile strength (∼34%) and fracture toughness (∼13%) were observed for pristine Fe3O4‐based nanocomposites. Dynamic mechanical analysis (DMA) showed that the use of any of the treated NPs improved the material's initial storage modulus and had a substantial impact on its dissipation potential. Also, it was observed that the glass transition temperature measurements by DMA and differential scanning calorimetry were below that of pure epoxy. SEM of the cracked surfaces shows that the incorporation of any NPs leads to an enhancement in its thermal and mechanical properties.

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