Infrared, Raman and INS studies of poly-ethylene oxide oligomers

Migliardo, F.; Magazù, Salvatore; Caccamo, Maria Teresa

doi:10.1016/j.molstruc.2013.05.060

Cited by 34 publications

(25 citation statements)

References 14 publications

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“…The new absorption peaks occurred in PEG-g-GN, which are associated with the characteristic peaks of PEG, such as methylene (C-H stretch near 2869, 2826 and 1433 cm À1 ) and ether bonds (C-O-C stretch in the range of 1100-1300 cm À1 ). 35,36 The result revealed the successful synthesization of PEG-g-GN.…”

Section: Resultsmentioning

confidence: 88%

Effects of poly(ethylene glycol)-grafted graphene on the electrical properties of poly(lactic acid) nanocomposites

et al. 2019

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Maleic anhydride was reacted with the armchair edges of graphene nanosheets (GN) via Diels-Alder reaction. Then, polyethylene glycol (PEG) was grafted onto the GN in the presence of anhydride groups through an esterification reaction. The PEG-grafted GN (PEG-g-GN) was characterised via FTIR analysis, thermogravimetric analysis, scanning electron microscopy, Raman spectroscopy and contact angle measurements, proving that PEG was successfully grafted onto the GN surface. The results indicated that PEG-g-GN possessed high electrical conductivity and was dispersed in polylactic acid (PLA). The composites were fabricated by using PEG-g-GN and GN as the conductive agent in the PLA matrix.Owing to the function of PEG molecular chains, PEG-g-GN can be uniformly dispersed in the PLA matrix and improve the tensile strength of composites to 59.46 MPa and conductivity to 9.69 Â 10 À4 S cm À1 at a PEG-g-GN content of 1 wt%.

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Section: Resultsmentioning

confidence: 88%

Effects of poly(ethylene glycol)-grafted graphene on the electrical properties of poly(lactic acid) nanocomposites

et al. 2019

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“…Such a spectroscopic technique explores 14000-10 cm -1 range of the e-m spectrum, which encompasses the Near-IR (NIR) range (14000-4000 cm −1 ), the Mid-IR (MIR) range (4000-400 cm −1 ), and the Far-IR (400-10 cm −1 ). FTIR is, in some regards, a complementary technique in respect to other techniques such as Raman and inelastic neutron spectroscopies and density function simulations [28,[41][42][43][44][45][46][47][48]. In the present study, the FTIR study was carried out in the range 400-4000 cm −1 with a spectral resolution of 4 cm −1 .…”

Section: Methodsmentioning

confidence: 99%

Self-Assembly Processes in Hydrated Montmorillonite by FTIR Investigations

Caccamo

Mavilia

et al. 2020

Materials

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Experimental findings obtained by FTIR and Raman spectroscopies on montmorillonite-water mixtures at three concentration values are presented. To get some insight into the hydrogen bond network of water within the montmorillonite network, FTIR and Raman spectra have been collected as a function of time and then analyzed following two complementary approaches: An analysis of the intramolecular OH stretching mode in the spectral range of 2700–3900 cm−1 in terms of two Gaussian components, and an analysis of the same OH stretching mode by wavelet cross-correlation. The FTIR and Raman investigations have been carried as a function of time for a montmorillonite-water weight composition (wt%) of 20–80%, 25–75%, and 35–65%, until the dehydrated state where the samples appear as a homogeneous rigid layer of clay. In particular, for both the FTIR and Raman spectra, the decomposition of the OH stretching band into a “closed” and an “open” contribution and the spectral wavelet analysis allow us to extract quantitative information on the time behavior of the system water content. It emerges that, the total water contribution inside the montmorillonite structure decreases as a function of time. However, the relative weight of the ordered water contribution diminishes more rapidly while the relative weight of the disordered water contribution increases, indicating that a residual water content, characterized by a highly structural disorder, rests entrapped in the montmorillonite layer structure for a longer time. From the present study, it can be inferred that the montmorillonite dehydration process promotes the layer self-assembly.

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“…The Fourier Transform InfraRed (FTIR) method allows the analysis of vibrational and rotational movements of molecules [53][54][55][56][57][58][59][60][61][62][63]. This method enables analysis of the 14,000-10 cm −1 range of the electromagnetic spectrum, which contains the Near-IR (4000-14,000 cm −1 ), the Mid-IR (400-4000 cm −1 ), and the Far-IR (10-400 cm −1 ).…”

Section: Methodsmentioning

confidence: 99%

Thermal Investigations on Carbon Nanotubes by Spectroscopic Techniques

2020

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Carbon nanotubes (CNTs) thanks to their unique physical properties have been employed in several innovative applications particularly for energy storage applications. Certain technical features of carbon nanotubes, such as their remarkable specific surface, mechanical strength, as well as their electron and thermal conductivity are suitable for these applications. Furthermore, in order to produce a device, thermal treatment is needed and for this reason the trend of thermal decomposition of the tubes plays a key role in the integration process. The main purpose of this work was to characterize the thermal behavior of CNTs. In particular, we show the findings of an experimental study on CNTs performed by means of Fourier Transform InfraRed and Raman spectroscopy investigations. The collected FTIR and Raman spectra were analyzed by using two innovative procedures: spectral distance (SD) and wavelet cross correlation (XWT). From both analyses, a relaxation temperature value emerged of T = 206 °C, corresponding to a relaxation inflection point. Such a system relaxation phenomenon, occurring in the fiber CNTs, could be connected with the decay of the mechanical properties due to a decrease in the alignment and compaction of the fibers.

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Infrared, Raman and INS studies of poly-ethylene oxide oligomers

Cited by 34 publications

References 14 publications

Effects of poly(ethylene glycol)-grafted graphene on the electrical properties of poly(lactic acid) nanocomposites

Effects of poly(ethylene glycol)-grafted graphene on the electrical properties of poly(lactic acid) nanocomposites

Self-Assembly Processes in Hydrated Montmorillonite by FTIR Investigations

Thermal Investigations on Carbon Nanotubes by Spectroscopic Techniques

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