TG and DSC studies of natural and artificial aging of polypropylene

Rjeb, M.; Labzour, A.; Rjeb, A.; Sayouri, S.; Claire, Y.; Périchaud, A.

doi:10.1016/j.physa.2005.06.023

Cited by 23 publications

(17 citation statements)

References 7 publications

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“…The method ESEM eliminates totally the effects of loads and allows the observation of samples non-drivers without any preparation. Equipped with a complete system of microanalyses X (Detector EDX-EDAX) and of a detector of the electrons retro diffused, it allows giving the chemical composition of this [17,18].…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Natural Ageing of Stabilized and Unustabilized Ldpe Films Used as Greenhouses Covering Materrials: Atr-Ftir and Sem Analysis

.¹

2015

IJRET

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This article focuses on the study of both stabilized and unstabilized low-density polyethylene films aged under natural weathering in the middle of Morocco (Sidi Kacem city). The study was undertaken on three samples for each LDPE films: a new sample taken as reference; another exposed to outdoor weathering for one year; and a sample exposed for two years. The outdoor exposure effects were followed by analysis of the total reflection Fourier transform infrared spectroscopy (ATR-FTIR). This technique provides information on the main chemical functions and evaluates the internal causes of natural ageing of our samples. The infrared spectra show the formation of hydroperoxides -O-OH, carbonyls >C=O, aliphatic esters R-(CO)-O-R, ether R-O-R, vinyl C=C, vinylidene >C=CH 2 and trans-vinylene RHC=CRH in the amorphous regions. These compounds lead to initiate the mechanism of photo-oxidation of the unstabilized LDPE samples. Therefore, the increase in the formation of oxidation products into the aged samples (LDPEUS) indicates an accelerated degradation of these latter on climatic factors (UV, O2, humidity, rain ...). The UV stabilizer (free radicals scavengers) added to the formulation of LDPE films can delay the attack of the amorphous phase and prevent the formation of compounds that can cause and accelerate photo-oxidation. The results obtained by the infrared have been confirmed by observing the morphology of the samples with scanning electron microscopy technology (SEM).

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Section: Scanning Electron Microscopymentioning

confidence: 99%

Natural Ageing of Stabilized and Unustabilized Ldpe Films Used as Greenhouses Covering Materrials: Atr-Ftir and Sem Analysis

.¹

2015

IJRET

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“…During these physical and chemical processes, a small change in energy can be monitored by differential scanning calorimetry (DSC) (Rjeb et al 2005). Van De Ven et al (2012) characterised thermal stability and decomposition of Rediset with the use of simultaneous DSC-TG analysis as shown in Figure 6.…”

Section: Effect Of Rediset On the Physicochemical Properties Of Asphamentioning

confidence: 99%

Evaluation of Rediset for use in warm-mix asphalt: a review of the literatures

Hamzah

Golchin

Jamshidi

et al. 2014

International Journal of Pavement Engineering

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This literature review paper presents the effects of a chemical warm mix additive, named Rediset on the rheological properties of asphalt binders, laboratory performance of asphalt mixtures, field behaviour of constructed road sections, energy consumption and air pollution, physicochemical properties of asphalt binders and behaviour of asphalt mortar. The rheological effects of Rediset on asphalt binder were evaluated from the viewpoint of very high temperature properties (viscosity of asphalt binder and workability of asphalt mixtures), high temperature properties (rutting resistance of asphalt binders and mixtures), intermediate temperature (fatigue behaviour) and also low temperature cracking properties. Other topics such as the mechanisms of temperature reduction by Rediset, storage stability of Rediset modified binders, moisture susceptibility, mix design issues, volumetric properties and economic benefits were also investigated. The information reported in this paper will help decision makers to appropriately select, apply and evaluate this warm additive type. In addition, researchers can identify gaps in existing knowledge for future research.

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“…The maximum at about 450 nm can be assigned to the 6 A 1 + 6 A 1 → 4 T 1 (4G) + 4 T 1 ( 4 G) excitation of an Fe(III) -Fe(III) pair, which is as result of the magnetic coupling of electronic spins of next-nearest neighbor Fe(III) ions and referred to as a pair excitation or double excitation process [23]. A feature near 390 nm correspond to the 6 A 1 → E 4 ( 4 D) ligand field transitions of Fe(III) [25]. Judging by the very pale-yellow color of studied sample, a weak magnetic coupling can be suggested [21].…”

Section: Uv-vis Studymentioning

confidence: 99%

“…6). The C1s peak situated at 284.6 eV is ascribed to the carbon atoms in the aliphatic chain (C-C) [25]. The peak at 286.6 eV can be assigned to a C-OH group [26].…”

Section: Xps Studymentioning

confidence: 99%

Characterization of the citrate precursor, used for synthesis of nanosized Mg-Zn ferrites

Kassabova-Zhetcheva

2009

Open Chemistry

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Abstract:The citrate precursor has been used to synthesize nanocrystalline Mg-Zn-ferrites. The nature of the prepared precursor is characterized and compared with those of the precursors studied earlier, prepared by the same process. The study has been performed by inorganic and organic elemental analyses, Fourier Transformed Infrared Spectroscopy (FTIR), Mössbauer spectroscopy, X-ray Photoelectron Spectroscopy (XPS), Electron Paramagnetic Resonance (EPR), Electronic absorption spectrometry in the UV-VIS region, Differential Thermal analysis/ Thermogravimetry (DTA-TG) analyses, and X-ray diffraction (XRD) analysis.

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TG and DSC studies of natural and artificial aging of polypropylene

Cited by 23 publications

References 7 publications

Natural Ageing of Stabilized and Unustabilized Ldpe Films Used as Greenhouses Covering Materrials: Atr-Ftir and Sem Analysis

Natural Ageing of Stabilized and Unustabilized Ldpe Films Used as Greenhouses Covering Materrials: Atr-Ftir and Sem Analysis

Evaluation of Rediset for use in warm-mix asphalt: a review of the literatures

Characterization of the citrate precursor, used for synthesis of nanosized Mg-Zn ferrites

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