Structural Changes Undergone During Thermal Aging and/or Processing of Unstabilized, Dry-blend and Rigid PVC, Investigated by FTIR-ATR and Curve Fitting

amar, Zineb Hadj; Chabira, Salem Fouad; Sebaa, M.; Benchatti, Ahmed

doi:10.18280/acsm.430109

Cited by 9 publications

(6 citation statements)

References 32 publications

(61 reference statements)

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“…The absorption bands observed in ATR-FTIR spectra before and after aging at 80 and 100℃ are given in Figure 11. In the spectrum of the untreated sample, the main peaks at 2850 -2950 cm -1 , 1255-1275 cm-1 , 1425-1458 cm -1 and 741 cm -1 , characteristic for a PVC structure, were found, which are attributed to C-H (valence), C-C (valence), C-H (deformation), and C-Cl valance bands, respectively [25][26][27][28][29][30][31][32]. In the FTIR spectra of PVC after treatment at 80℃ and 100℃, the intensity of the bands decreased as compared to the untreated sample.…”

Section: Atr-ftir Spectroscopy Resultsmentioning

confidence: 98%

Investigation of Hydrothermal Aging on Polyvinyl Chloride (PVC) Used in Medium Voltage Cables

Ouazzou¹,

Nedjar²,

Hocine³

et al. 2022

ACSM

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This investigation deals with the effect of hydrothermal aging on the electrical insulating properties of polyvinyl chloride used in medium voltage cables. The evolution of dielectric properties (dielectric loss factor, dielectric constant, dielectric strength and volume resistivity) as a function of aging time and temperature has been studied. After that, the mechanical characteristics (elongation at break and tensile strength) were also determined. Physico-chemical analysis was performed to highlight the structural changes induced by hydrothermal aging. Infrared spectroscopy using the Fourier transform (ATR-FTIR) and thermogravimetric analysis (TGA-DTA) have been performed. The results obtained show that the loss factor and dielectric constant increase gradually with the increase of temperature, while the volume resistivity decreases. At 100℃, the general shape of the curves giving the evolution of dielectric properties as a function of aging time shows that both loss factor and dielectric constant increase while those of volume resistivity and dielectric strength decrease. In the case of 80℃, the loss factor decreases slightly and the dielectric constant remains almost constant with aging time, whereas the volume resistivity and dielectric strength increase. The activation energy varies with aging time. The impact of hydrothermal aging on the properties of the material has been established in this study. At the beginning of aging, the degradation is mainly due to the elimination of molecular HCl. At more advanced stages of aging, the degradation is attributed to the elimination of HCl and double bonds formation followed by a change in color. Other consequences of the degradation like crosslinking and swelling of the samples are also noticed.

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Section: Atr-ftir Spectroscopy Resultsmentioning

confidence: 98%

Investigation of Hydrothermal Aging on Polyvinyl Chloride (PVC) Used in Medium Voltage Cables

Ouazzou¹,

Nedjar²,

Hocine³

et al. 2022

ACSM

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“…These polyene sections absorb light, discoloring the polymer. [ 158–162 ] High degradation levels and a lack of oxygen both induce reactions whereby double bonds facilitate PVC chain crosslinking. [ 53 ] Secondary reactions, especially in the presence of oxygen, can introduce many other chain structures and functionalities.…”

Section: Mechanical Recycling Of Poly(vinyl Chloride)mentioning

confidence: 99%

Mechanical Recycling of Packaging Plastics: A Review

Schyns

Shaver

2020

Macromol. Rapid Commun.

804

692

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The current global plastics economy is highly linear, with the exceptional performance and low carbon footprint of polymeric materials at odds with dramatic increases in plastic waste. Transitioning to a circular economy that retains plastic in its highest value condition is essential to reduce environmental impacts, promoting reduction, reuse, and recycling. Mechanical recycling is an essential tool in an environmentally and economically sustainable economy of plastics, but current mechanical recycling processes are limited by cost, degradation of mechanical properties, and inconsistent quality products. This review covers the current methods and challenges for the mechanical recycling of the five main packaging plastics: poly(ethylene terephthalate), polyethylene, polypropylene, polystyrene, and poly(vinyl chloride) through the lens of a circular economy. Their reprocessing induced degradation mechanisms are introduced and strategies to improve their recycling are discussed. Additionally, this review briefly examines approaches to improve polymer blending in mixed plastic waste streams and applications of lower quality recyclate.

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“…Such observed peak was already described in a similar study. 44 The spectrum also shows the typical doublet of the phthalates at 1580 cm À1 . The bands corresponding to the carbonyl and ester group, as well as those corresponding to the aromatic and aliphatic C-H bonds can also be observed and Table 3 shows these bands, according to Refs.…”

Section: Infrared Spectroscopy Characterization Of Pvc Pipesmentioning

confidence: 92%

“…48 This can be explained by a dehydrochlorination process. 44 The increase in peak intensity (875, 965, 1101, and 2853 cm À1 ) for the sample aged at 90 C can be explained by the fact that the additives (plasticizer and stabilizer) have migrated from the core of the samples to the surface. The same result was found by Jakubowicz et al, 49 when studying the effects of accelerated and natural aging on plasticized polyvinyl chloride (PVC).…”

Section: Infrared Spectroscopy Characterization Of Pvc Pipesmentioning

confidence: 99%

Mechanical, thermal and physico-chemical behavior of virgin and hydrothermally aged polymeric pipes

Jemii

Hammiche

Boubakri

et al. 2020

Journal of Thermoplastic Composite Materials

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In this paper, an experimental study was conducted to characterize industrial PVC pipes and to investigate the effect of hydrothermal aging on their physico-chemical, thermal, and mechanical behavior. Three temperature (25°C, 60°C and 90°C) and full immersion in distilled water were retained as accelerated hydrothermal conditions. Kinetic of water absorption was examined and Fickian behavior was observed. The aging temperature was found to influence the water uptake behavior of PVC samples. Thermogravimetric analysis (TGA) has proved that the pipe material is not pure, while it consists of PVC reinforced with calcium carbonate (CaCO3). After exposure to accelerated aging, TGA and FTIR analysis exhibit preliminary signs of degradation of PVC samples under the retained conditions. Changes affecting the shape and the color of aged samples were examined. Mechanical properties have been characterized, after immersion of 30 days, with an improvement of strength and stiffness of the aged samples, in particular at elevated aging temperature. However, the aging response is accompanied by a loss of ductility for the aged material. These results, even for brief exposure, could help to understand the behavior of PVC composite pipes under hydrothermal conditions.

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Structural Changes Undergone During Thermal Aging and/or Processing of Unstabilized, Dry-blend and Rigid PVC, Investigated by FTIR-ATR and Curve Fitting

Cited by 9 publications

References 32 publications

Investigation of Hydrothermal Aging on Polyvinyl Chloride (PVC) Used in Medium Voltage Cables

Investigation of Hydrothermal Aging on Polyvinyl Chloride (PVC) Used in Medium Voltage Cables

Mechanical Recycling of Packaging Plastics: A Review

Mechanical, thermal and physico-chemical behavior of virgin and hydrothermally aged polymeric pipes

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