Alterations of molecular characteristics of polyethylene under the influence of heat treatment

Barkhudaryan, Vigen G.

doi:10.1007/s12588-016-9151-6

Cited by 2 publications

(1 citation statement)

References 22 publications

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“…This photooxidative effect leads to higher incidence of morphological changes causing a deterioration of mechanical properties of polymers [ 14 ] and may conduct to the scission of covalent bonds on polymer chains randomly and substantial decrease in molecular weight [ 15 ]. Effects of UV radiation on the structural, physical and mechanical properties of polyolefins (e.g., LDPE, high density polyethylene, HDPE, linear low density polyethylene, LLDPE, and polypropylene, PP) have been studied [ 16 – 19 ]. Fairbrother et al [ 20 ] studied the effects of temperature and light intensity on photodegradation of HDPE and reported that UV-exposure yielded a rapid embrittlement of HDPE was concurrent with increases in yield strength, stiffness, oxidation, and crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Quantifying time-dependent structural and mechanical properties of UV-aged LDPE power cables insulations

HEDIR¹,

SLIMANI²,

MOUDOUD³

et al. 2022

Turkish Journal of Chemistry

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This paper reports effects of ultraviolet (UV) light radiation on the physicochemical, electrical and mechanical properties of low-density polyethylene (LDPE) cable insulating materials. Changes in structural and morphological properties of UV-aged samples were characterized by various analytical methods such as attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Additionally, elongation at break, tensile strength, dielectric strength, and optical properties were also evaluated. Changes in some physical properties of LDPE after exposing to UV irradiation clearly highlighted that the polymer underwent the structural degradation. In addition, it was also found that such degradation yielded both crosslinking and chain scission as two competing processes during UV aging.

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Section: Introductionmentioning

confidence: 99%

Quantifying time-dependent structural and mechanical properties of UV-aged LDPE power cables insulations

HEDIR¹,

SLIMANI²,

MOUDOUD³

et al. 2022

Turkish Journal of Chemistry

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Molecular Transformations in DNA under the Influence of UV-radiation

Vigen

Gayane

Nelli

et al. 2021

CAPS

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Background: The processes of destruction and crosslinking of macromolecules occur simultaneously under the influence of ultraviolet (UV) radiation in synthetic polymers, dry DNA and their concentrated solutions. Objective: The effect of UV radiation on calf thymus DNA in dilute solutions subjected to UV- irradiation was studied in this work. Method: The calf thymus DNA was studied in dilute solutions using viscometry, absorption spectroscopy and electrophoresis. Results: It was shown, that at a low concentration of DNA in the buffer solution ([DNA] = 85 μg / ml) under the influence of UV radiation, the processes of destruction of macromolecules and an increase in their flexibility predominate, which is accompanied by a gradual decrease in the viscosity of their solution. In addition, due to the low concentration of the solution, intramolecular crosslinking of macromolecules predominates, which also reduces their size and, consequently, the viscosity of the solution. Conclusion: It was concluded, that in dilute DNA solutions, due to the predominance of the processes of intramolecular crosslinking of macromolecules over intermolecular, only constant processes of decreasing the sizes of DNA macromolecules occur. As a result, its solubility remains virtually unchanged during UV irradiation. The described comments are also excellently confirmed by the results of absorption spectroscopy and electrophoresis

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Alterations of molecular characteristics of polyethylene under the influence of heat treatment

Cited by 2 publications

References 22 publications

Quantifying time-dependent structural and mechanical properties of UV-aged LDPE power cables insulations

Quantifying time-dependent structural and mechanical properties of UV-aged LDPE power cables insulations

Molecular Transformations in DNA under the Influence of UV-radiation

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