UV degradation model for polymers and polymer matrix composites

Lu, Tianyi; Solis-Ramos, E.; Yi, Yun–Bo; Kumosa, M.

doi:10.1016/j.polymdegradstab.2018.06.004

Cited by 160 publications

(97 citation statements)

References 28 publications

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“…This reduction may be related to the formation of new chromophore groups with different color characteristics, which can cause fading [9]. Furthermore, UV aging can reduce the surface roughness of polymers [31] or induce blistering formation [9], which can also lead to color modifications.…”

Section: Colorimetric Characterizationmentioning

confidence: 99%

Influence of Different Stabilization Systems and Multiple Ultraviolet A (UVA) Aging/Recycling Steps on Physicochemical, Mechanical, Colorimetric, and Thermal-Oxidative Properties of ABS

et al. 2020

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Commercially mass-polymerized acrylonitrile–butadiene–styrene (ABS) polymers, pristine or modified by stabilization systems, have been injection molded and repeatedly exposed to ultravilolet A (UVA) radiation, mechanical recycling, and extra injection molding steps to study the impact of such treatments on the physicochemical, mechanical, colorimetric, and thermal-oxidative characteristics. The work focus on mimicking the effect of solar radiation behind a window glass as relevant during the lifetime of ABS polymers incorporated in electrical and electronic equipment, and interior automotive parts by using UVA technique. The accelerated aging promotes degradation and embrittlement of the surface exposed to radiation and causes physical aging, deteriorating mechanical properties, with an expressive reduction of impact strength (unnotched: up to 900%; notched: up to 250%) and strain at break (>1000%), as well as an increase in the yellowing index (e.g., 600%). UV-exposition promotes a slight increase in the tensile modulus (e.g., 10%). The addition of antioxidants (AOs) leads to a limited stabilization during the first UVA aging, although the proper AO formulation increases the thermal-oxidative resistance during all the cycles. Mechanical recycling promotes an increase in strain at break and unnotched impact strength alongside a slight decrease in tensile modulus, due to disruption of the brittle surface and elimination of the physical aging.

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Section: Colorimetric Characterizationmentioning

confidence: 99%

Influence of Different Stabilization Systems and Multiple Ultraviolet A (UVA) Aging/Recycling Steps on Physicochemical, Mechanical, Colorimetric, and Thermal-Oxidative Properties of ABS

et al. 2020

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“…A cumulative damage model was used to estimate the photodegradation of the polymer surface . According to this model, the approximate function for calculating the total effective dosage is proposed by the following equation:

D_{total} ((), t) = \int_{0}^{\overset{false˜}{t}} \int_{λ_{\min}}^{λ_{\max}} E_{0} ((),, λ, t) ((), 1 - e^{- A ((), λ)}) normalΦ ((), λ) italicdλdt

where

\overset{t}{true}

and t are the elapsed time and total irradiation time (s).…”

Section: Resultsmentioning

confidence: 99%

Micromechanics analysis of carbon fiber/epoxy microdroplet composite under UV light irradiation by micro‐Raman spectroscopy

Tan

et al. 2020

Polymer Composites

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Evaluation of the surface morphology, chemical groups, interfacial microstructure, and mechanical properties of carbon fiber/epoxy resin microdroplet composites during ultraviolet photodegradation was carried out. The axial stress distribution and interfacial shear stress (ISS) distribution of the carbon fiber/microdroplet composite at 0.25% and 0.62% strains with different UV irradiation times were obtained using micro‐Raman spectroscopy. The results showed that after 40 hours of UV irradiation, tiny particles appeared on the surface of the carbon fiber/microdroplet sample, and with prolonged irradiation, the tiny particles grew larger and more in number. Benzyl methyl ketone was observed after 40 hours of UV irradiation, and the formation of the quinone methide structure, which causes the discoloration of composite, appeared after 300 hours of UV irradiation, and the tiny particles formed on the composite might be benzyl methyl ketone. The maximum axial stress reduced to 53% and 37%, and maximum shear stress reduced to 67% and 66%, for the 0.25% and 0.62% strain samples, respectively, when the UV irradiation time was extended to 940 hours. A power‐law function of ISS with irradiation times was proposed and is represented by τ0.25 = 66.78 ‑ 8.296 × 10–6 t2.26 and τ0.62 = 81.24 ‑ 2.20 × 10–6 t2.49. It was further determined that the loss of mechanical properties was slow during the first 300 hours of UV irradiation. This work provides a new approach for studying the influence of UV irradiation on the interfacial properties of fiber/polymer composite.

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“…Actually, it is well known that UV rays have a significant aging effect on the polymers, which are extensively used in outdoor applications. The main results of UV exposure of polymers are the breaking of polymer chains due to photo‐oxidative aging, the formation of carbonyl (CO) and vinyl (CHCH 2 ) groups, and the deterioration of the physical, mechanical, and chemical properties of these polymers …”

Section: Introductionmentioning

confidence: 99%

Ultraviolet radiation aging impact on physicochemical properties of crosslinked polyethylene cable insulation

Hedir

Moudoud

Lamrous

et al. 2019

J of Applied Polymer Sci

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This article deals within the study of the effect of artificial radiations on physical and chemical properties of the crosslinked polyethylene (XLPE) material, widely used for manufacturing high-voltage cables. Within this framework, several experimental tests, using essential characterization techniques, were performed to study XLPE behavior under ultraviolet (UV) aging. Attenuated total reflection Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy were thus carried out to identify the main structure changes of the material before and after exposure to UV. In addition, appearance changes and DC (Direct Current) volume resistivity were evaluated. The obtained results showed that UV radiation has a great effect on the physicochemical properties of XLPE cable insulation.

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UV degradation model for polymers and polymer matrix composites

Cited by 160 publications

References 28 publications

Influence of Different Stabilization Systems and Multiple Ultraviolet A (UVA) Aging/Recycling Steps on Physicochemical, Mechanical, Colorimetric, and Thermal-Oxidative Properties of ABS

Influence of Different Stabilization Systems and Multiple Ultraviolet A (UVA) Aging/Recycling Steps on Physicochemical, Mechanical, Colorimetric, and Thermal-Oxidative Properties of ABS

Micromechanics analysis of carbon fiber/epoxy microdroplet composite under UV light irradiation by micro‐Raman spectroscopy

Ultraviolet radiation aging impact on physicochemical properties of crosslinked polyethylene cable insulation

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