A study on the severe crazing phenomenon of the PMMA canopy under prolonged exposure to tropical climates

Kim, Ik-Sik; Cho, Hwanjeong; Sohn, Kyung-Suk; Kim, Kyung Woo; Kim, Sinkon

doi:10.1016/j.engfailanal.2021.105719

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…Thanks to SPME technology, volatile substances with a wide range of boiling points can be analyzed without the creation of artifacts. 21,22 In SPME, volatile compounds are extracted from the headspace of solid or liquid samples and placed on a fused-silica fiber coated with a polymeric phase. 23 All the analyses were conducted on Agilent 5973 inert GC/MS system, with an EI system electron source.…”

Section: Head Space-solid Phase Microextraction Coupled With Gas Chro...mentioning

confidence: 99%

Failure analysis of fiberglass cover used for photovoltaic plants

Cepolina

Gabrielli

Ferla

et al. 2023

J of Applied Polymer Sci

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Cover boxes with inspection glass are generally used outdoors for photovoltaic systems. Sometimes these boxes break, during normal use. High temperature, thermal stress, cyclic stress, and cracking contribute to weakening the polymeric inspection "glass". The study presents an interdisciplinary analysis to discover the mode of occurrence and causes of the failure. First, the material is accurately characterized. Then its mechanical behavior is characterized in a virtual scenario that reconstructs the real external environment. The goal is to build a new cover with inspection boxes that exhibits superior life cycle behavior when exposed to harsh weather conditions and atmospheric agents. The breaking phenomena of solar panels covering boxes in PMMA (Poly Methyl Methacrylate) are examined. Environmental stress is the main responsible for cracking. Styrene is employed in the polymerization process of Sheet Molding Compound (SMC); the diffusion of this material is the main responsible for cracking. Comprehensive engineering analysis shows how the thermoplastic component fails after being exposed to atmospheric agents. The PMMA "glass" is one of the polymers most sensible to the crazing phenomena.

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Section: Head Space-solid Phase Microextraction Coupled With Gas Chro...mentioning

confidence: 99%

Failure analysis of fiberglass cover used for photovoltaic plants

Cepolina

Gabrielli

Ferla

et al. 2023

J of Applied Polymer Sci

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“…Light exposure in the environment, especially ultraviolet light irradiation, can easily lead to the degradation of wooden cultural relics and their organic protection material, polyethylene glycol [14][15][16] , resulting in changes in color, gloss, ductility and strength [17~20], and losing the function of protective materials [17][18][19][20] . In this paper, PEG2000 was used as the research object, and three wavelengths of ultraviolet light were used to simulate different environmental conditions (such as indoor, outdoor and strong aging), and gloss and FT-IR spectra were used to evaluate the aging degree of PEG2000 from the perspective of surface morphology and chemical structure.…”

Section: Introductionmentioning

confidence: 99%

Study on aging behavior of polyethylene glycol under three wavelengths of ultraviolet light irradiation

Zhou,

Shang,

Wei

et al. 2023

Preprint

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Polyethylene glycol (PEG2000) is commonly used for the dehydration and reinforcement of waterlogged wooden cultural relics, and its photo-aging degradation will seriously affect the long-term conservation of the wooden cultural relics. In this study, the photo-aging characteristics and mechanisms of PEG2000 under UV irradiations of three wavelength were comprehensively investigated, and the surface morphology, crystal structure, and relative molecular weight of PEG2000 were systematically characterized. The results showed that PEG2000 showed a higher gloss loss rate, carbonyl index and crystallinity, and a wider molecular weight distribution with increasing aging time, especially under the irradiation of 313nm ultraviolet light. The aging mechanism of PEG2000 was proposed based on FTIR and 1H NMR analyses, and it was found that the degradation occurred at the C-H and ether (C-O-C) bonds on the main chain, forming a large number of ester and ethoxy structures. The aging degree of PEG2000 was evaluated from the perspective of surface morphology and chemical structure by gloss and FTIR spectroscopy, and it was found that the combination of gloss loss rate and carbonyl index was more suitable to evaluate the aging degree of the sample. The relevant theoretical research will provide reliable guidance for the preservation of polyethylene glycol in waterlogged wooden cultural relics.

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“…Light exposure in the environment, especially ultraviolet light irradiation, 17 can easily lead to the degradation of wooden cultural relics and their organic protection material, polyethylene glycol, 18,19 resulting in changes in color, 20 gloss, ductility, and strength, 21 and losing the function of protective materials. 22,23 Therefore, we used three different wavelengths of ultraviolet light to simulate the aging rate of PEG2000 under different environments (indoor, outdoor, and strong aging), evaluated the aging degree of samples comprehensively from the perspective of surface morphology and chemical structure using surface gloss loss rate and carbonyl index.…”

Section: Introductionmentioning

confidence: 99%