Electron Paramagnetic Resonance Spectroscopy

Jeschke, Gunnar

doi:10.1002/14356007.q09_q01

Cited by 2 publications

(3 citation statements)

References 71 publications

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“…( Jeschke, 2016 ) Samples of approximately 35 mm long, 5 mm wide and 3 mm thick were sectioned from a cured resin plaque and subjected to irradiation in various environments. The irradiated sections were then dried and placed in a Q800 DMA (TA Instruments.…”

Section: Methodsmentioning

confidence: 99%

“…(1) n EPR − total number of EPR lines k − equivalent nuclei I − spin state i − runs over the groups of equivalent nuclei Dynamic Mechanical Analysis (Jeschke, 2016) Samples of approximately 35 mm long, 5 mm wide and 3 mm thick were sectioned from a cured resin plaque and subjected to irradiation in various environments. The irradiated sections were then dried and placed in a Q800 DMA (TA Instruments.…”

Section: Electron Paramagnetic Resonancementioning

confidence: 99%

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On the Mechanism of the Steady-State Gamma Radiolysis-Induced Scissions of the Phenyl-Vinyl Polyester-Based Resins

et al. 2022

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The major societal problem of polymeric waste necessitates new approaches to break down especially challenging discarded waste streams. Gamma radiation was utilized in conjunction with varying solvent environments in an attempt to discern the efficacy of radiolysis as a tool for the deliberate degradation of model network polyesters. Our EPR results demonstrated that gamma radiolysis of neat resin and in the presence of four widely used solvents induces glycosidic scissions on the backbone of the polyester chains. EPR results clearly show the formation of alkoxy radicals and C-centered radicals as primary intermediate radiolytic products. Despite the protective role of the phenyl groups on the backbone of the radiation-induced polyester chains, the radiolytic-glycosidic scissions predominate. Among the following three solvents used in this study (water, isopropyl alcohol, and dichloromethane), the highest radiolytic yield of glycosidic scission was achieved using water. The •OH radicals produced in the radiolysis of phenyl unsaturated polyester aqueous suspensions very rapidly abstract H atoms from the methylene group, which is followed by a very rapid glycosidic scission. The lowest glycosidic yield was found in the dichloromethane solutions of these polyester resins due to scavenging by the fast electron capture reactions.

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Section: Methodsmentioning

confidence: 99%

Section: Electron Paramagnetic Resonancementioning

confidence: 99%

On the Mechanism of the Steady-State Gamma Radiolysis-Induced Scissions of the Phenyl-Vinyl Polyester-Based Resins

et al. 2022

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“…where 𝑀 is the number of the adjacent H atoms, and 𝐼 is the spin number of the nuclei [141]. The concentration of radicals in each sample can also be determined by using a standard sample with a known number of spins per gram and calculating the concentration of the sample being studied by proportion.…”

Section: Electron Paramagnetic Resonance (Epr)mentioning

confidence: 99%

On the Mechanism of the Ionizing Radiation-Induced Degradation and Recycling of Cellulose

List,

Gonzalez-Lopez,

Ashfaq

et al. 2023

Polymers

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The use of ionizing radiation offers a boundless range of applications for polymer scientists, from inducing crosslinking and/or degradation to grafting a wide variety of monomers onto polymeric chains. This review in particular aims to introduce the field of ionizing radiation as it relates to the degradation and recycling of cellulose and its derivatives. The review discusses the main mechanisms of the radiolytic sessions of the cellulose molecules in the presence and absence of water. During the radiolysis of cellulose, in the absence of water, the primary and secondary electrons from the electron beam, and the photoelectric, Compton effect electrons from gamma radiolysis attack the glycosidic bonds (C-O-C) on the backbone of the cellulose chains. This radiation-induced session results in the formation of alkoxyl radicals and C-centered radicals. In the presence of water, the radiolytically produced hydroxyl radicals (●OH) will abstract hydrogen atoms, leading to the formation of C-centered radicals, which undergo various reactions leading to the backbone session of the cellulose. Based on the structures of the radiolytically produced free radicals in presence and absence of water, covalent grafting of vinyl monomers on the cellulose backbone is inconceivable.

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Electron Paramagnetic Resonance Spectroscopy

Abstract: The article contains sections titled: 1. Introduction 2. Principles of EPR … Show more

Cited by 2 publications

References 71 publications

On the Mechanism of the Steady-State Gamma Radiolysis-Induced Scissions of the Phenyl-Vinyl Polyester-Based Resins

On the Mechanism of the Steady-State Gamma Radiolysis-Induced Scissions of the Phenyl-Vinyl Polyester-Based Resins

On the Mechanism of the Ionizing Radiation-Induced Degradation and Recycling of Cellulose

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