Electron spin resonance spectra of polymer radicals in aqueous solution

Florin, R. E.; Sicilio, F.; Wall, Leo A.

doi:10.6028/jres.072a.006

Cited by 22 publications

(11 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…to OH. The radicals generated by OH (or A) attack formed by steady-state radiolysis of aqueous solutions (13,14) or by the Ti3+-H20, flow system (15)(16)(17) were detected by direct, in situ esr observation. The flow method is limited by the requirement of considerable amounts of substrate to be investigated.…”

Section: Andh~-(ch~)-~~h~-(ch~)~-~~h~) Etc Asmentioning

confidence: 99%

See 1 more Smart Citation

Electron spin resonance of spin-trapped radicals of amines and polyamines. Hydroxyl radical reactions in aqueous solutions and γ-radiolysis in the solid state

Mossoba¹,

Rosenthal²,

Riesz³

1982

Can. J. Chem.

View full text Add to dashboard Cite

MAGDI M. MOSSOBA, IONEL ROSENTHAL, and PETER RIESZ. Can. J. Chem. 60, 1493 (1982). The reactions of hydroxyl radicals with methylamine, dimethylamine, trimethylamine, diethylamine, see-butylamine, ethylenediamine, 1,3-diaminopropane, putrescine, cadaverine, 1,7-diaminoheptane, ornithine, spermidine, spermine, agmatine, and arcaine in aqueous solutions have been investigated by spin-trapping and esr. Hydroxyl radicals were generated by the uv photolysis of H,O, and 2-methyl-2-nitrosopropane (MNP) was used as the spin-trap. The effects of ionizing radiation on the same polyamines in the polycrystalline state were also investigated. The free radicals produced by y-radiolysis of these solids at ro0.m temperature in the absence of air were identified by dissolution in aqueous solutions of MNP. The predominant reaction of OH with amines and polyamines below pH 7 was the abstraction of hydrogen atoms from a carbon that is not adjacent to the protonated amino group. For agmatine and arcaine which contain guanidinium groups abstraction occurred from the a-CH. Dimethylamine was oxidized to the dimethylnitroxyl radical by H,O, in the dark. y-Radiolysis of polyamines in the polycrystalline state generated radicals due to H-abstraction from either the a-CH or from a carbon atom in the middle of the alkyl chain. The deamination radical was obtained from ornithine. Faisant appel B la rpe et B I'utilisation de piegeurs de spin, on a itudiC la reaction des radicaux hydroxyles avec des solutions aqueuses des amines suivantes: methylamine, dimethylamine, trimethylamine, diethylamine, see-butylamine, Cthylknediamine, I diamino-1,3 propane, putrescine, cadavtrine, diamino-1,7 heptane, ornithine, spermidine, spermine, agmatine et arcaine. Les

show abstract

Section: Andh~-(ch~)-~~h~-(ch~)~-~~h~) Etc Asmentioning

confidence: 99%

“…The oxidation product 6 has also been produced in a titanous ion -hydrogen peroxide flow system (15,16).…”

Section: Ch3mentioning

confidence: 99%

Electron spin resonance of spin-trapped radicals of amines and polyamines. Hydroxyl radical reactions in aqueous solutions and γ-radiolysis in the solid state

Mossoba¹,

Rosenthal²,

Riesz³

1982

Can. J. Chem.

View full text Add to dashboard Cite

show abstract

“…These reactive species extract hydrogen from the PVA polymer chain to form radicals on the main chain. 14,[16][17][18] The radicals react with each other and the PVA molecular chain chemically combines to form a three-dimensional network structure to form a hydrogel containing a large amount of water. The PVA hydrogel formed through the γ irradiation did not melt even during heating up to approximately 90 C because the shape of the hydrogel was maintained by the three-dimensional covalent bonds.…”

Section: Resultsmentioning

confidence: 99%

“…13 The PVA polymer can be easily dissolved in water and irradiated with γ-rays or electron beams to produce a highly transparent, high-strength, and flexible crosslinked hydrogel without using a crosslinking agent. [14][15][16][17][18][19][20][21] PVA hydrogels are used in several medical applications. 12,[22][23][24][25][26][27][28][29][30][31][32] Radiationcrosslinked PVA hydrogel has been commercialized as a wound-dressing material.…”

Section: Introductionmentioning

confidence: 99%

Human organ phantoms for catheterization using the radiation crosslinking technique

Imanishi

Kimura

Miyamoto

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

An artificial organ based on polyvinyl alcohol (PVA) hydrogel was developed to train medical staff to improve their ablation therapy skills, by using the radiation cross-linking technique. The aqueous PVA solution was irradiated with γ-rays or electron beams to produce a highly transparent, high-strength, and flexible crosslinked hydrogel without using a crosslinking agent. Physical properties of the hydrogel, such as, gel fraction, swelling, and elastic modulus, were controlled by changing the radiation dose. The catheter ablation region on the surface of

show abstract

“…Hfcc of radicals on nitrogen atom is 1.47 in case of polyehyleneimine radical (Florin et al, 1968), and is around 1.0 in case of some organic monomer (Fessenden, 1974). The split pattern formed by nitrogen nucleus become triplet line.…”

Section: Comparison Of Hfcc and Split Pattern Of Esr Spectrummentioning

confidence: 96%