Middle Macroradicals and Their Influence on the Strength of Oriented Polymers

Tomashevskii, E. E.; Kvachadze, N. G.

doi:10.1134/1.1924857

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Hdpe Epr Spectrum1

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2012

2015

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Cited by 4 publications

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“…2a and b. Polyolefin Commercial denomination MFI (g/10 min) Cristallinity (%) T g (K) S (*10 16 spin/g) g // g t g av g iso P 1 P 2 P 3 P 4 P 5 and two hyperfine constants a a-H ¼ 23.2 G (one proton in a position) and a b-4H ¼ 25.1 G (four protons in b position) accounting for 7%. Both g value and hyperfine constants of the alkyl radical, Ak, match well with previous Endor investigations [27,45]. Note that I a does not have any proton in a position while I b possesses one H a and only three H b .…”

Section: Hdpe Epr Spectrumsupporting

confidence: 83%

Comparative study of gamma-irradiated PP and PE polyolefins part 1: Identification and quantification of radicals using electron paramagnetic resonance

Fel

Khrouz

Massardier

et al. 2015

Polymer

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Section: Hdpe Epr Spectrumsupporting

confidence: 83%

Comparative study of gamma-irradiated PP and PE polyolefins part 1: Identification and quantification of radicals using electron paramagnetic resonance

Fel

Khrouz

Massardier

et al. 2015

Polymer

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HYSCORE and Davies ENDOR study of irradiated ultra high molecular weight polyethylene

Paganini¹,

Brunella²,

Chiesa³

2012

Magnetic Reson in Chemistry

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Ultra high molecular weight polyethylene (UHMWPE) has been studied with different magnetic resonance techniques to elicit information on the nature and the location of radicals generated during high energy irradiation. Field swept electron paramagnetic resonance, pulsed Davies electron nuclear double resonance and hyperfine sublevel correlation spectroscopic measurements allowed extracting for the first time the full 1H hyperfine coupling tensors of the most abundant radical, i.e. a secondary alkyl radical and to ascertain the formation of allyl radicals in the first stages of the irradiation process. The 1H hyperfine coupling tensors are analogous to those reported for single crystal irradiated polyethylene, suggesting that radicals generated in UHMWPE are located in the crystalline region of the polymer. Copyright © 2012 John Wiley & Sons, Ltd.

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