Radiation chemistry of poly(ethyl methacrylate)—I. Interpretation of ESR spectra

SynopsisA simple technique has been proposed for the measurement of the diffusion coefficient of oxygen into polymeric spheres. The technique is based on the scavenging of radicals produced by high energy radiation by oxygen. The diffusion coefficient of oxygen determined for poly(methy1 methacrylate) has shown an inverse dependency on the dose received. Diffusion coefficient determined for low doses ( D = 3.4 X lo-* d / s ) as well as that determined after extrapolation to zero dose (4 = 3.7 X cmz/s) are in excellent agreement with the values reported in the literature.

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Determination of diffusion coefficient of oxygen into polymers by using electron spin resonance spectroscopy. I. Poly(methyl methacrylate)

Kaptan

Pekcan

Arca

et al. 1989

J of Applied Polymer Sci

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Investigation of γ‐irradiated syndiotactic poly(2‐methylheptyl methacrylate) using NMR spectroscopy

Dong

Hill

O’Donnell

et al. 1995

Macro Chemistry & Physics

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Syndiotactic poly(2-methylheptyl methacrylate) which was y-irradiated at room temperature to a dose of 1600 kGy was investigated by NMR spectroscopy. The 'H and 13C resonances for the macromolecular chain were assigned by using the 2D and the DEPT (distortionless enhancement by polarization transfer) technique. The spin-echo modified 2D NMR pulse sequence was used to investigate the small molecules and new structures which were formed during y-irradiation. The radiation mechanisms for cleavage of the side chain from the main chain and formation of double bonds from both the main chain and the side chain have been formulated based upon the NMR analysis.

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The Effect of Uncertainties in the Kuhn‐Mark‐Houwink‐Sakurada Constants on the Quantitative Analysis by Gel Permeation Chromatography

Deniz

Güven

1986

Brit. Poly. J.

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The effect of uncertainties in Kuhn‐Mark‐Houwink‐Sakurada (KMHS) constants on weight average and number average molecular weights and molecular weight distributions of some poly(ethyl methacrylate) samples have been investigated. Parameters were computed by the Weiss and Cohn‐Ginsberg method. Whereas errors introduced in Mw, Mn and HI values due to uncertainty in the K value are insignificant, uncertainties in the KMHS exponent present a serious problem. Deviations of ± 3% around a particular a value cause a ± 20% error in Mw and ± 15% error in Mn, values. The effect of deviations in the KMHS exponent on the HI values is dependent on the polydisperity of the sample investigated.

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Radiation chemistry of poly(ethyl methacrylate)—I. Interpretation of ESR spectra

Cited by 8 publications

References 11 publications

Determination of diffusion coefficient of oxygen into polymers by using electron spin resonance spectroscopy. I. Poly(methyl methacrylate)

Determination of diffusion coefficient of oxygen into polymers by using electron spin resonance spectroscopy. I. Poly(methyl methacrylate)

Investigation of γ‐irradiated syndiotactic poly(2‐methylheptyl methacrylate) using NMR spectroscopy

The Effect of Uncertainties in the Kuhn‐Mark‐Houwink‐Sakurada Constants on the Quantitative Analysis by Gel Permeation Chromatography

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