Abstract
The translational diffusion of nitroxide spin probes in nylon films was investigated by means of a sublimative desorption method, and compared with their rotational diffusion as determined by an electron spin resonance (ESR) technique in our previous papers. The translational diffusion coefficients D calculated using McBain’s formula were dependent on the structures of the spin probes, and on the structures of the nylons. The Arrhenius plots of D defined one distinct crossover point for each probe in the temperature range examined, which was quite consistent with that found in the Arrhenius plots of the rotational diffusion coefficients R. This suggests that the motional change of the nylon chains affects not only the translational motions of the probes but also their rotation. However, the activation energies for translational and rotational diffusion were very different; the activation energies for translation were larger below the crossover point than above it, whereas those for rotation behaved in the opposite manner. This discrepancy can perhaps be explained by the differences between the time-scales of the motions detected in the translational and rotational measurements. The results obtained here are compared with those for polyethylene, natural rubber, and polyisobutylene reported elsewhere.
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Hamada, K., Amachi, K., Yonetake, K. et al. Translational and Rotational Diffusion of Spin Probes in Nylon Films. Polym J 19, 701–708 (1987). https://doi.org/10.1295/polymj.19.701
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DOI: https://doi.org/10.1295/polymj.19.701
