Abstract
The structure and dynamics of poly(ethylene oxide) (MW 400, PEO400) intercalated in the galleries of a layered fluoromica clay were investigated by spin-label electron spin resonance (ESR), XRD, DSC, and TGA. PEO400 was end-labeled by attachment of a nitroxide radical and intercalated in 0.78 nm clay galleries. The ESR spectra of intercalated PEO400 showed two motional components, fast and slow, which were attributed to polymer segments weakly and strongly interacting with the clay interface, respectively, while a single spectral component was measured for bulk PEO400. The rotational diffusion coefficient for the polymer chain segment, RS, was determined by simulating the temperature variation of the ESR spectra, based on the “macroscopic order with microscopic disorder” (MOMD) model. The effect of the molecular weight was assessed by comparison with the previous study of PEO4000 (PEO4K [Miwa, Y.; et al. Macromolecules 2008, 41, 4701−4708]. The values of log RS for bulk PEO400 and PEO4K at 330 K were 8.8 ...
Published Version
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