Abstract
Electron spin resonance (ESR) was applied to estimate the segmental dynamics of poly(cyclohexyl methacrylate) (PCHMA) and poly(cyclohexyl acrylate) (PCHA) in their miscible blend. The PCHMA and PCHA chains were labeled with nitroxide radicals, and the temperature-dependent ESR spectra of the spin-labels selectively reflected the segmental dynamics of the labeled chains in the blend. The ESR result showed different mobility between PCHMA and PCHA chains even though their blend showed a single glass transition in any composition by a calorimetric measurement. The WLF treatment demonstrated that a transition temperature, T5.0mT, at which the extreme separation width due to 14N anisotropic hyperfine splitting was 5.0 mT, reflected the glass transition observed at a frequency of the ESR. The T5.0mT of poly(CHMA-random-CHA) was dependent on the composition; namely, the mobility of the spin-labels was sensitive to the composition around them. The self-concentration model suggested by Lodge and McLeish [Lodge, T....
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